Amal 932 jet suggestions

Coolhands

Coolhands

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These carbs were on my 72 Combat. I’ve since installed a 70 non combat engine.

Has 932s with a cylindrical spray tube 106 needle jet and mismatched mains 310 and 340! Seems large.

Replacing slides needles and jets.

I’m at sea level. What should I start with for mains?
 
According to Norton Twin Restoration by Roy Bacon the standard jetting on the ‘72 combat with 932’s is 220 main, 106 needle jet, needle position 1, #3 slide
 
Amal Vehicle Application Listing agrees with the above for 72 Combat, but you said you are putting these on a 70 engine which was spec'ed for 30mm carbs. Maybe someone who has tried putting 32mm carbs on 30mm head can chime in here on jetting.
 
If it’s of any help….

On the 1970 commando with 30mm carbs it’s a 180 main and the clip is at #3, but the ‘69 used a 220 main, and the G15 used a 230- again with 30mm units- so a 220 is probably a good place to begin.

All of them used the 106 pilot, but the needle position changed
 
Thanks for the replies everyone. Helps to know that what I found was definitely way off! I’ll grab some 220s and give it a go.
 
Who makes a 32/30 adapter manifold? Didn’t really think about the difference when I swapped engines. Would that make sense?

I have the combat head but I’m gonna use that building that engine.
 
Lots of factory 32/30 manifolds floating around, some 850’s used them. I’m planning to use this setup on the ‘71 750 I’m working on now, just because I have a new pair of 32s and the manifolds on the shelf.
 
Coolhands said:
Who makes a 32/30 adapter manifold? Didn’t really think about the difference when I swapped engines. Would that make sense?

I have the combat head but I’m gonna use that building that engine.
Click to expand...
30x32 were on used on RH10 heads and AFAIK, no one makes them. 28/30 on RH1 heads. The rest were 32x32.

Since you are not worrying about the correct carbs, you shouldn't worry much about the manifolds. if you have a RH1 head 28x30 will work fine and you could open the 30 end to 32 if you wanted with a Dremel. The 32x32 will work too.

If the carbs you have were meant for a Combat they should have:

Right Carb: R932/19
Left Carb: L932/20
Main Jet: 220
Needle Jet: 106
Throttle Valve: 3
Needle Position: 1
Needle: Std
Spray Bar: Std

For a 70:
Right Carb: R930/46
Left Carb: L930/47
Main Jet: 180
Needle Jet: 106
Throttle Valve: 3
Needle Position: 2
Needle: Std
Spray Bar: Std
 
marshg246 said:
30x32 were on used on RH10 heads and AFAIK, no one makes them. 28/30 on RH1 heads. The rest were 32x32.

Since you are not worrying about the correct carbs, you shouldn't worry much about the manifolds. if you have a RH1 head 28x30 will work fine and you could open the 30 end to 32 if you wanted with a Dremel. The 32x32 will work too.

If the carbs you have were meant for a Combat they should have:

Right Carb: R932/19
Left Carb: L932/20
Main Jet: 220
Needle Jet: 106
Throttle Valve: 3
Needle Position: 1
Needle: Std
Spray Bar: Std

For a 70:
Right Carb: R930/46
Left Carb: L930/47
Main Jet: 180
Needle Jet: 106
Throttle Valve: 3
Needle Position: 2
Needle: Std
Spray Bar: Std
Click to expand...
This is really great, thanks!

Looks like I have a 932 carb from something completely different. In addition to the big jets it has a 3.5 slide.

If I want to set the 932 for the 70 engine should I fit the 220 main or the 180?

Gonna load up a cart and see if it makes more sense to just find a set of 930s.
 
Coolhands said:
These are what I have so I suppose the are for a combat.

amalcarb.co.uk

Shop Carburettor for a Norton combat (Paired with 932/26) | AMAL | AMAL Carburetters

Carburettor for a Norton combat (Paired with 932/26)
amalcarb.co.uk amalcarb.co.uk
Click to expand...
/19 and /20 are for Combat. AMAL also believed that there was a 73 Combat that used /26 and /27 and they still list it. It was not the full Combat spec but was higher performance than earlier 750s.

/19 and /20 come with 220 main jets. /26 and /27 come with 230 otherwise, they are the same. For E10 gas, I like one size bigger but don't worry much about the main jet for street use - hardly ever have the throttle open enough to use the main jet.
 
Thanks all. Im going to set these up for the regular 750 engine now. If you think of any other ideas or anything I missed let me know.
 
The main jets do not usually affect performance at throttle openings of less than two thirds, unless they are miles too lean. If you use the larger recommended main jet, what becomes critical is the size of the needle jets and the shape of the needles. The slide cutaway and low running jets can affect performance at throttle openings of less than one third. If you lower the needles by putting the clips one notch higher, you should be able to induce a cough in the motor when you ride the bike, then raise the needles one.
 
everything looks a little “mixed bag so I’m going to replace the work slides with some 3s new needles and jets and see how she goes. Meanwhile cleaning out the idle circuit real good.
 

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