First things first here are the mods:
14cc head
milled .030
.010 head gasket
ported and polished
27mm & 25mm ss valves
Locks and keepers
1/4" pushrods
Champion shaft rockers
50# springs
Black mamba cam
Arc rod and flywheel
12° timming
Flat top piston
22mm Mikuni no air filter
Running turbo blue
So here's the problem, bike ran great for about 30 passes the last 3 it started to break up off the line. Not real bad just one little "miss", couple weeks later it was a little worse but seemed to get better by richening up the low end screw. Then today it was real bad breaking up for the first half of the 1/8. I check the lash and change the oil before every race and have not changed anything else. Here are my 2 ideas, there is a piece of dirt in the carb or my coil is taking a crap. I'm pretty good with these motors but looking to do some brain storming with you guys. I did check the plug and it was a little rich but the idling down return road at the strip may have skewed that. It was was spinning over 8k in the 1/8 now it only turns about 6500. Engine idles great and will rev up nicely on the stand but under load is when the trouble begins.
Any of you high performance guys have any thoughts.
14cc head
milled .030
.010 head gasket
ported and polished
27mm & 25mm ss valves
Locks and keepers
1/4" pushrods
Champion shaft rockers
50# springs
Black mamba cam
Arc rod and flywheel
12° timming
Flat top piston
22mm Mikuni no air filter
Running turbo blue
So here's the problem, bike ran great for about 30 passes the last 3 it started to break up off the line. Not real bad just one little "miss", couple weeks later it was a little worse but seemed to get better by richening up the low end screw. Then today it was real bad breaking up for the first half of the 1/8. I check the lash and change the oil before every race and have not changed anything else. Here are my 2 ideas, there is a piece of dirt in the carb or my coil is taking a crap. I'm pretty good with these motors but looking to do some brain storming with you guys. I did check the plug and it was a little rich but the idling down return road at the strip may have skewed that. It was was spinning over 8k in the 1/8 now it only turns about 6500. Engine idles great and will rev up nicely on the stand but under load is when the trouble begins.
Any of you high performance guys have any thoughts.
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