Metering jet removal - cylinder head

Information relating to the Matchless G12 or AJS Model 31 650cc twin
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Metering jet removal - cylinder head

Postby tony54 » Sat Jul 13, 2019 10:54 am

Cylinder heads removed. There is a restricted flow (compared to the other 3) on one of the metering jets when blowing them through with compressed air suggesting something may be lodged above it. I can pass a length of soft wire easily through 3 of them right through the oil passage but not the 4th. Could anyone advise how to remove the jet please. Many thanks.

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Re: Metering jet removal - cylinder head

Postby 1608 » Sat Jul 13, 2019 5:26 pm

If its blocked then a little swarf from a drill wont hurt. But, I would use a drill bit just big enough to enable using a self tapper screw to then pull the plug out. A too bigger drill risks enlarging the hole making a replacement plug a loose fit.
The manual suggests swaging the new plug so its a good snug fit.

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Re: Metering jet removal - cylinder head

Postby tony54 » Mon Jul 22, 2019 4:40 pm

Many thanks for that, will give it a go.

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