2002 Yamaha YZ 426 F - Answered Questions & Fixed issues

change the seal behind the water pump impeller
the shifter shaft seal will stop leaking
if it continues to mix water and oil you will have to change the head gasket

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

its either on the lever or the cable !

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.

The following information may be of assistance.http://www.off-road.gr/article64.htmlIf not, I am sure this will be. http://tinyurl.com/9vkc6sb

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.

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

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

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

your motorcycle is wet type clutch so you don't have to worry and it is installed at the right side of the motorcycle the left side is the magneto with the coil.

The trouble is in the carburator, you have 3 jets, 1 for starting, the other is use at the first 25% of your throttlr handlle and the other is a fuff full throttle jets. so, clean your carb very correctly and dont forget to remouve! the obtruction in your jets :)

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.

Sometimes there will be a physical number cast into the side of the cylinder head.

some fasteners have become loose and need to be torqued again--get a cycle book for that model to view crankcase

Hi there, You have defective head on engine. It could be broken seal and cracked head. Regards,

Hi Mr. Adam, You have defective head on engine. It could be broken seal and cracked head. Regards,

Hi,You have defective head on engine. It could be broken seal and cracked head.Regards,

If you like spending money, change it. The oil should be changed every 3000 miles.

Slightly warm the engine remove oil filler cap remove sump drain bolt and allow to drain
remove oil filter cover and remove oil filter wipe out excess oil with clean rag
install new filter and bolt on cover install sump drain plug
refill with 1100ml oil of your choice - Your Done!
Additionally you can remove the oil strainer basket from the frame but no one does this too often if at all
regards Jamie

Yamaha use the 10th digit of the VIN Number as a year code. The year codes for the 10th digit are as follows:

1971 - 1
1972 - 2
1973 = 3
1974 = 4
1975 = 5
1976 = 6
1977 = 7
1978 = 8
1979 = 9
1980 = A
1981 = B
1982 = C
1983 = D
1984= E
1985= F
1986 = G
1987 = H
1988 = J
1989 = K
1990 = L
1991 = M
1992 = N
1993 = P
1994 = R
1995 = S
1996 = T
1997 = V
1998 = W
1999 = X
2000 = Y
2001 = 1
2002 = 2
2003 = 3
2004 = 4
2005 = 5
2006 = 6
2007 = 7
2008 = 8
2009 = 9
2010 = A
2011 = B