<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by marvin &raquo;</TD></TR><TR><TD CLASS="quote">Brad, If I'm reading your post correctly I would want to shorten the length of the "lump" on the leading edge the equivelant of 4-6 degrees of crankshaft rotation. while leaving the stock advance for idle?? I'm building up a 94" M900 into a 944 w/JE pistons</TD></TR></TABLE>

if the theory as explained to me of how the boxes work is correct, yes. if you measure the outer diameter of the flywheel, calculate the circumference and then mm per degree and measure the length of the lump it will come out at about 26 degrees. my 600 one did. it's only a theory at this point.

we usually back the timing off 3 degrees at the pick ups, which makes them ok on the best fuel we have. running the -2 degree boxes would help quite a bit, as you only need a small change. the issue is under 5,000 rpm - once over that they're fine.

the pistons i've checked before installation - je, vee two, wiseco - have always been pretty much as stated compression wise.