How tight for MKII Primary cover?

pete.v · Apr 13, 2012

Johnnymac said:
I have a slow leak on my Combat. (Not a surprise eh?) As soon as the engine gets warm, I get oil that slowly seeps out the primary cover and on to the header. How tight should the primary cover bolt be? I don't want to tighten it too much and have it crack... or does it stop when it's fully tightened? Thanks.

Is the best gasket for the primary cover the one from Old Brits? or is there an aftermarket one elsewhere that is better? I recently got the neoprene gaskets for the rocker covers and they worked really well.

The bosses on the inner and outer cover will meet and the bolt will feel a definate stop.

If the surfaces are true (by correct shimming of the central stud) then the center bolt will pull universally around the parimeter of the cases faces. (cases faces, I like that) A good fresh spungy oring is prefered. If using a string of oring material, (spooled off from the hardware store) keep the split on top, of course.

Johnnymac · Apr 13, 2012

boz said:
Hey John Boz here. The best sealant I have used in years of Britt bike ownership was the old Yamabond grey. They don't make it anymore because some chemical in it was banned or some such garbage. The best replacement I have found is 3 Bond also grey. For cleaning up the old sealant try brake cleaner. I have a tube in my garage and I have an extra O ring that I don't need since I went to a belt drive and dry clutch. I can bring them to the open house tomorrow if you are going.

Hey Boz. Thank you for the offer! Very kind of you. I am going to try to make it up there tomorrow. We are moving next weekend so I really have to finish packing tomorrow.

hayabusaman0 · Apr 13, 2012

Also make sure that the inner is not cracked by the centre mtg bolt. Mine was as the P.O. had not shimmed it out. I had mine welded up, but had to use a cap head screw in place of a hex, the welding also "pulled in" the face joint so that had to be modified too. All good fun.

HTH Paul.

How tight for MKII Primary cover?

pete.v

Johnnymac

hayabusaman0

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