IceRocket1286
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- Location
- Metro Detroit
I am helping someone with an SXR and I do not recognize this flywheel. He has burned a hole in the front piston right under the plug likely due to detonation, probably too low of octane, maybe too much timing advance. Tearing it down for a rebuild. Unfortunately this ski is new to him and this was tank #2 of fuel.
Humor me, can a lightweight flywheel contribute to an increased risk of detonation? I’d say no, but I’m curious as to what others think. Maybe this is far fetched, but are some aftermarket flywheels advanced from their manufacturer? It’s just a thought that popped into my head when I didn’t recognize this flywheel. The magnets would still be 180 degrees apart, but maybe their position on the flywheel is already advanced.
I won’t be able to get my eyes on this motor until the weekend, I plan on seeing if the CDI is stock or aftermarket as well.
Ski info:
2004 SXR 800
Factory Wet pipe - dual cooling
ADA Racing head - 28cc domes - 165/165 PSI when purchased a few weeks ago
V force 3 Reeds and spacers
OEM carbs jetted with tornado filters
RD pump stuffer cone
Motor has been rebuilt before, it has a Hot Rods crank, yuck!
Leak down test : motor held pressure, no air leaks.
All other parts assumed to be stock at this time.
He ran 91 or 93 octane, I forget which. This ski is just like identically built skis in our group, except they have 30cc domes and an OEM flywheel. They also are running around 175psi and no detonation issues. Obviously gasket height and other things play a factor in this, we are just getting started trying to sort it out and get all the details.
Thanks for any information provided!
Humor me, can a lightweight flywheel contribute to an increased risk of detonation? I’d say no, but I’m curious as to what others think. Maybe this is far fetched, but are some aftermarket flywheels advanced from their manufacturer? It’s just a thought that popped into my head when I didn’t recognize this flywheel. The magnets would still be 180 degrees apart, but maybe their position on the flywheel is already advanced.
I won’t be able to get my eyes on this motor until the weekend, I plan on seeing if the CDI is stock or aftermarket as well.
Ski info:
2004 SXR 800
Factory Wet pipe - dual cooling
ADA Racing head - 28cc domes - 165/165 PSI when purchased a few weeks ago
V force 3 Reeds and spacers
OEM carbs jetted with tornado filters
RD pump stuffer cone
Motor has been rebuilt before, it has a Hot Rods crank, yuck!
Leak down test : motor held pressure, no air leaks.
All other parts assumed to be stock at this time.
He ran 91 or 93 octane, I forget which. This ski is just like identically built skis in our group, except they have 30cc domes and an OEM flywheel. They also are running around 175psi and no detonation issues. Obviously gasket height and other things play a factor in this, we are just getting started trying to sort it out and get all the details.
Thanks for any information provided!