My 93 FZR 400 RR runs on the stand but loses power and 'conks out' when in gear and ridden.
The power loss increases and it feels like its starved of fuel. eventually full throttle only achieves what appears to be the 'old pre ignition' when engines stutter when turned off.
leave it for a short while start it up and it turns over and revs very high. can get flames from tail pipe.
pup in gear and it starts to conk out almost immediately.
stuff done includes:
- Carbs serviced and all jets as per the manual
- checked exup valve which is free to rotate, tried the bike with exup open and same result.
- new plugs,
- with and without airfilter same outcome.
- coils are as per manual tolerances on electrical resistances.
Have bought new CDI to see what could be the problem.
my view is that the engine may run with weak spark off load but not when on load
if not the CDI then what could this be?