Quote:
Originally Posted by Jez900ie
I must say I am impressed at 4 or 5 hp increase by changing air filtration.
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Problem was that it lost power with the filters fitted and I couldn't run without as the vertical cylinder carb intake is directly behind the rear wheel and facing forwards!
It appears that the filter was affecting the way the air flows around the intake stack. I have since fitted longer stacks with K&N filters which definitely filter better and although I've not re-visited the dyno I think I have improved things (also changed the exhaust pipes at the same time) but even if it didn't I can't run without filters.
An airbox would eliminate the disruption caused by the filter being in contact with the stack/intake and a bigger airbox would (likely) more closely replicate running without filters.
Certainly on race bikes they used to fit larger airboxes, along with other 'stuff' to make more power although the gains are likely to be very small...