g9 cams

Biscuit · Post by **Biscuit** » Mon Jun 16, 2008 10:50 am

There are competition cams available, by themselves they will be of little benefit. With the other alteration to go with them, ie carburation, exhaust and ignition timing the bike would probably be unusable on the road.

GSAX1 · Post by **GSAX1** » Mon Jun 16, 2008 12:44 pm

If you want power then I don't think an AMC 500 twin is the right machine to start with

Don Madden · Post by **Don Madden** » Mon Jun 16, 2008 5:09 pm

I have seen a 1961 G9 fitted with G11 barrels & pistons but using the original head. Strange combination but the cylinder pressure while kicking was in the normal range & should boost torque, although the pre-1960 piston crown shape is a mismatch for the 1960 head.

Cheers, Don.

Biscuit · Post by **Biscuit** » Mon Jun 23, 2008 10:33 am

Jampot Spares Limited, see above 'Club' then 'Spares.

Duncan · Post by **Duncan** » Mon Jul 28, 2008 11:28 am

Sid, the club (JSL) can normally supply new camshafts for the twins the parts that you need are:

025084 INLET CAMSHAFT
025085 EXHAUST CAMSHAFT

Are your cam followers (018576 CAM FOLLOWERS; 1953-61) in good condition as they tend to wear more than the camshafts.

sid nz · Post by **sid nz** » Tue Jul 29, 2008 11:05 am

they looked ok but i guess it wouldn't hurt to do both at once as cams were quite worn. what about the bushes? are they supplied or shall i turn some up in the lathe? if so what material and what clearance?
thanks

Duncan · Post by **Duncan** » Tue Jul 29, 2008 11:58 pm

Sid, availability of parts, that’s the beauty of JSL.

I believe the bushes that you desire are:

010474 PLAIN BUSH; CAMSHAFT; (x2)
011654 FLANGED BUSH FOR CAMSHAFT; (x4)

A competent engineer (not me then!) should easily be able to manufacture some new ones but I do not have any details as to the material or dimensions, you will have to line ream the bushes once fitted to suit the cams and set the endfloat by having the flanged bushes slightly proud to start with.

If you are incredibly lucky you may get away with the existing bushes as the new cams will be a tighter fit, on second thoughts no one is that lucky.

It is very easy to spend other people’s money, if you do intend to replace the cam followers also check out the cam follower spindle (011626 CAM FOLLOWER SPINDLE) for wear, normally they will fall out if you heat the casings, they can become quite ridged.

sid nz · Post by **sid nz** » Wed Jul 30, 2008 7:38 am

thanks a lot for your help.
sid

sid nz · Post by **sid nz** » Fri Apr 03, 2009 3:33 am

hi. just wondering hoping that someone in nz or australia has a set of cams for my 1960 g9?
much needed, as some hopeless twat dropped one of mine while at the cam grinding shop and broke the end off it.
thanks
sid

Don Madden · Post by **Don Madden** » Fri Apr 03, 2009 5:21 pm

Be sure any you but match the profile of yours. They changed the grind in 1957, I think, & there also some of the speed kit ones about. I have the correct ones, but in California. Cheers, Don.