Concentric 930 jetting

[limeyrob]

My engine will be close to assembled soon and I have a 930 (30 mm) concentric to go on it.  No history on the carb but its unlikely to be off an A10.
The engine came to me in bits with no carb so I'm looking for suggestions to get it running OK.

8.5:1 comp
356 cam
alloy head
no airfilter
Suggestions please!

[chaterlea25]

Hi Rob,.
what slide do you have?
You may find that the fixed pilot jet (bush)
Is too weak?
Setting the float height is awkward due to the downdraught on the head inlet 
Search for Musky's posts on this subject.
Start off with the same main jet as Super Rocket, 420 I think 

John

[limeyrob]

Engine has yet to run, the head goes on this week.  Carb could be off anything.  Its got a 190 main jet and 106 needle at the moment.  I was thinking more a 210/220 for contric?

[Black Sheep]

420 in my experience is far too big. My alloy head A10 has a 300 main jet in a 389 monobloc. Concentrics usually run a smaller main jet so perhaps 270 for a first try?