SOHC.co.uk Forums > CB500/550

exhaust stud ..... welding the head

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MikeM:
while I wait for a repair shop answer I have emailed a few local machine shops

a few have said they can fill the exhaust stud hole with weld and retap back to original m6 but this may cause head to warp causing more work to be needed

ie machining the flat surface and possible work on valves and stems

advice needed on this one..... starting to think might as well get a new head

Paull:
Hi MikeM,

I Have had stripped 6mm treads in a 650 head I made special studs.

This is how i did it, Drill stud hole to 6mm, tap tread to 7mm, take 7mm round rod and tread, turn down the bit that sticks out to 6mm and tread it, done. Or you could see if the 7mm tread will go through the exhaust clamp, 7mm nut, job done. 

No Heat, No twist

Just a thought.

Works for me.

Paull

Bryanj:
There should be enough meat to tap out to 8mm and make a stepped stud to fit as 7mm taps are not always that easy to get

MikeM:
it has been tapped to m8, I have the m8 to m6 stud, problem is the m8 heicoil pulls out ?

machine shop not interested in small job

Paull:
Hi MikeM

What size is the hole that is stripped ?

I assume you have a 10mm hole for an 8mm helicol.

Just retread the hole to whatever size will hold, give me a shout and I will make you a stud to fit.

Hope this helps.

Paull   

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