Amals. We'll give em a go.

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Well as most of you would know, I am a very happy Mikuni user on all sorts of things.
How ever I am sticking with 32mm Amals, at this stage, on the rebuild, mainly due to the cost of manifolds,filters etc.,
and the overall appearance.
I did purchase a nice pair of " improved " 32s' from PV, and am looking for advice on settings.
Will standard cutaway (2.5) work.?
Does anybody here use Amals with the Idle jet modification, if so what size for Combat.
Would like to get it in one if possible,... You know, they're not like Miks, where you only need a screw driver to get them off.!!!
he he he.
AC.
P.S...... Had a read of some of the Bushmans site today and it explained how to tell if slides are worn...
" If the engine revs slow down when you just slightly take up slack in throttle cable, then slides are worn. "
I assume that when you do this, it must hold the slide tight against the body and thus make a better seal.
Mine does exactly that. It helps to know this when riding as it helps to roll upto a stop, and not try to hold a fast idle
with the throttle. My is working better if I leave the throttle right off, when rolling in. No spit back from the lean off.
It does'nt quite make sense to me but it works. Perhaps it is the fact that the slide is sitting on the idle screw and not junping around.
Never assume.. It can make an ASS out of U and ME.
Anyway, will have the new ones on soon.
 
Do the new ones have the cut-away spray tube or the four-cycle, flat-top spray tube? The original carbs on the Combat had the flat-topped tube as far as I know. Mine are set up with 106 needle jets, correct needle for that spray tube and the clip in the top slot. I am running 220 mains, which might be a bit small but I don't really spend enough time at WOT to test it out very well. The bike is running so well I hate to screw with it.

If I were to swap out for the cut-away spray tube I would be essentially starting from scratch or asking here if others have found they need to set them up differently.

I am pretty sure my slides are #3. But I see I didn't record it in my carb notes and would have to pull em out to make sure. Normally I would have noted it if it were different from stock specs.

Russ
 
If you have bought 32mm carbs from "PV", then are they not able to help with info regarding settings etc? For anyone in Australia its well worth contacting OKO Australia, as they can help with flat slide carbs for a good number of different bikes, and may well be able to supply for Brit machines.
 
I would give them a go just the way they sit. They were running on mine. The only difference is the stage 1 cam. You got them with a set of 35's installed and a set of 30's for spares. With this pilot jet situation, it will be a clean and a consistent flow with no worries as to the condition of the possibly over worked pressed in garbage. But 25's are easily attainable.

I am serious. Try them as you got them. The real issue is if you want to push out the split choke tubes and use the 750 type in conjunction with the 2 ring needles. The needles and spray tubes (choke tubes) go together and have never known them to be interchagable successfully. Also, 220 mains may work better but at least try them first. 230's are in there now.

With all considered and the way they are setup, 2.5 slides are going to be much too rich. But, no 2 Nortons breath exactly alike so run as you got them to determine a baseline. You may be surprised. Other than the cable adjustments, they should be very, very close with little to no screw turning needed.

And one more thing, as mention in the original ad, keep left and right separated. You start swapping slides and floats and you will lose hour of effort and hirt my feelings.

Feel free to contact me if you need more faith.
 
According to this http://www.nortonclub.com/docs/TheNortonCarburetor.pdf Combats had the #3 cutaway.

My 'new' Amals came without the cutaway spray tube, incorrect for my Mk III 850... either way Burlen does sell the spray tubes on their website so you can swap them out if you so desire. They are pressed in though, so you may need to heat up the body to get them to come out. Also the cutaway spray tube matches up to a different needle (different number of grooves on the needle to id which goes with which). On my 850 I just kept it as is and I can't detect any flat spot, pulls strong all the way.

Cheers,

- HJ
 
Hungry J0e said:
According to this http://www.nortonclub.com/docs/TheNortonCarburetor.pdf Combats had the #3 cutaway.

My 'new' Amals came without the cutaway spray tube, incorrect for my Mk III 850... either way Burlen does sell the spray tubes on their website so you can swap them out if you so desire. They are pressed in though, so you may need to heat up the body to get them to come out. Also the cutaway spray tube matches up to a different needle (different number of grooves on the needle to id which goes with which). On my 850 I just kept it as is and I can't detect any flat spot, pulls strong all the way.

Cheers,

- HJ
AC was supplied with both sets of spray tubes and new matching needles.
AC, no need to heat. There are surations that the tube press into. Not an issue for the 750 type, but if you do decide to go that route and then change your mind, the 850 types will have to be lined up. Just a little tappy tap. But try them first!
 
Thanks guys.
PV, I didn't mean to go over your head for advise. For some reason I thought your bike was 850, with a cam.
Will get some more Ks up today, then I'll be happy to spend some time on fitting, and tuning if necessary.
AC.
 
AussieCombat said:
Thanks guys.
PV, I didn't mean to go over your head for advise. For some reason I thought your bike was 850, with a cam.
Will get some more Ks up today, then I'll be happy to spend some time on fitting, and tuning if necessary.
AC.
Go over my head? For criminy sakes, man, get it where you can. I'm just trying to be helpful. In this forum, and probably others, taking the advise of one person is very dangerous. You need a consensus and then your own common sense. :)
 
Big problem with attempting to tune Amal carbs is that many of them are worn out, and adding this to problems related to distorted mounting flanges, will mean that any type of "improvement" will be pretty much a waste of time, until the 2 issues mentioned previously have been properly dealt with.
 
Thanks for the imput Carbonfibre, the pair of carbs I got from PV are in very good cond.
Nice tight slides plus idle jet conversion.
PV,.. What difference did you notice with the 850 style needles and jets. If any.?,
 
Other than spigot mount Amals, its very very easy to distort the mounting flange, so well worth checking this before fitting as air leaks here are pretty common.
 
Carbonfibre said:
Other than spigot mount Amals, its very very easy to distort the mounting flange, so well worth checking this before fitting as air leaks here are pretty common.
AC, these flanges and all other mating surfaces are perfect. They have all check on a marble layout table and brought home. No worries in this regard. What else ya got, Carbonfibre.
 
Just seems lots of people using this forum want to make things very difficult for themselves by choosing to use parts which are poorly made and wear out fast! If an original look is more important than function, then obviously fitting OE parts is the way to go. But in the case of bikes which are actually used on a regular basis, it seems a good idea to fit parts which increase performance and reliability, and which are designed and manufactured properly and dont wear out quickly?
 
Commando's once won endurance contests and they can be made to last but does take more money and effort and repeated maintenance in the long run. You don't have to explain the logic of upgrades but then its just that much less a Norton of yore. i've had it both ways and now appreciate the delight of narrow tire factory set up with bit nicer spunk on dual Amals and AAU wake up call. Two carb springs is a bit of a drag though. Up to about 4-6 yr ago I'd be in your camp on upgrading everything in sight , but then the dang lack of horse power shows up to run with the big dogs. Some us just like the quiant handyness of a bone stock one, knowing it needs us to get along.
 
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