Question about 2004 Yamaha YZ 450 F
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07 YZ450F Cam Chain Install YZ 400 426 450
How to change timing chain and set timing on YZ450f
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha
Posted on Aug 09, 2016
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Posted on Jan 02, 2017
mate i would grab stuff off the wr lights blinkers and all that i would change that motocross suspention before ya get on the road if ya want
Posted on Aug 10, 2009
Most motorcycle cam gears have a mark on one tooth, often just a punch mark, sometimes an "o". Usually this mark should be "straight up" in line with the cylinder when the engine is at top dead center on the compression stroke. Double-check your service manual to be sure for a particular bike.
So here's how you set it. Remove the flywheel cover and rotate the engine so that the piston is at top dead center. There should be a "TDC" or "T" mark on the flywheel, and some sort of corresponding mark or pointer on the engine case to line this up with. To make sure, remove the spark plug and verify with a flashlight that the piston is as high as it can be when the marks are lined up.
Now rotate the cam gear until the punch or "o" mark is at the very top of the engine (in line with the cylinder, if the cylinder is slanted). At this point, neither the intake nor the exhaust valves should be open.
Now connect the cam chain while both the crankshaft and the cam gear are in these reference positions, and you are done!
Posted on Nov 06, 2009
hi,if it is anything like the 400r,the tensioner will be automatic and non adjustable,normally the chain guides wear out before the adjuster reaches it outer limit,they are quite esay to replace but you need to take the cams out to do it,you will probably find that a lot of the noise coming from the motor is the clutch basket,as a matter of course they are quite noisy once you start to get a few km on the bike...cheers
Posted on Mar 21, 2010
SOURCE: ive got a 2006 yz450f
With setting the cams it can only be right or wrong there is not really any way to be a little out unless the cam chain itself is severely over stretched...
set (I) mark on fly wheel to be visible within the marks on the inspection hole of ignition cover (always a good idea to cross reference TDC by probing the piston through spark plug hole as I have seen many flywheels shear their woodruff keys and give incorrect TDC readings) any how, once at TDC set the cams ( lobes facing outwards with the dots on each cam aligning best you can with the head. with your finger take out the slack of the cam chain through the tensioner hole and double check all dots and (I) mark on fly wheel still all line up correctly - if so then your good to button all back up... Don't be alarmed if takes a few goes it's perfectly normal to have at least couple of attempts to get all correct.
You want your valve clearances to be 0.20 on the exhaust and 0.10 on the intake side a tiny amount bigger gap is kind of OK but never smaller or you will do damage !
Backfire although can be caused by timing out or valves clearance incorrect in my experience is nearly always due to lean on fuel, could be worth double checking your pilot jet and circuit is all clear - compressed air cleaning them is best or stick new pilot jet in to be fool proof ! and air clean the hole the pilot jet screws into..
Happy to elaborate on any points if needs be, just let me know
good luck regards Jamie
Posted on Sep 13, 2011
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