Carbs for a 1969 Commando?

Are Amal premiers the best choice for a 1969 Commando?

The best who knows.
The Wassell Evolution Amals seem to do the job also.


Edit.
What is the better carburetor from that general period for a 750 Commando.
The Dellorto PHF 30 mm round slide which would make the Amal look like a semi controlled leak.

The problem with them is size paied up and a decent second hand set (not the modern version) would cost $600 to $1000 ready to bolt on fully refurbished.

The new premier idle circuit system is a big plus on them I cleaned mine tonight in seconds would be a pain on the older ones, very responsive carbs as well to throttle input gets my vote.

Jackman said:

Are Amal premiers the best choice for a 1969 Commando?

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IMHO, yes.

However, Amal has all the Norton 930 carbs on backorder right now. Very limited numbers of 932's are available. You may find someone with some old stock Zinc 930s still, but the current Aluminum 930's are on back order. Since you have a 69 and they don't have the special Norton needle or spraybar, you may be able to find some 930s for a Triumph and jet them - that's easy. You'll also have to file off a bit of the side of each to get them to fit side-by-side.

I will announce it in the For Sale section when Amal fills my 930 Norton backorders. They will probably fill bigger sellers first.

Thanks, I forgot I made this post hence the delayed response from me , anyway I try a rebuild of the 930 I have maybe they’ll be fine. Just waiting for warmer weather to start wrenching.

I've got Amal Premiers on two of the Commandos and Wassels on the other. Can't tell a difference in performance. The Amals have a bit nicer exterior finish but the Wassels are a lot cheaper.

Del Ortos and Mikunis may work much better than Amals but they are too wide and must be splayed away from each other which inhibits flow and causes mounting problems. Keihin carbs are higher quality and are narrow enough so they can run parallel like Amals - they come mechanically synced so you don't have to worry about that, you only need one throttle cable. I like the CRs best because they are better looking, closer to period, have smoothbore flow, not as big as the FCRs and don't have the thirsty accellerator pump. Very smooth idle. The only problem is the expense (but they are cheaper than FCRs).

Time Warp said:

The best who knows.
The Wassell Evolution Amals seem to do the job also.

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Edit.
What is the better carburetor from that general period for a 750 Commando.
The Dellorto PHF 30 mm round slide which would make the Amal look like a semi controlled leak.

The problem with them is size paied up and a decent second hand set (not the modern version) would cost $600 to $1000 ready to bolt on fully refurbished.

Click to expand...

I can't see the point of using Wassell clones when the genuine article is available! Wassell products are notoriously crap.
We are lucky enough to have genuine carburetors still in production and Amal concentric don't look totally out of place on a Commando unlike Mikunis or any other Japanese carb.
This is just my opinion, of course one is free to do as he likes.
Eric

jseng1 said:

Del Ortos and Mikunis may work much better than Amals but they are too wide and must be splayed away from each other which inhibits flow and causes mounting problems. Keihin carbs are higher quality and are narrow enough so they can run parallel like Amals - they come mechanically synced so you don't have to worry about that, you only need one throttle cable. I like the CRs best because they are better looking, closer to period, have smoothbore flow, not as big as the FCRs and don't have the thirsty accellerator pump. Very smooth idle. The only problem is the expense (but they are cheaper than FCRs).

Click to expand...

I use two 3r4 mm Mk2 Amals side by side on my 850. with corresponding rubber mounts. My inlet ports are tapered 2mm per side for the first 25mm. But I use methanol fuel. Anything can be made to work, as long as you strictly follow the tuning sequence. With any motor, you cannot follow anyone's suggestions about jetting and expect it to be perfect first time you run the bike. I prefer Amal carbs to Mikunis, but I use Mikuni needles. I believe the material of manufacture in Mikuni carbs is higher in zinc content and is more likely to be affected by alcohol.

acotrel said:

I use two 3r4 mm Mk2 Amals side by side on my 850. with corresponding rubber mounts. My inlet ports are tapered 2mm per side for the first 25mm. But I use methanol fuel. Anything can be made to work, as long as you strictly follow the tuning sequence. With any motor, you cannot follow anyone's suggestions about jetting and expect it to be perfect first time you run the bike. I prefer Amal carbs to Mikunis, but I use Mikuni needles. I believe the material of manufacture in Mikuni carbs is higher in zinc content and is more likely to be affected by alcohol.

Click to expand...

If you use bigger carbs you might find that when you open the throttle too quickly the motor can gasp. The taper on the needles is designed to compensate fot loss of vacuum. I run mine as lean as possible and open the throttle a bit slower. That way I get better acceleration