EX­PERT’S GUIDE TO... CARBURETTORS

Old bikes are lovely – but worn or ne­glected carbs can drive you nuts. Here’s how to sort them out

Motorcycle News (UK) - - Garage - Steve Pan­ter

Steve has run af­ter­mar­ket carb spe­cial­ist Al­lens Per­for­mance (al­lensper­for­mance.co.uk) for 10 years. He is a mine of tech­ni­cal ad­vice, and also an ex­pert on two-strokes. Think of your car­bu­ret­tor as hav­ing a big pond of fuel at at­mo­spheric pres­sure. At the top you’ve got air flow­ing into the en­gine through a re­stricted di­am­e­ter, so that re­duces pres­sure, be­cause the air has to in­crease the speed to main­tain the flow. This causes fuel to flow from the bot­tom of the carb, through the jets, to the top. That dif­fer­ence in pres­sure is what we call the sig­nal strength. The trick is to get a sig­nal with­out re­strict­ing the flow of the air too much. The flat slide CRFS, TMRS and FCRS we sell are ba­si­cally as far as de­vel­op­ment went with the mo­tor­cy­cle carb. Their very short ven­turi give the max­i­mum sig­nal strength for the min­i­mum dis­rup­tion.

Th­ese flat slide FCRS are ba­si­cally as far as de­vel­op­ment went with the mo­tor­cy­cle carb Carbs of­fer perfect fu­elling… but only when they are in good nick

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