Keihin fcr 41
08-24-2011, 01:17 AM
#31
Out of my mind, back in 5
MotoGP
Join Date: Nov 2006
Location: Skurup, Sweden
Posts: 6,109
Well all dyno's read different and I would think the one he is using is a bit on the optimistic side......
as it sounds like he did a pretty basic Stage 1 build. So I would say somewhere in the 120's true but that is just my opinion and I've only been messing with these bikes for a little while....
The only real thing I would add is, if you are running the bike with just the stacks, your engine isn't going to last very long. You need some kind of filter or the engine will be trashed in no time flat.
as it sounds like he did a pretty basic Stage 1 build. So I would say somewhere in the 120's true but that is just my opinion and I've only been messing with these bikes for a little while....The only real thing I would add is, if you are running the bike with just the stacks, your engine isn't going to last very long. You need some kind of filter or the engine will be trashed in no time flat.
About those numbers... I know form experience that the VTR has about 9-10% losses from the drivetrain to the wheel... So calculating with that, to get 156 bhp at the wheel, that engine would need ~175 bhp at the crank... That's simply not possible with or without a FCR's... Unless you are running a modified block, crank and a lot of other stuff... (Or perhaps, you could get it to that point, but then it's only a matter of time before it grenades on you...)
The most anyone have been able to reliably get out of an unmodified block & crank was around 150-155 at the crank... Which would then translate to just under 140 at the wheel...
I'm not saying your bike isn't pushing 156 bhp... I'm saying it's rather more likely that the dyno is optimistic... So if you want us to believe you, post a complete and comprehensive list of mods...
As for the clutch slippage... You already have aftermarket springs and plates in there right? And the plates are in absolute good good condition, not "good enough"? If so, I'd suggest new plates, and perhaps swapping for even sturdier springs and as a worst case scenario, shoehorning one single thicker plate in there... I'm running 120+ bhp at the wheel, and I had to work a little to make the clutch behave itself...
08-24-2011, 10:00 AM
#33
Senior Member
SuperBike
Join Date: Sep 2008
Location: Essex, UK
Posts: 1,707
As a benchmark...
Revolution Racing - UK (Roger Ditchfield)
Untitled Document
Home - Yellow Camel
Factory Moriwaki Stage 3 Superbike Endurance racer
Race Bikes
Revolution Racing - UK (Roger Ditchfield)
Untitled Document
VTR1000F Stage 1A to 3 110 – 150 BHP. A truly great riding experience. The Stage 3 was raced by Mark Ditchfield and “guest” raced by Gus Scott in British Superbikes. This was reported in Performance Bikes as ‘a fantastic ride’. This is truly a great bike.
Factory Moriwaki Stage 3 Superbike Endurance racer
Race Bikes
08-25-2011, 03:21 AM
#36
Out of my mind, back in 5
MotoGP
Join Date: Nov 2006
Location: Skurup, Sweden
Posts: 6,109
08-25-2011, 11:46 AM
#38
996
Squid
Thread Starter
Join Date: Aug 2011
Location: Athens greece.
Posts: 20
Guys there have been so many mods on the bike that i don"t even remember.
There was a crank balance and lightnening, flywheel also.Some other things in the case. Gasflow work in the heads, je pistons high compression, changed cams , don't remember what, oversized valves, and changed rods .Barnet clutch springs and discs.
Apart from the fcr"s and remus cans plus dyna ignition coils, and a different cdi unit.
There was a crank balance and lightnening, flywheel also.Some other things in the case. Gasflow work in the heads, je pistons high compression, changed cams , don't remember what, oversized valves, and changed rods .Barnet clutch springs and discs.
Apart from the fcr"s and remus cans plus dyna ignition coils, and a different cdi unit.
Last edited by jomark911; 08-25-2011 at 11:54 AM.
Thread
Thread Starter
Forum
Replies
Last Post
