Eng valve adj specs
The 2003 Yamaha YZ450F is a big-bore, air-cooled two-stroke motorcycle. It was first introduced in 2001 and was the replacement for the 2000 model year YZ450F. The engine displacement has remained at 450cc since then. It uses an overhead camshaft with four valves per cylinder and a 4 valve/cylinder head configuration to create power output of 35 PS (29 kW) @ 8500 rpm and 25 lb·ft (35 Nm) @ 7200 rpm with a compression ratio of 9.7:1.
SOURCE: i purchased a imported yamaha yz450f need to find
VIN numbers are usually 17 digits long so it appears you are missing some numbers/letters. If you find the full 17 numbers, enter them into this website and it should tell you all you want to know.
http://www.motoverse.com/tools/vin/yamaha.asp
Good luck
SOURCE: what are the Valve clearances for a 2004 yamaha yz450f
Valve clearance (cold):
Intake:
0.10 ~ 0.15 mm (0.0039 ~ 0.0059 in.)
Exhaust:
0.20 ~ 0.25 mm (0.0079 ~ 0.0098 in.)
SOURCE: 2003 yamaha 250yfm valves are noisey and started
Valves are adjusted by changing the the shims to thicker or thiner ones.
measure all the clearances and write them down, remove the cams and remove the cam buckets of the ones that need adjustment. Note the sizes of the shims removed( it is etched onto them) and replace with different thickness shims to bring them back into tollerence.
Make some marks and notes on the cam timing before removing cams,even take a photo(or that will be your next question) .
valve clearances usually close up( dont get noisy) and valve clearances wont make it smoke, so there may be more maintenance to do, like a cam chain and rings. Im not certain about a yfm, but you posted with a picture of a 2 stroke which doesnt have valves to adjust
SOURCE: 2003 Yamaha TT-R 125 L valve clearance
valve lash on the intake .003 to .005 inch, .08 to .12 mm,exhaust .004"to.0055 inch,.10 to .14 mm (cold engine).
SOURCE: My 2003 yamaha yz450f will back fire the whole
there may be a problem with the exhaust valves first check and adjust the clearances,
another reason can be leaking inlet or exhaust gaskets
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