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175 Posts
HDMD88;
I have an unusual situation with my 1200 (883 conversion) and hope you can help me.
A little background on the motor:
1990 883-1200 conversion with 10/1 comp. and Total Seal "gapless" rings, Thunderheader w/your recommended 'adjustments',
re-jetted CV (45/190 w/DynoJet kit and Yost Power Tube),
Crane Single Fire Ignition and coils.,
Andrews V6 cams (.500 lift / 302 duration),
Crane aluminum adj. pushrods,
SE spark plugs and Accel wires.
It runs very strong, but what puzzles me, is that when I fire it up cold, you can hear very distinct cylinder pulsing from the exhaust, much like a bike with straight pipes (no crossover).
However, after it warms up the idles becomes very smooth, like it has a stock cam! It doesn't seem to affect the power at all, just idles smooth. Any idea what's happening? Thanks for your help.
If anyone else has any ideas, I'd like to hear 'em, too.
I have an unusual situation with my 1200 (883 conversion) and hope you can help me.
A little background on the motor:
1990 883-1200 conversion with 10/1 comp. and Total Seal "gapless" rings, Thunderheader w/your recommended 'adjustments',
re-jetted CV (45/190 w/DynoJet kit and Yost Power Tube),
Crane Single Fire Ignition and coils.,
Andrews V6 cams (.500 lift / 302 duration),
Crane aluminum adj. pushrods,
SE spark plugs and Accel wires.
It runs very strong, but what puzzles me, is that when I fire it up cold, you can hear very distinct cylinder pulsing from the exhaust, much like a bike with straight pipes (no crossover).
However, after it warms up the idles becomes very smooth, like it has a stock cam! It doesn't seem to affect the power at all, just idles smooth. Any idea what's happening? Thanks for your help.
If anyone else has any ideas, I'd like to hear 'em, too.