Posted May 21, 2005 - 06:24 PM
should I adjust the cams to line up?
Posted May 21, 2005 - 06:57 PM
The reason I am suspect is it seems to run ok, but it has a ping( vibration) when I accelarate hard after lugging the engine a little bit when I am cruising down the road.
Thanks for any input about this
Posted May 21, 2005 - 07:44 PM
1st thing I'd do is verify TDC is correct. Unless you have a degree wheel and piston stop, use the long CLEAN screwdriver down the spark plug hole trick. Always leave the engine at TDC when doing timing. Sounds like you are 1 or maybe 2 teeth retarded on both cams. Only other possibility is that the chain is severly stretched. Check how far in the tensioner is. If it's much past 1/2 way you may have a chain issue.
As the timing chain stretches (normal wear and tear) , the exhaust dot will be higher above the head surface and the inlet dot will be below the head surface. (by 1/2 tooth less)
Posted May 21, 2005 - 08:04 PM
Posted May 21, 2005 - 10:21 PM
the easier way to do it is to remove the tensioner, then take a CLEAN screwdriver and press it in the hole where the tensioner came from until the chain is firm. Then, using a nikko pen mark the shaft of the screwdriver where it is level with the tensioner gasket surface on the barrel. You can mow sit the screwdriver beside the tensioner to see hoiw far the tensioner is extended when it's in the engine. Unfortunately, Yamaha dont give specs for a 20 link lengths of chain like other makes do, so this is the only way to guage chain stretch.
When checking the tensioner, do you hold the tensioner with a screw driver as you unbolt is?
Posted May 21, 2005 - 11:22 PM
Posted May 21, 2005 - 11:46 PM
Posted May 22, 2005 - 06:16 PM
Also, checked the tension of the chain, maybe 1/3 of the throw of the tensioner is being used.
I'll chaulk this up to inexperience and a being a little to critical.
thanks for the input guys.
Posted May 23, 2005 - 01:10 AM
Posted May 23, 2005 - 01:28 AM