20 Most Recent 2008 Yamaha yZ250 Questions & Answers

Sounds like you may have bad oil control rings or leaking valve guides. Check too make sure your oil is not overfull as that would cause the problem also. Otherwise you may need mechanical work on the engine.

Replace the spark plug to new one they rarely come good or be reliable once fouled shouldn't need to clean carb but if were mine I would clean it anyway
regards Jamie

When you open and close the throttle can you hear the slide hitting the throttle stop?have you removed the slide, and fitted it in the reverse order, this would restrict full opperation of the slide leaving it in the part open position, the cut out side of the slide faces rearmost away from the engine, if you have exsess play in the cable at the carb, it is poss you may have fitted it wrong, unscrew the tickover screw almost all the way until you no longer hear the slide hitting it on throttle closure, start the bike you may have to hold the throttle at the desired revs, whilst doing this screw in the tickover screw until it just increases the tickover, you can now release the twist grip and addjust the idle to suite

Hi, Thats a 1978 Yamaha YZ250E engine. Cheers Barry

See your dealer, they'll know exactly what you need and probably be able to sell it/order it for you

It's likely low on compression. When was the last time it had a top end? Start with a clean air filter, clean carb, clean fuel, reeds in good shape, new spark plug and a good top end and it will fire right up and promptly throw you off the back! Good luck.

Need more info on this one - how long do you get before it dies or is it dieing fist few minutes does restart again once engine cold (ie next day) is it regular does it do this every ride or has just happened couple of times lately is it running well then dies or is progressively running bad then stops

Try this VN decoder site. http://www.motoverse.com/tools/vin/yamaha.asp

This is a highly ill - eagle act to do. In the old days we would put an electric drill on the drive cable, but now they make them tamper proof so they only go one way. The bezels are crimped on so you can't get inside them. I expect modern one may be electronic. How will your insurance company know what mileage you have done? I have never known an insurance cancel or fine due to mileage. You should have just disconnected it when you got close to the limit. Buy a used one and use them for 6 months in turns. There are two or three here 23K and one with 36k https://www.google.com/search?q=2002+yamaha+sr125+speedometer ..

Not mentioned in the Service manual http://www.badrad600.com/Yamaha_Radian_Factory_Service_Manual_OCR.pdf https://www.google.com/search?q=1986+Yamaha+YX600+Radian+remove+USA+speed+restriction Something like this?

Removing 95bhp restriction ' Yamaha Star Cycle V-Max ...

vmaxforum.net https://www.vmaxforum.net > threads > removing-95bh... Jan 14, 2013 - Air jets could easily become blocked. Step 3: Removing the speed restriction. On the back of the speedo-needle a disc with two different . ..

Check the diagrams here https://www.google.com/search?q=yamaha+sega+81+firing+order ..

Question edited for a lot more clarity, add maker. Question moved to Yamaha Motorcycle. Unlikely to be a carburetor problem as this appears to be fuel injected! https://www.google.com/search?q=Yamaha+Mio+125+MX+no+start ..

Make sure the fuel is getting to the valve and passing through it. Possible blockage in fuel line or in the tank.

It isn't called a Magneto, that was for really old bikes. It is a 'stator'. Service manual https://drive.google.com/drive/folders/1OFbBW2YhLpL1-Xbsw9vexi84Y7aXGTdG Parts List https://www.cmsnl.com/yamaha-rt100-1990-l-usa_model9624/partslist/ https://www.google.com/search?q=1990+yamaha+rt100+wiring+diagram ..

First make sure that the new battery has been fully charged and is not defective. Next make sure that the proper voltage is reaching the started. You may have a bad post connection or loose connection at the starter. Try jumping you battery with another known good battery.

Above the master cylinder on each brake.

Your Service Manual is here

service-manual-yzf-r15.pdf

Ridertua https://ridertua.files.wordpress.com > 2011/04 > se... To help identify parts and clarify procedure steps, there are exploded diagrams "3" at the start of each removal and disassembly section. • Numbers "4" are ... 338 pages ..

What Exactly does the bike do when it 'loses power'? This will give clues as to where the issue could be. When was the last time the bike was given a major service? Sometimes it can be as simple as a dirty fuel/air filter or an old/worn or dirty spark plug.