I think he does. No doubt he‘ll be on in a minute.
Amal Mk 1 concentric 30 mmI think he does. No doubt he‘ll be on in a minute.
And a Mk1 (alleged!) camThere you go. I was wrong. Got my cams confused with with my carbs.
From memory my needle jet is a 105. I know for sure that the main is a 230. I also use one of my shim kits (see the advert in OVR) to fine tune the needle position. I have it half way between the middle and lower (rich) groove. Oh also use a Spares Co foam air filter and my exhaust is essentially a straight thru pipe that ends next to the rear axle.Does Martyn use Mk2 Amal ??, If He is some people use a 105 needle jet, I have found 106 for me, U.K.
I know He says use a bigger main jet, But the petrol still has to go though the needle jet.
And being hotter out there, I would have thought it needs to be rich.
Hi Brian. From my experience they make for a more efficient combustion allowing for later ignition timing, like 28 degrees btdc , resulting in more power out of your engine. For years I had to run my twin spark head with one plug replaced with a decompressor to help my starting as I was using a bth, giving me a 4 - 32 ignition curve from memory. I fitted a Grosset electronic ignition designed for a twin spark set up giving me a 4 - 28 ignition curve, fitted 2 plugs and the power gain was massive. I was getting a bit of pinging under load so after talking to David Dunfey I adjusted it to 2 - 26 and gained even more power.