OzVMX Forum
Marque Remarks => Spaniards (Bultaco, Ossa, Montesa etc) => Topic started by: steve234 on January 28, 2010, 05:26:45 pm
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Having problems with my amal carb sticking wide open. It seems to operate normally but on a few occations it has stuck wide open when i've found neutral between 4th and 5th gear. Scary shit i tell ya!
I've been told to ditch it and use a new mikuni but i'd like to use it if i can sort it out.
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Throw it away before you get killed and buy a new one from Burlen Fuel Systems in England. About $200 landed. Cheers Jerry
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Nah, Just keep the forker and use it for Dirt track events ! 8)
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I work on Amals all the time so I have seen this many times.
Depending on how bad it is you can sand out the high spots with 320 wet and dry with a light oil. If its too bad and distorted you wont be able to tune it properly anyway so as the others have said just bin it. Dont bother with Re-sleeve a carb. I used him many times but its now realise its not the best thing to do but before new Amals were being made again, that’s what we all did and had the carbs bored oversize and had SS sleeves fitted. This fixes the sticking for a while but can create other problems. The boring out of the catby makes the flange area weaker and people not in the know over tighten the 2 nuts which distorts the body again when the nuts only need nipping up. Secondly there is no rubber cable boot so water gets into the carby and causes a chemical reaction between the alloy body and the stainless sleeve and this also causes sticking problems again. So I never get Amals sleeved anymore and just fit new ones. The new ones are ok if you adhere to some rules. Don’t over tighten the 2 nuts which distorts the body and fit some sort of rubber boot over the cable or carby top to keep water out. They say the new amals are made from better alloy but they still wont like any moisture. Last of all fit a Mikuni if your not fussed about having a non original carby for the brand of bike you have.
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just to add to the above tip re overtightening flange nuts,pull the throttle till the slides sticks in the top of the carby,then slowly back off the flange nuts till the slide drops,bingo rectified body distortion,correct flange nut tension achieved ;D,(probably best achieved with non running motor ;)) :P
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Thanks guys, sounds like oer tightened flange nuts. Cheers