Originally Posted by AlKay191
these are R90 heads with 42/44mm valves and highly modified intake. I honestly don't know what to expect, but will try to run them with 36mm flatslides off my R100 and 34mm roundslides that I got laying around.
I got a Jap shop with a Dyno around the corner....
Interesting... On my 750 I'm running heads w/ 44mm intake valves and the stock 38mm exhaust with stiffer springs on both sides, and they have been on the flowbench as well. I am running 38m Dell'Ortos, w/ the pumps disabled (AHRMA rules...) I had the bike on the dyno about a month ago and confirmed that the mixture is correct w/ the jets I spec'd, w/ just a slightly lean spot right off of idle.
The bike pulls strong up to 8K RPM, but I have the rev limiter set at about 7500 just to keep the engine internals internal
What size second plug are you running w/ those big valves?? (I can't imagine there's much room in there...)
Let us know what you find out w/ the different carbs.