with all the chat about plug chops and getting the bikes flat out.
what sort of size sprockets are people running ?

I know when mine was standard it used to top out at about 112
im running 15 front 40 rear.
what's everyone else got ?

16/36 with an F3 box... about 155mph

Or more often 15/42 with the same box about 135mph
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If I have to take the carbs off once more...

I wouldnt mind trying a 37/38T rear sprocket on my MC21, but where's the best place to get one?

B&C Express do renthals off the shelf in plain alloy or hard anodised.
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If I have to take the carbs off once more...

Yeah, but Steve, that's with 13,000 rpm available, back in normal mortal land 15/39 on my '28 which is 128mph at 12,000 rpm (that's all the rev's I'm going to see), is not quite tall enough at Donington (longest straight I've raced at), 16/39 would make 137mph but it doesn't get there so a 38 is called for.
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Sorry..

On a stock bike I find 15/39 or 15/38 is pretty good on the road. It makes life alittle easyer when your on a fast A road and you dont want to be ragging the thing just keeping up with fast traffic.
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If I have to take the carbs off once more...

And as I'm a big pansey 15/44 (stock '28 ) is fine on the roadbike, it barely gets there anyway with it's 50 something bhp..
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Last edited by fontyyy on Mon Feb 11, 2008 10:04 am; edited 1 time in total

15/42 for fun tight twistys on the road with big wheelies. Biggest track 16/38. Still looking for somewhere to use my 36 @ 13000
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1995 A kit TZ 250
1994 Rothmans NSR 300sp SOLD
1998 RM 250 freestyle/motorcross
1998 Meathanol burning CR 500 AF super retard/motorcross/sand dunes/play bike

14/40 or 14/42 with the F3 box for 125mph or 118mph @ 12,000rpm respectively for me. In this day and age in the UK, where speeding is looked upon by the magistrates as worse than sexual assault, top speed isn't of concern to me.

Currently running 15/40 for 134mph at the moment but it's not convincing me, plus it makes 1st gear a bit of a twat around town as it's good for almost 65mph!
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Andy.
NSR-WORLD.COM

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I'm running a 15/42-43 on my 21. Useless for top speed but great getting there! Still doesn't wheelie like my 60pony 28 did though...
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NSR300R - Why did i ever have a 250...

14/42 with F3 transmission. Same deal as Andy