I just threw my bike on the dyno for the first time since fixing the motor and once i hit around 9000 (maybe a bit before) it starts missing, its not the rev limiter but is distinctly cutting out. I would have never noticed this riding it cause i never rev it out that far, but it didnt do this before so im wondering what it is. I just installed a new stator and plug cap, could the ignition timing have anything to do with it?
i dont wanna, its making less power than before, kinda hoping this is related. I only have it up to 49.6, it was 51.1
Joined Jun 2001
1K Posts | 3+
Berkshire, England
I hope not, but you may be in for a nasty surprise 
You need to test it but if the bike continues to cut out at high revs and high load it's probably the ignition coil that needs replacing.
Obviously make sure the obvious is checked first but as long as you don't notice, it shouldn't be a problem ?
Cheers,
Simon
You need to test it but if the bike continues to cut out at high revs and high load it's probably the ignition coil that needs replacing.
Obviously make sure the obvious is checked first but as long as you don't notice, it shouldn't be a problem ?
Cheers,
Simon
Joined Jul 2001
3K Posts | 1+
El Sobrante, Ca. 94803
Hi Dave,
What exhaust system and type of end cap are you using?
what is your current A/F ratio at peak rpm?
What are your current carburetor specifications?
Keep in mind that the A/F ratio travels rich above peak horsepower rpm.
Please send a run data file and / or dynamometer graph (HP / TQ Vs Engine rpm) and I shall try to assist.
[email protected]
Best Regards,
Dale
What exhaust system and type of end cap are you using?
what is your current A/F ratio at peak rpm?
What are your current carburetor specifications?
Keep in mind that the A/F ratio travels rich above peak horsepower rpm.
Please send a run data file and / or dynamometer graph (HP / TQ Vs Engine rpm) and I shall try to assist.
[email protected]
Best Regards,
Dale
Dale, i will work on getting our O2 sensor to work on these single cylinder bikes. We have a cheap dyno and they intend you to weld a bung in the pipe (the best way, but im not gonna do it) we have an exhaust clamp they sent, but it relies on a venturi effect and the single cylinder sucks fresh air back in the exhaust and it just doesnt work. here is what is in the carb right now:
200 main
33 pilot
51 needle in 2nd position
I have a Big Gun exhaust with the wide open core and cap, no spark arrestor.
I also tightened up the gap on the plug, and it seems to have helped but i dont have it on the dyno anymore so i cant tell for sure.
200 main
33 pilot
51 needle in 2nd position
I have a Big Gun exhaust with the wide open core and cap, no spark arrestor.
I also tightened up the gap on the plug, and it seems to have helped but i dont have it on the dyno anymore so i cant tell for sure.
Joined Jul 2001
3K Posts | 1+
El Sobrante, Ca. 94803
Hi Dave,
That combination should prove good through 8500 rpm (peak horsepower rpm) providing you have a good air filter, are near sea level and ambient temperatures are below 100 degrees.
Try operating the engine into the misfire rpm zone @ well below W.O.T. If the misfire is is still present you may be experiencing valve float and / or bounce.
Have you done any valve work?
What is your installed spring height?
Peak RWHP should be roughly 53.
Best Regards,
Dale
Ps
Use an accurate tachometer as the X1 camshaft will allow the engine to pull well beyond it's safe limits.
That combination should prove good through 8500 rpm (peak horsepower rpm) providing you have a good air filter, are near sea level and ambient temperatures are below 100 degrees.
Try operating the engine into the misfire rpm zone @ well below W.O.T. If the misfire is is still present you may be experiencing valve float and / or bounce.
Have you done any valve work?
What is your installed spring height?
Peak RWHP should be roughly 53.
Best Regards,
Dale
Ps
Use an accurate tachometer as the X1 camshaft will allow the engine to pull well beyond it's safe limits.
Im at 2300 ft, it was 63 degrees, i was using an un oiled stock air filter. I haven't done any valve work at all, its all stock. the tach i am using is the inductive pickup unit built into the dyno. I will try the part throttle trick, i have a feeling it wont do it then.
Thanks,
Dave
Thanks,
Dave
Joined Jul 2001
3K Posts | 1+
El Sobrante, Ca. 94803
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