michael 1957 g3 Restoration updated !!

Information relating to the Matchless G3 or AJS Model 16 350cc Heavyweight
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Re: michael 1957 g3 Restoration

Postby vn800b » Wed May 16, 2018 8:14 pm

Hi all,

Did a little more on the matchless tonight after work, still only going up the road as it feels horrible to ride!!
ive been reading up a bit on the carb settings as i took the plug out and it was black!! so i went to the mixer screw and it was all the way shut!!
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Re: michael 1957 g3 Restoration

Postby vn800b » Wed May 16, 2018 8:29 pm

pic of spark plug!!
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Re: michael 1957 g3 Restoration

Postby SPRIDDLER » Thu May 17, 2018 7:10 am

It looks to me that air screw may have been closed up to counteract an air leak (see the staining) between the carb spacer and the cyl head.
I poke badgers with spoons.

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Re: michael 1957 g3 Restoration

Postby vn800b » Thu May 17, 2018 9:18 pm

thankyou spriddler i will look at that,
cherrs mike

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Re: michael 1957 g3 Restoration

Postby vn800b » Thu May 17, 2018 9:46 pm

i take it that would be a new gasket??

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Re: michael 1957 g3 Restoration

Postby Mick D » Fri May 18, 2018 7:25 am

Hi

I'd suggest a full strip and clean of the carb, it will only improve the running and will give you the opportunity to assess the overall condition with a view to future rectification.

You'll need a set of seals / gaskets, club spares sell them and there's a nice break down of the carb on the AMAL website:

http://amalcarb.co.uk/generic-376-monobloc.html

Regards Mick

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Re: michael 1957 g3 Restoration

Postby vn800b » Fri May 18, 2018 4:05 pm

thanks mick d thats great,
cheers mike

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Re: michael 1957 g3 Restoration

Postby vn800b » Wed Jun 13, 2018 6:49 pm

hi all

had a bit of time working on the matchless tonight, thanks to roger (a club member) that invited me around to see his matchless g3l,and i picked up a lot of tips on owning and running a britbike! ive bought a rebuild kit for the carb, the old needle said b on it, but the new one said c on it!! and i notice that the manifold rubber was split too!! on the carb body top the threads seem very worn down, and just wondered does that mean a new carb??i will try and upload a video of it running at the weekend.
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Re: michael 1957 g3 Restoration

Postby Mick D » Thu Jun 14, 2018 6:40 am

Hi

The split manifold spacer must be replaced - it will result in a weak mixture if not, they're cheap enough but make sure you get the correct bore for your bike.

The worn thread will require the carb to be replaced if the cap cannot be secured, but there's no need to screw it on any more than 'nipped up', as long as it 'nips up' it will be OK.

Carry some insulating tape when your riding - if the thread lets go you can pack it out with tape as a 'get you home'.

Regards Mick

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Re: michael 1957 g3 Restoration

Postby Duncan » Thu Jun 14, 2018 7:43 am

For the carb top you can:

Fit it as it is if it still holds okay (its only really a problem if it will not hold) or:

Put a few turns of PTFE tape on it to pack and hold the top ring, this will not be obvious externally.

Buy a new top ring, the new thread will usually compensate for a worn body.

or a not very pretty solution cut the tip ring vertically and clamp it on with a jubilee clip.

if all else fails buy another carb, as you have already invested in a rebuild kit it may be worth persevering with what you have first.

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