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Old 18-07-07, 11:16 AM   #3
rictus01
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Join Date: Jul 2003
Location: South London
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Default Re: Exhaust Questions

Generally speaking you need to have the jets filter and exhaust in balance, filters come in three main flavours, standard (or replacement for standard), slightly freer flowing and race (as in BMC terms road/race & race RS)

using the above as a guide, your jets may have been setup for the headers and perhaps a full micro system at some point in the past and used a race or race RS air filter then (probably removed when the bike was sold), in which case a race or race RS filter would be required to balance out the mixture ( although I'm not sure how restrictive you road legal can will be, as I'd suspect the race version was also removed before sale, so you'd need a race on of those).

Jet's require stripping the carbs to change so were probably left as were the headers, the standard air filter and end can aren't suited to them as you have it now.

you could find out the jet size and then change the rest to suit it or perhaps the best way would be to fit a set of standard jets as they should work fine with what you already have.

Cheers Mark.
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