xr100 timing... problems!
Posted January 05, 2008 - 10:24 PM
so heres the problem..
the timing is right on the cam and everything... but the timing marks are off from what they are supposed to be on the crank.. seems like nothings matching up right..anyone have this problem before and know how to time it right?
blew out a perfectly brand new intake valve trying to set the timing..i dont feel like waiting ANOTHER week for a 3rd valve and another month and a half waiting to ride please help!
Posted January 05, 2008 - 10:31 PM
Another possibilty is the crank gear is on wrong. It is pressed on without a key but I don't think it could be off enough to bend a valve.
By the way, some guys run without the key. The taper is enough to hold the flywheel in place if it is assembled clean and the nut is tight. The key is there to assure the proper position of the flywheel not to keep it from turning.
Posted January 06, 2008 - 04:21 PM
Posted January 06, 2008 - 06:01 PM
And yes, the little "O" on the cam gear should be at "12 o"clock".
That what you have?
Posted January 07, 2008 - 07:54 AM
Posted January 07, 2008 - 01:49 PM
Posted January 07, 2008 - 02:15 PM
For valve timing the only issue is the piston at TDC flywheel position control ignition timing.
You didn't say whether it was CDI or points.
Has this engine ever run for you?
Posted January 07, 2008 - 02:59 PM
Yes the motor ran for me.. i bought it a few months back and the guy told me the timing chain needed replacing soon..well after riding it bout 10 times it broke down on me..now im at the point of trying replacing parts and now getting the timing right on it.. after getting the motor together i got it cranked and started with all the new parts but it snap crackle and popping in higher rpms like it wasnt gettin fuel..thus tearing the carb apart and cleaned the jets..put it back together n still no luck.. it wasnt the carb, i figure do the timing.. The bike frame is a 2000 xr100r model and its showing that the motor itself is a older xr100 motor..
broke a brand new intake valve trying to time it last week so i just got my new valve in today and should be trying to tackle this problem sometime this week if i can get enough info off of here
please help in any way people!
Posted January 07, 2008 - 04:28 PM