Opinions Please

Information relating to the Matchless G5 or AJS Model 8 350cc Lightweight
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Opinions Please

Postby Ozmadman » Mon Feb 11, 2019 10:55 pm

I started my Model 8 up yesterday after it sitting outside under cover since October and noticed a small amount of smoke/steam rising from around the rocker cover area (it was very cold out) At first I thought it may be all of the ACF50 burning off the engine and exhaust but it persisted longer than I thought it should so I shone my really bright torch around the engine only to see some minute air bubbles/oil coming from the head gasket (the usual place where the oil feed hole rises up through the barrel to the head. What do you think... should I try to just re-torque the head hoping that this will sort it or do you think I need to go all the way and replace the head gasket? It has a composite gasket fitted. thanks
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed

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Re: Opinions Please

Postby Rob Harknett » Mon Feb 11, 2019 11:51 pm

Did you warm it up to see if it stopped.

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Re: Opinions Please

Postby Mick D » Tue Feb 12, 2019 7:46 am

Hi

It could just be evidence of fluid which has seeped into the gasket boiling off - like Rob says, run it for a good while and see if it stops.

If it doesn't I'd be tempted to go for a re-torque before biting the bullet and whipping the head off for a better look.

Regards Mick

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Re: Opinions Please

Postby Ozmadman » Tue Feb 12, 2019 12:40 pm

Rob Harknett wrote:Did you warm it up to see if it stopped.

Yes Ran it for about 20 minutes stationary with some revs in between
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed

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Re: Opinions Please

Postby Ozmadman » Tue Feb 12, 2019 12:41 pm

Mick D wrote:Hi

It could just be evidence of fluid which has seeped into the gasket boiling off - like Rob says, run it for a good while and see if it stops.

If it doesn't I'd be tempted to go for a re-torque before biting the bullet and whipping the head off for a better look.

Regards Mick
Thanks , didn't think of that cheers Paul
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed

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Re: Opinions Please

Postby clanger9 » Tue Feb 12, 2019 3:16 pm

Re-torque it first. I got more than 1/2 turn on mine when I checked the bolts last month...
1966 AJS Model 14 250 CSR "cafe racer"
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