I have an MK Indy Blade
it has a CBR 900RR Fireblade 918/919CC engine
it pulls really well in first and second, but as soon as I get to about 60-70MPH
it seems to be a little hesitant, almost like a missfire at about 70MPH and doesn't want to pull any more.
I have bought new spark plugs to fit this weekend, and I was going to try and change the fuel filter but the one I have isn't like for like so it
isn't long enough without changing the pipe work.
Any other suggestions?
Try balancing the carbs/TBs.
When I changed the exhaust on mine it had similar issues, have you changed anything, exhaust/inlet as these engines are very sensitive, went from
standard R1 can to straight through, to address i fitted a dynojet kit.
New plugs are also a good start.
Check the plugs before replacing them. Might indicate that one carb has restricted flow.
Many thanks guys.
Runs like a dream up to 75ish so I'd imagine it's only something Small
I will check the plugs tomorrow and see if I can see any evidence of a restrictive carb.