G11 Carb

Tolly · Post by **Tolly** » Fri Oct 10, 2008 8:29 pm

Hi chaps and chapesses, just a brain pick if I may.
The book says I should have a 376/58 Amal carb on my '57 G11 but in fact it's a 376/288 all jetted up by the book. The question is can anyone tell me what the difference is between the /58 and /288 as I can't find any info when doing a search.

GSAX1 · Post by **GSAX1** » Fri Oct 10, 2008 8:44 pm

Amal 376/288 was originally fitted to Norton 88 & 650 SS. However when correctly jetted will suit your bike perfectly. The number after 376/ only indicates the factory jetting.

Michael

Tolly · Post by **Tolly** » Fri Oct 10, 2008 10:53 pm

Thanks Michael, I have jetted as specified but seems to hunt a little on tickover which I can't seem to cure, mixture screw makes little difference, it's fine through the rest of the range though.

Many thanks.

wilko · Post by **wilko** » Sat Oct 11, 2008 12:49 am

Make sure you dont have a tight tappet situation. Dugless

Tolly · Post by **Tolly** » Sat Oct 11, 2008 9:19 pm

Thanks "Dugless" I have gone through the basics several times. It's strange, when I purchased the bike it was a non-runner tucked up in a garage for 12 years but all original. I had the mag rewound (to obtain a spark) and it ran like a hammer drill on the back of a JCB, I thought it was going to break up the drive I had to strap it down to stop it wandering off. Having re-timed the valves and re-jetted the carbs etc. it runs a treat all except the tickover. I may try a higher # slide to see the difference.

wilko · Post by **wilko** » Sun Oct 12, 2008 1:00 am

Does it do the same thing without airfilter attached? Try experimenting by covering the carby partially with your fingers. Does it make it worse or better? Douglas

Tolly · Post by **Tolly** » Sun Oct 12, 2008 2:38 pm

I have no air filter fitted and it makes little to no difference if I partially cover the intake, hence my thought on a bigger cut-a-way slide.

Thanks for your input.

GSAX1 · Post by **GSAX1** » Sun Oct 12, 2008 4:29 pm

Hunting on tickover could be because of a worn slide. Have you checked that?

Michael

Tolly · Post by **Tolly** » Sun Oct 12, 2008 10:07 pm

Yes, I put one of the chrome ones in when I re-jetted. I think I may have to bite the bullet and buy a new carb.

Thanks for your suggestion Michael.

GSAX1 · Post by **GSAX1** » Sun Oct 12, 2008 10:17 pm

Changing the slide only fixes half the problem. The carb body itself is worn as much as the slide. See in Jampot, there's an ad from a guy that fixes them. He did one for me and did an excellent job.

Michael