Hitchcocks Forum

Could somebody tell me size of main jet any other settings for an amal concentric 622 carb i fitted to my 350 bullet

622, isn't that a 22mm carb? I would have thought that is a bit small for the 350. Isn't the standard carb 24 or 26mm?

The original Monobloc would have been 1 & 1/16" so 26mm would be about right. As to jetting, email our Hosts direct but I'd fit the same specification jets and slide as the Monobloc originally fitted, at least as a starting point. Just one change, I believe it is recommended to reduce the main jet by 5% (I think,) when replacing a Monobloc with a Concentric.

REgards, Mark

I suspect you have miss-typed and it should read 626, which is what you would expect to find on a 350 Bullet. Have a look on the AMAL web site, I'm sure the standard settings are on there. That is standard settings for all 626 Concentrics when supplied by them, which should be a safe starting point for a Bullet.

The correct carb is a 626,fitted with 106 needle jet,170 main jet,slide cutaway 3.5,. needle clip in second from top groove,air screw for starters 1.5 turns out
Make sure valve clearances and timing correct first.

Hope this helps,good luck.

(Am running 1956/1961 350's as above)