gasket paper

[coxy]

hi all is there a specific thickness for crank and carb gaskets i am just going to use my old ones for a pattern and get some gasket paper (the old ones look  like blotting paper).cheers

[disc_valve]

Hi,

I don't think there shouild be any problems with gasket thickness on carb case, Transmssion case  or even cylinder base gaskets. The only thing you may have to do is reset the clutch lifter clearance if you fit a different thickness gasket on the transmission case joint (a thicker gasket will move the lifter away from teh clutch slightly).

The central crankcase gasket on the single cylinder bikes is slightly different, as it controls the end float of the crankshaft. There are some shims fitted as standard on the crankshaft - normally two each side. What I've done with my rebuillds is to do a dry assembly of the cases with the new gasket and  just the crank in place with itrs original shims. Tighten the screws around the crank chamber. tap each end of the crank with a mallet to seat it and then try to rotate it by hand. 

If the crank feels slightly stiff, open the case, remove one of the shims and try again.

If the crank feels free on first assembly, I raid my spares box and add another standard shim and see if the crank is still free. Keep trying that until the crank feels stiff, and then remove one shim.

Basically,  the crank end float should be just less than one shim thickness.

Hope that helps!

Graham Weeks

[coxy]

thanks graham that helps a lot cheers.

[disc_valve]

Hi, again,

I've checked in the Clymer manual, and they state the crank end float on the BS90, BS50Sp and BS60Sp engines should be 0.010" - 0.015", if you have facilities to measure it - otherwise stick to the shim swapping method.

Graham W

[coxy]

thanks graham my gasket paper is 0.020 i didn't do a very good job . i now have new some gaskets .i will try making gaskets again by over spraying the old gaskets and cutting out the over spray  and make a clicking knife basically a old hacksaw blade shaped to a crescent and razor sharp   and some new hole punches and cut them out on a butchers block with out beer this time . thanks for your help cheers.