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612 head gasket recommendations
Posted: Sat Jul 18, 2020 9:10 am
by Andy C
Composite or copper?
When I built my 612 originally I used a copper head gasket and never had any issues, when I did the rebuild after I bought the bike back I fitted a composite gasket which I notice has begun to weep a little.
The thinking was that the composite gasket would give a better seal.
So composite or copper- or have I answered my own question?
Re: 612 head gasket recommendations
Posted: Sat Jul 18, 2020 9:40 am
by PeteF
I've had good success with composite head gaskets with a smear of Wellseal.
Re: 612 head gasket recommendations
Posted: Sat Jul 18, 2020 3:56 pm
by Adrian
The alternative is to go gasket-less if that doesn't bump your compression up too far, with the barrel machine for a couple of O rings around the top of the push-rod tunnels.
A.
Re: 612 head gasket recommendations
Posted: Sat Jul 18, 2020 11:42 pm
by Meteorstorm
I sprayed the gasket with Copperspray on my 612cc,never saw any inkling of a weep
.
Re: 612 head gasket recommendations
Posted: Sun Jul 19, 2020 6:19 am
by PeteF
It is important to get the mating surfaces as clea, flat and scratch free as possible. Wet and dry on a sheet of MDF suffices.
Re: 612 head gasket recommendations
Posted: Mon Jul 20, 2020 11:48 pm
by stinkwheel
I used the composite with flame ring too and there's a smidge of a weep. I've been using composites on my 350 for a while now and they have been very good.
I do notice the 350 ones have a built-in ring of sealant round the pushrod tunnels which is absent on the 500/535 one.