Derbi Motorcycles - Recent Questions, Troubleshooting & Support


Hi, Josh and the usual suspects are:
1. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, stator, magneto, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Faulty neutral, side stand or clutch lever safety switch.
10. Faulty or corroded kill switch.
11. Accelerator pump damaged or not working.
12. Water or dirt in the fuel system, carburetor or filter.
13. Restricted, blocked or kinked fuel line.
14. Fuel tank empty.
15. The gas cap is not venting properly or fuel tank venting system blocked, loosen gas cap and go for a test ride.
16. A failed fuel pump, pressure regulator and or fuel injectors.
17. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
18. Needle and seat stuck closed in the float bowl.
19. Petcock clogged or damaged.
20. Lean angle switch is faulty or needs adjustment.
21. Catastrophic engine failure, perform a compression test.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Derbi Senda 50cc wont start has fuel spark compression https://www.scootershack.co.uk/threads/derbi-senda-50-running-issues.37368 https://scootergrisen.dk/scooterhjemmeside/download/derbi_50cc_6speed_servicemanual.pdf https://www.oemmotorparts.com/oem2.asp?M=derbi Derbi SENDA SM DRD PRO 50 Owner Manual

2010 Derbi Senda... | Answered on Nov 04, 2018


Hi, Anonymous for more information about your question and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
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2007 Derbi... | Answered on Oct 10, 2018


cycle oil..30wt..or car

Derbi... | Answered on Jul 08, 2018


Hi, Edward for this scenario you will need your service manual that has all fastener torque specs and a wiring diagram on the back pages, parts fiche, and owners manual if you can't find the best tool you ever bought for your Derbi, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
2010 Derbi Senda DRD Evo 50 SM fuse box location Google Search
Maintenance battery and fuse
Please Check First
https://www.oemmotorparts.com/oem2.asp?M=derbi
Derbi SENDA SM DRD PRO 50 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


2010 Derbi Senda... | Answered on Jun 26, 2018


Hi, Edward for this scenario you will need your service manual that has all fastener torque specs and a wiring diagram on the back pages, parts fiche, and owners manual if you can't find the best tool you ever bought for your Derbi, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
2010 Derbi Senda DRD Pro 50 SM main fuse location Google Search
Battery and fuse 2 Quicker and Brighter
https://scootergrisen.dk/scooterhjemmeside/download/derbi_50cc_6speed_servicemanual.pdf
http://oem-parts.hu/en/parts/derbi/senda-50-sm
Derbi SENDA SM DRD PRO 50 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


2010 Derbi Senda... | Answered on Apr 24, 2018


Hi, Braeden for this scenario you will need your service manual, parts fiche, and owners manual if you can't find the best tool you ever bought for your Derbi, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
GPR125 SC125 FAQs
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Derbi GPR125 Workshop Manual
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Derbi GPR 50 2009 Owner Handbook Manual

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2005 Derbi GPR... | Answered on Feb 20, 2018


Hi, Asteris for more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Derbi GPR 50 Regulators eBay $27
regulator rectifier for Derbi Senda GPR Aprilia RX SX 50 Gilera RCR... $23
https://scootergrisen.dk/scooterhjemmeside/download/derbi_50cc_6speed_servicemanual.pdf
http://oem-parts.hu/en/parts/derbi/gpr-50
Derbi GPR 50 2009 Owner Handbook Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

2008 Derbi GPR... | Answered on Nov 30, 2017


Hi, Stephen you need to make sure you have no intake leaks by spraying some Brake Kleen, Contact Cleaner, Starting Fluid etc. around the intake manifold and seals, if the RPM's go up or down significantly then you have a leak that needs to be fixed before you can continue with the carburetor adjustment.
The engine should be at operating temperature with the choke off to set the idle between 950-1050 rpm. Turn the idle skrew clockwise to increase the idle speed and counterclockwise to decrease the idle speed. If you have access to your air-fuel mixture skrew you may turn it as well, if not there is a video below on how to gain access, make sure you start with clean or new spark plugs. Gently turn the air-fuel mixture skrew clockwise until it starts to bottom out "STOP" do not over tighten as it will damage the taper on the end, now back the skrew out 1-1/2 full turns to establish a starting point start the engine and check the idle rpm's and turn the idle skrew accordingly for 950-1050 rpm if necessary, turn the air-fuel mixture skrew 1/4 turn at a time and let the engine settle for about 10 seconds, turn the skrew clockwise for a leaner mixture and counterclockwise for a richer mixture, you are seeking the highest rpm your air-fuel mixture skrew can acquire without going past 3 full turns from bottom then resetting the idle skrew back down to 950-1050 rpm If you can not detect any rpm change and can not stall the engine by turning the air-fuel mixture skrew all the way in then your pilot/low-speed jet is too big and needs to be replaced with the next size smaller. Final adjustment should be made with a clean air filter mounted to the carburetor.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
How to adjust check idle speed Derbi Senda Cross City 125
Derbi SENDA SM 125 4T Baja Manual
Genuine Derbi motorcycle parts spares Fowlers Parts
http://www.debonairng.com/derbi_terra_owners_manual_download.pdf
https://www.ultimatespecs.com/motorcycles-specs/derbi/derbi-terra-125-2011

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


2011 Derbi Terra... | Answered on Nov 15, 2017


If you can get it out of the tank, buy a blank of the same, clamp them together & gently file the new key.

2011 Derbi Cross... | Answered on Nov 05, 2017


Hi, Anonymous and the usual suspects are:
1. Idle speed improperly adjusted.
2. Inlet system air leak.
3. Damaged or restricted fuel tank venting system.
4. Dirty or damaged air cleaner element.
5. The accelerator pump is inoperative.
6. Vacuum piston assembly malfunction.
7. The choke valve is not seated or leaking.
8. Restricted fuel supply tract.
9. Plugged bowl vent.
10. Loose or plugged fuel and air jets or passages.
11. Improper float level.
12. Worn or damaged needle or needle jet.
13. Loose or plugged main jets or passages.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Derbi Cross City Review and MPG
DERBI SENDA CUTTING OUT
Derbi GP1 125 250 Workshop Manual
Genuine Derbi motorcycle parts spares Fowlers Parts
DERBI CROSS CITY 125 2007 on Review

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2009 Derbi Cross... | Answered on Oct 20, 2017


Hi, Marshal if your bike has been sitting idle for months or years and you did not do any pre-storage maintenance I feel your pain it will probably have a dead battery and not want to start or if it starts it will not idle unless the choke is full on and run poorly then stall, here are the following steps necessary to complete in order to get your bike back to an acceptable running condition and in the future pour in a bottle of fuel stabilizer and injector cleaner for you FI folks at least 2 times a year and before storage.
1. If your battery was 2-3 years old when you last had the bike running you should replace it.
2. If you believe your battery might still be serviceable remove it from the bike and put it on a 1 or 2 amp trickle charger for 24 hours. If it is the old lead acid type with visible cells and acid levels fill each cell to the top line with distilled water and replace the caps, run the vent tube into a plastic or styrofoam cup, any cells that are cloudy/milky replace the battery.
3. After charging the battery remove the leads and let it sit for a couple of hours then check the battery voltage with a voltmeter, you should have 12.5 volts or more, any readings in the 11 volt range you need to do a proper "LOAD" test on the battery and replace as necessary, you may have 12.5 volts or better but little or zero amps, any readings in the 10 volt range you have a dead cell and the battery needs to be replaced.
4. Drain and flush fuel tank if it rusty there is a cheap and easy fix. https://www.youtube.com/watch?v=fUYr_7SwGms
5. Remove and inspect your air cleaner paper elements that are not oil soaked can be cleaned with a soft brush and low pressure compressed air, oil-soaked elements must be replaced. Gause mesh and foam elements can be cleaned by soaking them in a container big enough to completely cover them with a solution of 1 gallon of water and 1 oz. of Dawn dishwashing liquid for small and medium size elements, for monster size double the formula and let soak for at least one hour then rinse with warm water shake off excess and let air dry, "WARNING" do not use compressed air as this will embed micro-sized dirt and road grime and destroy the mesh pattern and stretch foam elements out of shape just squeeze it like a sponge and let air dry, use a fan if you're in a hurry. When completely dry spray a very fine mist of air filter oil evenly around the whole element.
6. Remove the carburetors, disassemble and decontaminate with a "CARB DIP" or if you have EFI remove injectors and clean with carb spray and compressed air
7. Check intake manifold and seals for leaks and craks.
8. Remove fuel valve and filter disassemble and clean as necessary, remove, clean, and inspect fuel and vacuum lines and replace as necessary.
9. Replace spark plugs with new ones and check for spark.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Scooter Troubleshooting Scooter won start All about Scooters
Scooter won start
http://www.social-medianer.com/2003/2003-derbi-manual.pdf
Derbi ATLANTIS O2 RED BULLET 50 cc 2003 Parts
http://absolutelyscooterparts.net/pdf/CGEN_dawg_scooter_manual.pdf

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Derbi... | Answered on Oct 05, 2017


Hi, Luke the answer to this question is way above my pay grade for this situation, I would call or visit my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
2001 Derbi Motorcycles Prices and Model List
2001 Derbi Manhattan Price
2001 Derbi Motorcycle Photos and Specs
Question about how much 2001 Derbi GPR 50 is worth
Derbi Wikipedia

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Derbi... | Answered on Sep 22, 2017


Hi, Ger the vast majority of service, parts fiche, and owners manuals on the internet are "FREE" to download and all service manuals contain wiring diagrams in the back pages. The rest usually charge a modest fee around $10 and there is a handful of obscure, rare, obsolete, and very old models that are no longer or never were available, for these rare occasions I shall look on eBay and find the cheapest one available. Most of the manuals will cover your exact make, model, and year otherwise one will be provided that comes as close as possible to your bike and will have most of the same info that an exact manual would have. If there is no $ sign after the manual link it is free to download for viewing or printing. To download your manual please click on the blue links below. Good luck and have a wonderful day
https://www.download-geek.com/download/Manual%20Derbi%20Cross%20City%20125.html?aff.id=8890&aff.subid=1
Purchase Derbi CROSS CITY 2007 2012 motorcycle parts online
http://lastmanuals.com/manual/DERBI/CROSS-CITY-125
Derbi Cross City 125 2007
Derbi Wikipedia

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

2007 Derbi Cross... | Answered on Sep 14, 2017


Hi, Ambikaipahan I would really love to help you with your bike question but due to the magnitude of yesterday's solar flare the batteries in my crystal ball are dead and my mental telepathy headset circuitry was melted. I need the year and model of your motorcycle please click on the word "COMMENT" below and provide this information in the box that will open and then click on the green comment box in the bottom right-hand corner after it posts I will receive an "ALERT" icon that will allow me to respond to your information. Good luck and have a wonderful day.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Derbi... | Answered on Jul 19, 2017


Hi, Linda could not find anything remotely close my advice is to Google the word Derbi Motorcycles then add your zip code or city you live in for the closest Dealer or repair shop and go from there.
Good luck and have a wonderful day. Gregg

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Derbi... | Answered on Jun 02, 2017


Hi, Linda this was a tough one could not find anything on a Cross City only an owners manual on a Senda which is a cousin for more information about your question and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Derbi SENDA SM 125 4T Baja Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Derbi... | Answered on May 27, 2017


Hi, Anonymous if you have changed your fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" your not getting enough fuel.
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Carburator Theory and Tuning
My tuning Derbi DRD PRO SM 50
https://scootergrisen.dk/scooterhjemmeside/download/derbi_50cc_6speed_servicemanual.pdf
https://www.oemmotorparts.com/oem2.asp?M=derbi
Derbi SENDA SM DRD PRO 50 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Derbi... | Answered on May 14, 2017


Hi, WF1978 replace the speedometer drive unit in the front wheel. Good luck and have a wonderful day.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Derbi Cross city... | Answered on May 01, 2017


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Derbi, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Derbi GPR125 Workshop Manual
https://www.oemmotorparts.com/oem2.asp?M=derbi
Derbi Technical Training 2010 125 4T 4V
Derbi Mulhacen 125 2010
Derbi Wikipedia

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Derbi... | Answered on Apr 29, 2017


Hi, WF1978 the answer to this question is way above my pay grade and for this situation, I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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http://lastmanuals.com/manual/DERBI/CROSS-CITY-125

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Derbi Cross city... | Answered on Apr 28, 2017

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