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Re: [turbobike] Re: SOHC Honda headgasket problem

John C Williamson (john.williamson5@virgin.net)
Thu, 20 May 1999 12:51:44 +0100

Try a Suzuki!

Slightly more seriously, make sure that the gasget is well annealed, and
that the surface of the head / block is FLAT and not polished. A flycutter
usually used to machine the surfaces leaves a 'machining' pattern on the
surfaces. This 'bites' into the gasket and holds it into position. Make sure
that the surfaces are fully degreased, and then use a SMALL (I mean very
small smear!) smear of silicone gasket sealer (very thinly!) around all the
bore edges, and oilways. This stops the capilliary effect that actually
makes the oil penetrate under the gasket, which allows the gasket to blow
out of position. Try to get stronger studs as they probably lift / stretch
under boost.

John Williamson

----- Original Message -----
From: Joe Allan <beak@seaside.net>
To: <turbobike@natvideo.com>
Sent: 20 May 1999 06:13
Subject: [turbobike] Re: SOHC Honda headgasket problem

> Hello All;
>   Just came back from trying out my supercharged 750 Hondamatic dirt
> dragger, goes good but after the 10th run down the track the copper head
> gasket blew :-(  Pulling it apart tomorrow....any hints??
>   Stock studs only allow 16 pounds torque.
>  Joe Allan
>  Vancouver Island
>  Canada