Yamaha Motorcycles - Recent Questions, Troubleshooting & Support


Did you check/clean your air filter? I had a no start issue with my Yamaha RD350 where the filter box was tight up against the seat and no air was getting into the carb. Do you have compression? Is the cylinder still attached by the connecting rod? Have you recently made any changes (like new jets) or repairs to cylinder or rings?
usually it comes down to an air intake issue if you have a working cylinder in a motor with gas and spark unless your timing is so far off that it isn't firing during the compression. But it might still backfire if it's off?

Yamaha... | Answered 3 days ago


The gear cogs might have moved or damaged. Better get a repairman to have a look at it.

Yamaha... | Answered on Dec 04, 2019


I always add about 10% oil to my small engines to help protect them from friction. If it starts ok with that much oil, it might smoke a bit and cause a little carbon build up on the plugs or valves, but most engines after 1980 are high enough heat and compression ratio to clean themselves up.
Sometimes the oil doesn't blend in all the way without some sloshing around.

Yamaha... | Answered on Dec 03, 2019


Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the links below. Good luck and have a nice day.
YZ426 won idle without choke Intake Jetting Fuel Injection
YZ426F Won Run Choke 4Strokes com
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual Page 3

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

2001 Yamaha YZ... | Answered on Nov 29, 2019


Hi, The bike has a capacity 1000 CC. The price ( used bike ) about $ 10000 / unit

2006 Yamaha... | Answered on Nov 29, 2019


Hi, Allen 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.
https://www.motorcycleforums.net/threads/v-star-650-idle-issues.48035/
https://www.youtube.com/watch?v=8QtmvhOLSLA
https://www.manualslib.com/manual/833178/Yamaha-Xvs650.html
https://www.partsfish.com/page/oem-parts-for-yamaha
https://www.manualslib.com/manual/659403/Yamaha-V-Star-Xvs650p.html

Yamaha... | Answered on Nov 29, 2019


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 Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
2004 2005 Yamaha YZF R1 Service Manual R1 Moto Data Project
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals
Yamaha R1 Performance upgrade 1
Yamaha YZF R1 02 03

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


2004 Yamaha... | Answered on Nov 29, 2019


your fuel pump suppose to Hum and gently vibrate only when working normally, clacking sound would only mean that it is having a hard time or inconsistently supplying gasoline into your engine. Have it checked and see if any improvement would happen.

2002 Yamaha V... | Answered on Nov 29, 2019


Hi, Yusuf and the usual suspects are:
1. Condensation builds up from parking a hot bike in a cold place.
2. Blown head gasket on liquid cooled engines.
3. Faulty water pump.
4. Blown base gasket.
5. Cracked cylinder or head.
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.
https://www.quora.com/Milky-oil-in-my-scooter-125cc-can-someone-find-the-problem
https://www.elf.com/en/lubricants-faq/about-lubricants/why-there-water-engine-oil
https://www.manualslib.com/manual/917772/Yamaha-Xc50v.html#product-VINO%20XC50V
https://www.partsfish.com/page/oem-parts-for-yamaha
https://www.manualslib.com/manual/558548/Yamaha-Vino-Xc50w.html#product-VINO%20XC50V

Yamaha... | Answered on Nov 22, 2019


Maybe..but the wire frim alternator to batt cud b worn out or connections bad. Alternator brushes mite need old

Yamaha... | Answered on Nov 15, 2019


Hi, Anonymous 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 of $15 and there is a handful of obscure, rare, obsolete, and very old models that are no longer or never were available and some were never printed in English. The Indian and Philippine markets are usually in E-book format only, 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.
To download your manual for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
http://biobug.org/motorcycle/xs850/Yamaha-XS70-XS850-Service-Manual.pdf
https://www.partsfish.com/page/oem-parts-for-yamaha
http://mybikemanuals.com/yamaha/
https://bikez.com/motorcycles/yamaha_xs_750_special_1981.php
https://en.wikipedia.org/wiki/Yamaha_XS750

Yamaha... | Answered on Nov 10, 2019


Hi, Chet 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 Yamaha, despair not, for a mere zero $ 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.
https://www.google.com/search?q=Wiring+diagram+1981+Yamaha+XJ750+Seca&tbm=isch&source=univ&sa=X&ved=2ahUKEwjP6Ybv8N3lAhWKv1kKHRc4DQcQsAR6BAgFEAE&biw=1440&bih=757
http://classiccycles.org/1852/597985.html
https://www.xjcd.org/book/export/html/77
https://www.partsfish.com/page/oem-parts-for-yamaha
http://mybikemanuals.com/yamaha/

Yamaha... | Answered on Nov 09, 2019


Should be around 120 to 130 at cranking should have a decompression valve that brings it down to that, running it's around 170 to 180

Yamaha... | Answered on Nov 03, 2019


Hi, Robert 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 enquiry.
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.
https://www.amazon.com/Caltric-YAMAHA-CLASSIC-XVS1100-2000-2003/dp/B0146VMK7E
https://www.amazon.com/Replacement-YAMAHA-V-STAR-CLASSIC-XVS1100/dp/B07B2LWMVV
https://www.sloneservices.com/SilverBack/Other-Stuff/V-StarShopManual99-07.pdf
https://www.partsfish.com/page/oem-parts-for-yamaha
http://www.sloneservices.com/SilverBack/Other-Stuff/V-StarOwner%20Manual.pdf

2003 Yamaha V... | Answered on Nov 01, 2019


Hi, Aron before testing any electrical component in the Turn Signal Light Circuit it is "IMPERATIVE" that you have a fully charged battery of 12.5 volts or more and be able to pass a proper "LOAD" test because your battery may have 12.5 volts or more but little or zero amps causing the battery to be faulty and must be replaced, "AGM" batteries fall into this category more so than lead-acid types, also before diagnosing any turn signal/running light/parking light issue make sure the bulb is good and the light fuse has continuity with a test light. If you have replaced your OEM lights with one or all LED lights you are going to need a load equalizer.
If no turn signals are working the cause could be a faulty turn signal module/flasher or the connector going to it, look for corroded, loose, or broken pins/sockets. Contact spray cleaner is great for removing corrosion.
If your turn signal comes on but takes several seconds before it starts flashing you may have dirty contacts in the turn signal switch/button, the switch needs to be opened up and cleaned also the flasher may be starting to fail. It should be noted that cold weather will only exacerbate the situation especially when temperatures drop down below freezing and the location of the component, turn signal switches on the handlebar are at the mercy of the oncoming freezing 70 mph wind and makes it hard for the contacts to do their job covered in frozen grease/grime
If all four turn signals flash at the same time like hazard lights even though you only pressed one turn signal button then you have a LED light in the circuit and need a load equalizer that can be purchased from any motorcycle parts supplier.
If your speedometer does not function properly it will have to be fixed first because your turn signal module gets the data from the speedometer for normal turn signal function.
If your front turn signals don't work use a test light to check for power and ground at the bulb socket, then start backtracking the wiring through every wire connector to the turn signal switch/button and check for continuity, go all the way back to the fuse if necessary to find the cause of the malfunction.
If your rear turn signals don't work check your rear fender wiring harness connector first, look for, corroded, broken, loose pins/sockets, power, and a good ground, the harness connector is usually located under the seat on the front of the rear fender then keep tracing the wiring look for obvious harness damage caused by the rear tire.
If you still can't find the malfunction backtrack from the rear fender wiring harness connector.
If one side does not work you could have a faulty turn signal switch or module check for continuity.
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.
https://www.motorcyclecruiser.com/basic-electronic-troubleshooting/
https://www.motorcyclenews.com/new-rider/choosing-kit/2011/august/aug3011-why-do-bulbs-keep-blowing-/
http://www.family-motorsports.net/GY6-50cc-150cc.pdf
https://www.partsfish.com/page/oem-parts-for-yamaha
http://www.yamaha-motor.com.my/wp-content/uploads/2019/01/BC1-Nmax-EN.pdf

Yamaha... | Answered on Nov 01, 2019


Hi, Jose 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 Yamaha, despair not, for a mere zero $ 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.
https://www.google.com/search?q=Wiring+diagram+1975+Yamaha+DT+400&tbm=isch&source=univ&sa=X&ved=2ahUKEwjezcXm-cTlAhWSuVkKHW2ZDfsQsAR6BAgJEAE&biw=1440&bih=757
https://yamaha-enduros.com/index.php/forum/74-76-twin-shock/1232-1975-dt400-wiring
http://classiccycles.org/1852/597985.html
https://www.manualslib.com/manual/999370/Yamaha-Dt250d.html
https://www.partsfish.com/page/oem-parts-for-yamaha
http://mybikemanuals.com/yamaha/

Yamaha... | Answered on Oct 30, 2019

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