tuning 930's

Status
Not open for further replies.

rgrigutis

Joined
Dec 27, 2008
Messages
295
Country flag
trying to get the idle right on my '72 with amal 930's. the engine only responds to the right side carb. am i correct in thin king the synchronization is off? i can get him down to 800. the right side exh pipe is discolored a bit, plugs are a dark tan, occassional backfire or pop on the right side when revving from idle. tank is 2/3 full of av gas. bike runs super. i know i'm chasing my tail trying to get a steady idle w/ these old amals but am wondering why adjusting the left carb has no effect. thanx, rick
 
Are the carbs sleeved? I farted around with the Amals on my Commando for weeks trying to get them to idle properly when I first got the bike. Tried all the syncronization tips etc. to no avail. Never could get them to idle right and got a Mikuni!! One of the slides was worn more than the other and I assume this was what was causing my problems. Since that experinece, the first thing I do now with all my bike restorations using Amal carbs is to get the carbs sleeved. Then you can start tuning from a solid baseline knowing the carbs are not leaking air.
 
CanukNortonNut said:
http://www.walridge.com/section/view/?fnode=175

Here is a very straightforward way to sync Amal Concentric carburetors.
Check the play in the slides. If it is excessive then correct this first.
Cheers,
CNN
Click to expand...

To synchronise I always use a pair of vacuum gauges that way any small differences in airflow can be dealt with by getting exactly the same readings on right and left cylinder
 
well i syned both carbs, pretty staightforward thanks to the link provided . right carb will idle down to 700-800 while left needs 1500. tommorrow i'll unclog the left pilot and see what that yields. neither slide seems sloppy, both quite close actually. this to my untrained norton senses.
 
Status
Not open for further replies.
Back
Top