1961 350 Is 50 psi compression too low

Information relating to the Matchless G5 or AJS Model 8 350cc Lightweight
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Joined: Tue Apr 16, 2019 8:36 pm
Location: UK

Re: 1961 350 Is 50 psi compression too low

Postby Oldcarguy » Sat Apr 27, 2019 6:47 pm

Update, the head bolts needed a turn and a quarter to get the torque settings as mentioned above it started a lot better, had it running with the tappet cover off to check for oil feed all ok but a bit too quiet, so I let it cool down a bit then adjusted the tappets so the push rods just turned.Then the next thing bit me throttle sticking open spent 1 hour smoothing a
rough area in the carb body so now runs better than it has. I'm a little surprised at how loud it is now it is revving cleanly. Does anyone on here know Geoff Clayson ?
Last edited by Oldcarguy on Sun Apr 28, 2019 1:23 pm, edited 1 time in total.

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Re: 1961 350 Is 50 psi compression too low

Postby Ozmadman » Sun Apr 28, 2019 11:53 am

Oldcarguy wrote:Well a slight change for the better,took off seat & tank to get to the decompressor and found the cable was not completely free so wound the adjuster out a little and now I have close to 100 psi on a cold engine this may have been the reason it would not start again when hot as everything would have expanded, I am now going to remove the rocker box and try a re torque on the head bolts to see if this will stop the leak.Fingers crossed

bet you are :D :D
1960 Model 8
1974 Yamaha RD250B US Model 6 speed


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