Page 1 of 1
kr1 barrels on kr1s bottom end
Posted: Sun Nov 16, 2014 8:56 pm
by 2stinker
hello again, can anyone tell me how much bhp i would lose running kr1 9 port barrels, instead of the 8 port 1s barrels, but still using the 1s exhausts, as i have a decent set of kr1 barrels, but the 1s, one,s need re-plating and funds are at an all time low for now, must be a few people on here who have run them on 1s pipes, and would i have to run them with the kr1 powervalves, any info much appreciated, thanks guys!
Re: kr1 barrels on kr1s bottom end
Posted: Sun Nov 16, 2014 9:09 pm
by Luders
I would guess at around 5%
Re: kr1 barrels on kr1s bottom end
Posted: Sun Nov 16, 2014 9:24 pm
by 2stinker
thanks, thats off a 65bhp kr1s engine, so around 3.25bhp?, and i assume i could pull some of that back by matching the barrels to to the cases an cleaning up the ports, and mabey flow the cases? cheers!
Re: kr1 barrels on kr1s bottom end
Posted: Sun Nov 16, 2014 9:30 pm
by Luders
Jeez I've never seen a 65bhp KR-1S engine
In real money, probably 2.5bhp
Re: kr1 barrels on kr1s bottom end
Posted: Sun Nov 16, 2014 10:03 pm
by 2stinker
my mistake, 55bhp engine, if only!, drink-typing very dangerous! must stay off evilbay tonight!
Re: kr1 barrels on kr1s bottom end
Posted: Sun Nov 16, 2014 10:17 pm
by Luders
I'm aiming for 65-67 on a dynopro, but the highest I've seen is 62.5 from Mark Jordan's engine.
The ports on the KR-1 barrel are smaller, which is where the loss comes from. If you work the ports, they can probably be as good. Not sure if that extra boost port has a negative affect though.
Re: kr1 barrels on kr1s bottom end
Posted: Mon Nov 17, 2014 8:26 pm
by gary
Ben wrote he never seen a 65hp kr1s, but my bike was in the same line up as his at japfest , but use,s big bore kr1 barrels.
Re: kr1 barrels on kr1s bottom end
Posted: Mon Nov 17, 2014 10:35 pm
by JanBros
gary wrote:Ben wrote he never seen a 65hp kr1s, but my bike was in the same line up as his at japfest , but use,s big bore kr1 barrels.
I'm sure Ben means a 250cc KR. It would be the same as claiming one has a 140BHP RD350LC while it might actualy be a 500+ RD
Re: kr1 barrels on kr1s bottom end
Posted: Tue Nov 18, 2014 9:23 pm
by Binetta Steve
gary wrote:Ben wrote he never seen a 65hp kr1s, but my bike was in the same line up as his at japfest , but use,s big bore kr1 barrels.
AND was built by KR1 Sensei Martin!! Top man.
Nuff said.
Steve
Re: kr1 barrels on kr1s bottom end
Posted: Sun Dec 28, 2014 5:47 pm
by 2stinker
also if im running the kr1 barrells with 1s pipes on the kr1s bottom end, should i run a kr1 cdi as it seems the obvious choice, but id rather ask the experts as im sure theres a twist, there usually is! lol
Re: kr1 barrels on kr1s bottom end
Posted: Sun Dec 28, 2014 9:03 pm
by Luders
Do you have a KR-1S CDI?
Re: kr1 barrels on kr1s bottom end
Posted: Sun Dec 28, 2014 11:54 pm
by 2stinker
yes just the kr1s one at the moment!
Re: kr1 barrels on kr1s bottom end
Posted: Mon Dec 29, 2014 7:37 am
by Luders
Use that, it will work better with the pipies
Re: kr1 barrels on kr1s bottom end
Posted: Mon Dec 29, 2014 9:13 pm
by 2stinker
thanks for that, saves me a bit more cash,