How to remove timing chain from YZ250F car?
Take the tension off of the timing chain remove the caps off of the exhaust, and intake cams, remove the intake cam 1st while taking the timing chain off by rolling the intake cam towards the front of the motor till you have enough slack in the chain to remove the cam. Next remove the exhaust cam and chain.
What happens when the timing chain is off on a Moto?
Cam timings that are off several degrees will result in a loss of power and the cam chain tensioner will have quite a job trying to take slack out of the valvetrain. When a timing chain elongates it may not do so in a uniform way and parts of the chain may be tighter or looser than others.
How to check timing on YZ250F compression stroke?
Put the crank at TDC on compression stroke WITH the CCT installed then check the dots on the camshaft are lined up (they may not be exact but should be within 1/2 tooth).
What should cam caps torque be on YZ250F?
Install the cam caps torque to 10 nm this is very important. release the cam tensioner and everything should be correct. Rotate the crank with a wrench several times to verify everything is correct. You should be turning the crank counter-clockwise. This is the normal rotation of engine, and it will put the slack in the chain on the tensioner side.
Where are the timing marks on a YZ250F?
Timing marks must be spot on at the crank and the cam sprockets, when the cam chain tensioner is ingaged. Alright, thanks. This is new to me, so how would I go about re-setting the timing? Is a timing light needed? I will read up on it in the manual as well. Remove the cam chain tensioner per the manual. Get the crank at TDC per the marks.
Install the cam caps torque to 10 nm this is very important. release the cam tensioner and everything should be correct. Rotate the crank with a wrench several times to verify everything is correct. You should be turning the crank counter-clockwise. This is the normal rotation of engine, and it will put the slack in the chain on the tensioner side.
How to check the valves on a 2009 YZ250F?
So I’m checking the valves on my 2009 YZ250F today. Everything was going smoothly until I went to set everything at TDC. I lined up the dots on the cam sprockets level with the head and made sure the cams were pointing out.
Can a cam chain have stretched after 25 hours?
There is no way a cam chain will have stretched after 25 hours of use “the resistance slowly builds up then realeases abruptly, spinning the socket back clockwise a bit. Is this normal? ”