What Keihin in a 501?

the 39mm is well big enough and if there is any gain from the 41mm it will be at the highest revs only and what's the point in that?

i put a 41mm carb on scoots bike and he can't find any change at higher revs at all.

regards

Taffy

i'm impressed actually by the difference dale has posted. that will be a very discernable difference nick. you would feel it as you changed gears and came upon 4, 5 and 6th gears.

note that dale says that both carbs were 'optimized' so it's a valid test.

regards

Taffy

the point is that one often thinks of a big carb giving away power at the bottom but gaining it back at the very top.

this though-is all gain!

the 39 will be a big improvement over the 38 dell orto but not sure about yours which is a 40mm dell. most riders claim it to be smoother, start better, better economy, crisper but in general it's not immediately a faster carb.

when i went to FCR i went from a dell orto that i had done 40+ tests on to 'cooking' jetting just to get me going. if i checked my FCR now against that old dell i would probably describe the bike now as; 'bitchin'!

look for a 41, if you get it-good! but with all the racers around "it's gonna cost you a lot" as berger would say- "but that's only an estimate!"

regards

Taffy

taking it that you have blown your cover by describing the carb as 'dirt cheap' meaning you won't even attempt to make an outrageous profit here at UHE; what did you pay for it and how the hell did you hear about it?

don't tell me! kenny got his insurance come through

now that is funny! one day you need insurance and the next-he has a carb stolen! :twisted: :twisted:

nothing is as cheap as free nick-right?

regards

Taffy