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SRM 750 #748373
09/08/18 4:49 pm
09/08/18 4:49 pm
Joined: Sep 2016
Posts: 224
Norway
M
Manx Offline OP
BritBike Forum member
Manx  Offline OP
BritBike Forum member
M

Joined: Sep 2016
Posts: 224
Norway
Fellas, what pitch thread are the head bolts on a SRM jug?

My bike started blowing from the head gasket and under inspection the studs are a tiny bit too long.

reading the instructions again it says that if you have a 70+ head that the studs should be shortend by 3mm, something I didn`t do because I actually didnt know I had such a late head..doh!

I have stripped the threads, so ne to fing the right size helicoil.

Cheers.


1966 Rickman Metisse (a65)
1957 B33
1959 lambretta li 150
1960 lambretta li150
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Re: SRM 750 [Re: Manx] #748459
09/09/18 5:21 am
09/09/18 5:21 am
Joined: May 2013
Posts: 5,583
West Yorkshire
Allan Gill Online happy

BritBike Forum member
Allan Gill  Online Happy

BritBike Forum member

Joined: May 2013
Posts: 5,583
West Yorkshire
Do you have a thread gauge to measure the bolts? Factory barrels were 26tpi (from memory)


beerchug
Re: SRM 750 [Re: Allan Gill] #748640
09/10/18 5:45 pm
09/10/18 5:45 pm
Joined: Sep 2016
Posts: 224
Norway
M
Manx Offline OP
BritBike Forum member
Manx  Offline OP
BritBike Forum member
M

Joined: Sep 2016
Posts: 224
Norway
measured to 24 tpi and confirmed by SRM that its UNF


1966 Rickman Metisse (a65)
1957 B33
1959 lambretta li 150
1960 lambretta li150

Moderated by  Allan Gill, Jon W. Whitley 

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