Cam and top end question
Posted June 08, 2005 - 12:27 PM
When I tear the motor apart at TDC and then replace the cams, piston and new barrel, how do I know if the bike is at true TDC without the cams in the bike? Do I just have to make 100% certain that the entire time I have the motor apart the crank does not move at all?
Do our bikes fire both on power and exhaust stroke?
Posted June 08, 2005 - 12:50 PM
Posted June 08, 2005 - 01:09 PM
Posted June 09, 2005 - 05:41 AM
Posted June 09, 2005 - 06:33 AM
Posted June 09, 2005 - 06:50 AM
Posted June 09, 2005 - 07:15 AM
Posted June 09, 2005 - 11:04 AM
Posted June 09, 2005 - 12:41 PM
Bottow line______________Do our yammy's fire every time the piston comes to the TDC?????
Without actually checking it, I would say YES.
Posted June 09, 2005 - 02:10 PM
Posted June 09, 2005 - 03:32 PM
The fact is though that WR's trigger from the crank not the cams so YES it does fire on every stroke. The fire on the compression stroke is the only one that does anything, you would never even know that it was firing on the exhaust stroke as well but it does. As long as you can see the flywheel marks in the sight window when you line up the cams your good to go.
Posted June 09, 2005 - 03:37 PM
Is the ignition set up on our bikes so that the plug fires at both TDCs????????
I know that a 4-stk only needs to fire once a cycle, 720 degrees of the crank. But on many modern motors these days the plug fires every 360 degrees because the ignition pulls a signal directly off of the crank.
If the plug on our bikes only fires every 720 degrees, when re-assembling my motor how can I determine the correct TDC (TDC when plug fires) to index my cams with if the head has been removed and the angular location of the crank is unknown?
I can find a TDC using the spyholes but how do I know if that TDC is the true TDC just before the power stroke?
If the plug fires every 360 degrees then I can just index my cams to either TDC.
Luke_n - you answered the million dollar question!!!!! Thank you so much!!!!!
Posted June 10, 2005 - 05:06 AM
Posted June 10, 2005 - 05:56 AM
Posted June 10, 2005 - 11:19 AM