This guy is onto something! Very good observation! While the OP is at it, he might want to get in touch with ARC, as there was a model change on the static flywheel; they now have advanced timing built in.
they did?.. didn't know that, I thought it's still the same as stock..
good to know.
The flywheel is just the standard flywheel non adjustable timing. The timing key is stock as well.
In that case, maybe a small timing advantage will help;
that is if you fixed your gas issues, and made sure this is not valve flutter already.
At one point it is necessary to advance your timing a little to raise the rpm, (I'd suggest a small number 4° maybe 6°)
too much and it's more likely to shear the timing key and you loose too much torque on lower rpms.
on a clone the mod2 cam is supposed to be run with 26lbs springs AFAIR, and since the predator is basically a clone, I think you can apply the same rule here.
This is where I would start to make sure it's not valve flutter,
if that doesn't help to raise the rpm, get a timing key.
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EDIT]
Looking at the ARC website, the std flywheel now comes with 8° advanced timing,
so if you bought the flywheel just recently (I don't know when they changed that) there is no need for a timing key,
quite the opposite, I wouldn't recommend using one!!
'sid
