750 primary tensioner bolt copper washer size?

angonemoto

angonemoto

Hero member
Location
Chicago, USA
Hi all,
I keep trying but can't stop both my 750s from leaking at that bolt when I ride them long and kinda hard. I wonder if anyone can tell me ID, OD and thickness for the 750 GT and the 750 SF2 series. I got 10.3x16 on there now, I didn't measure the thickness tho and also didn't crank on the ones that meets the case like a gorilla either.
 
They harden with age. Heat them to cherry red then quench them in water.
This anneals them and makes them softer and hence seal better.
 
ah, that's what Mr Potter told me and I think others on the forum as well. I thought I had it licked by replacing the steel ones but now I see what you mean. This is something that needs to be repeated over time! Now I understand why the bottom fork seals on my R100S failed.

Sounds like I'll be investing in a good torch. So the size isn't key to stopping the leak, just the softened annealed copper metal seating up into the gaps. I get it now. Thanks.
 
helicopterjim said:
A simple propane torch will do just fine!
Click to expand...
the kitchen stove is even cheaper (gas is best)  :D  I have also had an SF engine leak continuously from this area and it turned out to be a porosity issue - never quite traced the exact location and the application of an internal epoxy sealant to obvious pores didn't work. Now it's the owner's prob.
 
Well, now it's time for me to completely clean the bottom of the engine cases to trace the source of the leak, as I have more on the newspaper under the bike again tonight. Stay tuned.
 
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