Middo wrote:
Checking the head/barrel configuration, I have:
Front Cyl; Head has "KV3L FR2" cast into it; Barrel has "H1" cast in the circle on the bottom left side, is stamped "B" at the back...
I take this as an SP head on an R barrel, not the best setup....But it should be OK so long as I only run high octane premium ULP correct?
The very least you can do is fit a 0.6mm gasket, but I would be more inclined to find an "R" head to bring the compression back in line. Not only is the front cylinder the most susceptible to detonation, but increasing compression on it without using AVGAS or similar is a recipe for disaster. (I.e. I strongly recommend against relying on 97 octane to keep it alive.)
The difference between the respective components is approx 0.2mm, this means an H (SP) barrel fitted with an L (R) head is 0.4mm under spec, approximately -0.8cc combustion chamber volume with standard parts. If the barrel has been replated at some time, then it's possible something has been taken off the deck height, and that will increase the compression yet further!
NSR's don't need high compression to make power (mine's set up at 66hp, and will make almost 68hp with peaky pipes/setup on standard compression ratio and porting), and unless you know exactly what you are doing with the various components, it will ALWAYS be better to run the Honda OEM specification parts.
_________________
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.
Check us out on Facebook! Please "like" our page!