G2 - low compression and little power

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
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G2 - low compression and little power

Postby jonhal » Tue Nov 13, 2007 7:10 am

Sorry, senior moment, barrel- rich, was thinking about my Arrow. Could be a leak though.
John(very humble)

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G2 - low compression and little power

Postby crawsue » Tue Nov 13, 2007 5:37 pm

Hard work never killed anyone.....but why take the risk?

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G2 - low compression and little power

Postby crawsue » Tue Nov 13, 2007 5:42 pm

I found that adjusting the ignition while the engine was ticking over made a huge difference to my G5.Open the access plate and slacken off the back plate screw a little--just enough to allow some swivel on the plate then gradually advance the ignition,it should start to tick over a bit faster as you get to the correct setting.Worth a go before stripping off the head.
Hard work never killed anyone.....but why take the risk?

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Location: CHESHIRE UK

G2 - low compression and little power

Postby sej » Wed Nov 14, 2007 5:31 pm

Hi Buscuit
The timing is set up ok thanks. The carb does fit onto the head via a stub your dead right, and I've made sure its really well sealed, so fingers crossed should be fine.

Hi jonhal
Thanks the the tip, I will keep an eye on the seal once the engine is warmed up.

Hi crawsue
I will try slight adjustment of the back plate as the throttle it not really crisp. It was set it up with a couple of wires and bulb, I will mark that position before I start and tweak it a bit.

Hi Paul
You were spot on with the air valve position, the engine is running much better now. I will try some other suggestions to see how crisp I can get it, I would say its sorted 95%. I will not be able to do any more until the weekend.

Thanks very much everyone, I really appreciate the help.
All the best
Steve

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G2 - low compression and little power

Postby gerry wilson » Tue Nov 20, 2007 12:05 pm

The 25psi compression reading must be wrong, the engine would never start,look through the carb intake to check the position of the choke slide in relation to the lever position. You should always check the compression with the choke off and the throttle wide open, otherwise very little air can get into the cylinder to be compressed.

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G2 - low compression and little power

Postby lawrence » Tue Nov 20, 2007 8:10 pm

Welcome to the site Gerry. Hope we hear more from you

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G2 - low compression and little power

Postby sej » Fri Nov 30, 2007 9:06 am

Hi Gerry

Sorry for the delay in reply, I did not realise I had a message. Really good tip, I think the choke was on when I first checked the compression, I will give it another go.

Best Regards
Steve

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