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more valves and shims ?

  • Thread starter Thread starter maddoghoek
  • Start date Start date
M

maddoghoek

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this may be a dum question, im kinda new to wrenchin on this old bike 1977 gs750, but ive pulled the 4 outer shims and the 2 right side ones are marked 2.80, the left intake is a 2.85, left exhaust is 2.75, is this abnormal? keep in mind i dont really know the history of maintenance, rebuilds valve jobs ect
 
I hope when you pulled them you put some thing back in there places before you turned the motor, as cam damage can and will occur
No that would be normal to have various different sizes
 
It sounds normal to me, I suspect the valves have not been checked in a while or possibly ever since they in the top of the range. I have a kit and the largest shim is I believe 3.00. How are the clearances?

I would recommend getting a metric feeler guage with even increments .03, 04 etc so you can see exactly what you have. It is also better to be at the top of the clearance range than close to the minimums.
 
No, it sounds pretty normal. However the shim may not be the size marked on it because of wear or because a previous owner ground them to a smaller size. Best check the actual thickness when you do the shim inventory.
 
ok the smallest feeler i have on hand is a .04mm and it wont slide in, i just wanted to make sure somthing screwy goin on there thanx
 
Get Steve's spread sheet, and a much smaller shim

Use the small shim to confirm how much clearance is needed for every valve you can't get the feeler guage under

If you have to change more than 4 down, you should do a compression check after the shims are changed

You don't want to end up like the 2 burnt valves guy over in 4 cylinder
 
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