Wow, just checked the Amal site and a Mk 1 Concentric is a lot cheaper than a Monobloc!

Ah right, thanks for confirming that Deryk.

Hi tyrefryer, your bike has the heavy weight road swing arm. it is a one piece, H shaped item.it is much deeper at the hinge end,adding to your chain problem, it also adds about 2 inches to your wheel base. look at Gordons bike, he has the later 2 piece arm of a so called light weight. they are not a straight swap.

as for the 18 inch wheel versus the 19 inch, the profile of the 18 at 100% makes the O/D almost identical.also the 19 has 3/8 inch block depth

compared to 1/2 inch on the 18. dont know what year the picture of Gordon was taken but i looks like an 18 inch wheel to me. gov 132 still had a 19 inch rim in it last year at the museum.

a ratio of 27 engine revs to 1 rear wheel rev in 1st gear is a good starting point for trials gearing.but top speed is a bit restricted!!!

Thanks Stan, that's very useful to know. Which museum are you referring to and is the bike on permanent exhibition there?

Edited September 18, 201411 yr by tyrefryer

Have sent you an email Deryk, thanks!

It looks like the overly complicated and badly worn folding kickstart lever and mechanism I have is nothing to do with AMC bikes. I was going to build up the worn pads on the lever and holes with weld and grind/drill back but I don't think the spline is right anyway so I think I'll look for a new replacement. As yet I haven't been able to find a folding lever for a Burman B52 so if anyone knows where I might get one I'd be glad to hear, or if any alternative kickstart splines are the same? Preferably something similar to what would have been used on a trials bike of the period?

Thanks.

After a bit of research I've found Terry Weedy, http://www.terryweedy.com/classic-kickstarts.html

And an excellent review on here http://jampot-spares.com/forum/viewtopic.php?f=18&t=13085

Cheers.

Glad you have found Terry, I think most of us use his kickstarts,good kit.I've recently bought some footrests off him for another project at the Bonanza scramble,again not 50p,but what he sells is small volume stuff and not made in China - worth the difference in my opinion.

Hi Jon, yes I sent my cheque off to Terry and have also bought a new kickstart shaft. Hopefully when I get the lever I'll be able to have the bike ready to use (for now). Cheers!