Carb Options an Opinions

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My750GT
Cucciolo - the Lil Pup
Posts: 24
Joined: Wed Feb 29, 2012 2:26 am

Carb Options an Opinions

Post by My750GT » Tue Oct 20, 2015 3:14 am

Hi All,

My GT has AMAL 930 Carbs. They have been a never ending cause of frustration. When my dad restored the bike about 15 years ago he bought a new set of carbs. They worked fine for a while and ended up just like the other sets we have in a box. The bores and slides warp and the rear one never fuels properly without a lot of effort. What is a better option out there? A better AMAL? Dellorto obviously have one for these bikes. Are they easier to deal with? My bike is not used regularly, so granted there would be some issues with old fuel and the like But I just want a bike that I can ride a little more often without the frustration. All suggestions greatly appreciated!!

Thanks
'72ish 750 GT
Functional bitser
Western Australia

Ray O'Donohue
Parallel Twin
Posts: 119
Joined: Tue Oct 13, 2009 8:11 am

Re: Carb Options an Opinions

Post by Ray O'Donohue » Tue Oct 20, 2015 5:09 am

You are going to get a lot of replies to this one! Yes,Amal carbs wear out,etc.Your replacement choices are endless. If you can find a good set of Delllortos from a GT750 or 860,with all the odds and ends,that could bolt right on,you would be very happy with them.You could also go into the unknown areas with Mikuni or Keihin,etc,and any or all of them properly chosen and set up would be fine,but you might spend an awful lot of money and time getting to that point.In general,I would avoid anything larger than 34-36 mm,and try to find an entire set or kit to work with rather than starting from scratch.

Ray O'Donohue
Parallel Twin
Posts: 119
Joined: Tue Oct 13, 2009 8:11 am

Re: Carb Options an Opinions

Post by Ray O'Donohue » Wed Oct 21, 2015 5:07 am

Another thought: why so much trouble with the Amals re "warping"? Too much tightening of the mounts,somehow? We used to buy complete replacement Amals because they simply wore out,for almost nothing.Given the hassle involved with a new brand of carbs,maybe sticking with Amals would be your best bet? Good luck.

Ray O'Donohue
Parallel Twin
Posts: 119
Joined: Tue Oct 13, 2009 8:11 am

Re: Carb Options an Opinions

Post by Ray O'Donohue » Wed Oct 21, 2015 11:23 am

I see that a complete set is available directly from Amal in England,specifically for the Ducati GT750 ,part # PACK129 . I couldn't get the price.

My750GT
Cucciolo - the Lil Pup
Posts: 24
Joined: Wed Feb 29, 2012 2:26 am

Re: Carb Options an Opinions

Post by My750GT » Thu Oct 22, 2015 4:50 am

Yes I've been looking at the new ones. They are about AU$450 for a pair. Ebay has rebuild kits that have just about every part bar the jet for around $60 for the pair. The current carbs are around 14 years old with minimal use. I have straightened and faced the bowl and the base of the slide body. The warping is in the slide tube which doesn't have any forces on it. They are OK for the minute. The main issues I have is that they leak constantly. I've tried adjusting the float and cut new gaskets using thicker material but this has made little difference. These carbs seem to have to be fairly particular in setup to run properly. Too much finessing for me. Tuning I can sort. Its the actual construction that annoys me most.
'72ish 750 GT
Functional bitser
Western Australia

Ray O'Donohue
Parallel Twin
Posts: 119
Joined: Tue Oct 13, 2009 8:11 am

Re: Carb Options an Opinions

Post by Ray O'Donohue » Thu Oct 22, 2015 4:59 am

If the float needle and seat are both metal,you might try lapping the two together with a bit of valve lapping compound. I remember a guy doing that once-don't know how it turned out.

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