the class im going to be raciong in doesnt allow for any exhaust mods and the only mod i can do to the airbox is remove the filter. i have a hrc card and a hrc jet kit on order and was wondering what would be the best carb set up. im also going to be running it on pre mix.
You're bolloxed then! The airbox is way restrictive, and needs 2~4 20mm holes cut in it to allow sufficient breathing, however... what about an HRC SP airbox? Surely that's not cheating?! _________________ Andy.
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guess im knackered then, il be starting has a novice but rules are rules i guess, maybe il have to get another bike, is there anyone out there racing has a novice that could give me a bit of info on what can be modified and what cant,
There are a few NSR's being raced this year but all with DP in F250 where we can mod till we run out of money, which for some of us is before we start lol _________________ If I have to take the carbs off once more...
At the end of the day, if you are a novice, then I guess it won't really matter too much for now. The most important thing will be to get out there and enjoy it. Going fast will come later.
Where are you based? Some dyno time will be invaluable. I wouldn't like to guess what is available with a stock airbox lid, but we'd certainly like a go with it! _________________ Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
based in beverly,east yorkshire,been riding on road for a few years but feel the need to race.just a shame about the rules,im old enough to race a 1000 but yet i cant do a few mods to a 250,rules are rules,end of the day i either stick to em and race or dont race,or get something less restricted,
To be fair, my '28 on stock pipes (mine have no restriction in nor sign of it having ever been removed and I'm not alone in this, if your's have get the Dremel on it!) and airbox, c/w HRC card and jetted too rich ran round Donington in the front half of the fast group, a girl there timing us only timed me one lap and I wouldn't have been anywhere near last in the F250 (and thats taking my one lap against the best race lap times from DP F400 last year), I was only a fraction behind Billy and he was running top 5 (in F250) pace.
OK so we know Donington pretty well but even so, I wasn't getting blown away by anything, least of all bikes with just a couple more bhp.
There's a lot less in it than many would have you believe, a couple of KR's here struggle to top 60hp, a std RGV250 or (Aprilia) RS250 is even worse, all the fast boys are running interesting carbs, heads, ignitions, pipes, fuels etc.
The below settings are for reference only, always check your own jetting
Std pipes, std airbox, std gearing, Donington Park, very hot dry UK day, mid 90's*f, I ran middle of the B needle, 182, 188 and it was too rich, still too rich in fact with the airbox opened up.
With the std airbox I'd guess mid 50's hp, it'd give a std 400 a run.
And get all the road kit off, theres a ton of weight to be saved! _________________ Please do not PM me technical questions, if you can't find it on the Forum start a thread
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