I got a call from the shop today.
"....Alan, you better come on down, its about your bike.....click"
I was sh*tting bricks, after a miscalculation with my transmission shafts, and having to split the cases a 2nd time, I was worried. Last I had seen the build was Thursday, the heads were waiting to go on. I was worried the custom pistons from CP were going to be an issue. Maybe the cams...too much lift?
Dunno..shrug
I arrive, and my mechanic was all like...you tell him. ...sheepishly walks away, gets the keys, and starts her up. Very easy very fast start...WOW.
It happened so much I wasnt even able to savor it.
I almost cried.
So heres the tech question. While blipping the trottle we heard some pinging..slight but there at around 3k 4k rpm
I know the tech specs of the manual state the advance is
"
5 degrees btdc <1650rpm
30 degrees btdc >3500rpm (USA)
5 degrees btdc <1625rpm
35 degrees btdc >3250rpm (swiss)
5 degrees btdc <1625rpm
32 degrees btdc > 3750rpm (all others)
"
I have new pistons, 12:1 up from 10:1.
Mega cycle cams (shouldnt affect timing, for the sake of this question).
Some transmission work and ported heads.
Its carburated. (before I forget its a 1990 Suzuki VX 800, same engine as the intruder)
My thinking is that the a) gas is old. Its the same gas in the bottom of the tank from when I dropped it off on March 23rd. Old 87 pump gas. b) Although I dont have the pod filters or the exhaust on I yet, I think it may be lean (or at least carbs may be a touch less than clean) ....or at least a lean condition would contribute to a pre ignition issue.
Thought comments???
I wanted to know if there is anywhere I would find an online primer for setting timing advances, as I have a programmable ignition module I am going to install.
Cheers!
Alan
