Yamaha YZ 426 F - Popular Questions, Answers, Tips & Manuals

On this model you measure oil height with the fork compressed and spring removed. Pour 5 weightfork oil in until itis 90 mm from the top. lift and lower the damper rod inside the tube a couple times and recheck your oil level.

2 1/2 quarts

yes the bowl cant fill to shut off feed line

Hi i have a 2001 yzf 426 i got it with 3 bent valves so i replaced them and the pistion rings but still no compression but think my timing is right

Time for a valve adjustment. You have done the right thing by replacing the spark plug and cleaning the carb. Check your valve cleareance and make sure is up to specs.

its either on the lever or the cable !

Hi there,Have you checked your accelerator pump daiphram ? Could be old and needs replacing or dirty.

Some 426's have a decompression lever and some don't if there is been a cam job done.

clean plug .. although new plug if old fuel or unbalanced carb it may quickly foul. if this works you may need help to work out whats causing plug to foul.

minha yz426f quando vou de terceira marcha devagar mas quando eu acelero a fundo ela engasga , mas ? so de terceira marcha de rewsto nao faz isso

Drain some out ... when it is over full, the crank shaft whips it full of air and as such, it is not able to lubricate the engine NOR the transmission. Best bet is to drain it all and refill to proper level.

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2 to 3 clicks. Make sure you fire the bike up a couple of times to make sure is running good.

check fork oil if thats not it might have to buy new forks

It is not normal, The oil is coming from the engine lubrication system and it sounds as if you have not renewed the rocker cover gasket when the engine was rebuilt. Check the torque settings on the head bolts and that no oil is getting into the coolant.

did the guy give you the starting method. if not you have flooded the plug and it will only start if you replace the plug or dry it out.method. dont touch the throttle. pull decom lever and kick over 10 times.release lever get topwith kick start. pull decom lever slightly to allow kick start to drop 1 notch. release lever and let kick start back up and kick hard.repeat should start second go.

thats top end work--so u need a repair book and rite tools--u sure its the gasket-was compression chec done

there should be an engine number and frame number on your bike which will identify your bike. the engine no is usualy stamped on the bottom engine casing (usualy left hand side). the frame no. should be on the frame just behind the forks. the numbers should both be present and should be the same, not sure how to use this number but take this to your local bike mechanic and he should be able to help you. i had to do this when my mate bought a ty175, wich turned out to be a 1980 dt175!!

If the machine is not being used there is no need to change either the engine or fork oilWhen left in cold conditions some condensation may occur in the engine & forks & the resulting water can affect the oils If there is water in oil it will get churned into a white froth or the oil will go opaqueRide Safe

The setting of the ignition is too ADVANCED and so there is PREIGNITION. Perhaps this is done to have the engine respond well into higer RPM and so if there was backfiring only when the start was missed , I would suggest that you try out to start and if not you must get the bike tuned once again for fuel settings and ignition setttings including timing.