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R1 rev limit ???
big_l - 25/6/10 at 10:17 PM

Anyone got a rough idea what the rev limit is On a r15jj and does it need reducing when fitted to a 7 !!!

matt_gsxr - 25/6/10 at 10:49 PM

rough idea, 13750rpm. and no. Most folk just transplant as much as possible.

EDITED TO SAY, this is not true!!!

[Edited on 26/6/10 by matt_gsxr]

james h - 25/6/10 at 10:57 PM

12,500 on mine from memory

No need to reduce it at all

[Edited on 25/6/10 by james h]

A1 - 25/6/10 at 11:48 PM

its 12150 on 5pw
no redusing necessary

dazzx10r - 26/6/10 at 12:22 AM

12,000 rpm, but don't go past 10500 as thats when they stop making thier power, and you're only putting uneccasery strain on the engine, and I've seen my fair share of R1 motors go pop from my racing days, they usually snap a conrod or jump teeth on the timing chain as the chain tensioners are a bit weak.

big_l - 26/6/10 at 06:59 AM

i thought that with it pulling a heavier car it would put alot of strain on the crank!!

how many miles will the engine last !!!

i just ran my car at newark show for its first time and it sounds like its done a big end also there is rather alot of copper filings in the sump?

and im of to collect another engine today and dont fancy breaking this one before the iva lol

progers - 26/6/10 at 09:32 AM

quote:
Originally posted by matt_gsxr
rough idea, 13750rpm. and no. Most folk just transplant as much as possible.


Incorrect. For a 5JJ its just under 12,000. You don't need to limit this in a car but as peak power is around 10,750 you might as well change around 11,000 (when pressing on) and save the strain on the engine.

- Paul

mark chandler - 26/6/10 at 09:39 AM

Sounds like the bike was crashed and laid on its side running or you were just sold rubbish!... its a PITA when someone sells you junk.

That aside the engine, gearbox etc are all designed to take the same load, it makes no difference car or bike as long as you get it cooled and lubricated properly in this respect.

As the drive train is harder the shock loads are a bit higher.

Regards Mark

Steve Hignett - 26/6/10 at 09:46 AM

Did you build or buy your Locost? Any pics?

jack_t - 26/6/10 at 12:57 PM

11750 on 5jj r1 clocks

big_l - 26/6/10 at 10:59 PM

Fitted the new engine today maneged to find a 5jj for £450 with 6k on it it looks like new .. The only thing is it's not been ran for 5 years the bike breaker went bust and the new guy has only just bought all the stock from liquidators I'll just have to see how long it lasts !!!! Ive got pics but nit sure how to post them !!!!