300/440/550 My '86 JS550

MikeyB

H2O-Addict®
Location
Michigan
Current Mods:

WSM Pistons
1mm Overbore 550 PP Cylinders
Ocean Pro Copper Gaskets
Mariner Head
Kerker Exhaust
Supertrapp Waterbox
Ocean Pro Intake Manifold
SBN 44
PJS Stainless Pickup
PJS Scoop Grate
Extended Stock Rideplate
Skat 15.5
ODI Grips
Tether Faceplate
Hood Straps
Pole Limiting Rope
Pole Spring
PJS Finger Throttle
Quick Turn Plate

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N2 H2O

Previously Tbone550
Location
Charlotte, NC
Nice ski! That pipe looks super short though. I think you would be better of with the stock Jetpower exhaust. Your compression is a little low with that high compression head. Did you just finish rebuilding it? It should be 175-180. If you just rebuilt it, your compression will go up after you run it and break it in.
 

MikeyB

H2O-Addict®
Location
Michigan
Thanks! That compression number was right after I assembled it, to be honest I haven't checked it since then. It runs pretty good for a piston port 550 so I probably won't change anything, I'm hoping I'll get my hands on an FX1 by next season.
 
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MikeyB

H2O-Addict®
Location
Michigan
Ordered a few things today, flow control valve, new lines, msd plug caps w/retainers and then a different style air filter that I'm going to try to use with the 45degree intake manifold. I also decided to pull the trigger on a gopro hero2, thank you visa!
 
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