SOHC.co.uk Forums > CB500/550

stripped threads in engine for exhaust

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Bryanj:
You have to be certain you have the meat for a timesert, i think they are an m10 outer thread but you need a different tap as its not the common m10

Matt_Harrington:
Your initial thought of a larger bolt could work. You could always machine (or get machined) a stepped bolt - ie M8 for the head and then stepped down to M6 for the Flange. Just a thought

Oddjob:
The early CB1300 SCC54 engine used stepped down exhaust studs, 8mm into the head but 7mm on the outside. They changed them to 8mm all the way through later on.

I have some somewhere if you'd like to try.

Siloxious:

--- Quote from: McCabe-Thiele (Ted) on September 08, 2023, 06:09:33 PM ---The Helicoil will also return it to a M6 thread as well if you are not aware.

--- End quote ---

Just a heads up, the helicoil worked! I stripped these threads because I thought the exhaust pipe joint should touch the block. I suddenly realised this and wow, I was annoyed with myself.

Now with the helicoils, the exhaust pipes fit nicely on the block and I haven't had any problems so far.

I'll update if the helicoils loosen when riding the bike for a bit.

Thanks everyone!

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