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Working on an ‘81 Panther with the 440 fan. Sled’s in great shape @ < 400 original miles. Bogged when I first purchased/ran it. Oil injection check valve appeared to be bad/flooding case with oil, so disengaged linkage to carb/ran pre-mix and replaced fuel lines, pump, cleaned tank/carb, and some minor touch up - usual stuff. Now it won’t even fire. Both cylinders have 130+ lbs (haven’t done a leak-down, but bad seals shouldn’t cause this…?). Had to adjust TSS, but it’s fine and have good/solid spark on both plugs when grounded to fan shroud. Pump is pushing fuel and cleaned carb looks good (float/needle/jet/Venturi all appear to be fine). Even with a little fuel in the cylinders and starter fluid through the intake (which is clear), not even chugging/firing at all. Never had this issue with a sled that had air/compression, fuel, and spark. Wondering about a timing issue, but haven’t done anything to impact timing from the original issue, where it ran, just bogged at higher rpm. Would really appreciate any input/thoughts…., Thanks.
 

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Try unplugging the main 4 wire engine harness and jump the brown and black wires together. This will bypass the sleds entire wire harness leaving it to run on just the engine side of things (pull the jumper to kill the engine). If it runs fine by jumping it then I'd suspect your going to be tracking something electrical on the sled side, if you have the same results then maybe something fuel related, mechanical, or electrical on the engine side (coil, cdi, etc)...but by doing this test you can start to narrow things down a little.
 
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