Check your exhaust for a blockage. Did you replace the Power Jet O rings in the bottom of the bowls?

All the information that I have read indicates that the 800 used a black spring. You may want to reach out to the JD Sled Shed FaceBook group.

Yes, there is a difference of the clutches used on the CCW/Kioritz engines and the Kawaski engines. The bore is the same, but the offset is different. Comet 102C Primary Clutch 208306A (Kawi Powered Deere Applications) and has a 30MM shallow taper bore. Comet 102C Primary Clutch 212600A (CCW and KEC...

Check this our from the FAQ section
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I have the same sled an am able to set the carbs as per the Service Msnual. It sounds to me like the throttle cable had been changed sometime in the past and an incorrect cable has been installed.

It depends what you want out of them. The 78 and 81 are 2 completely different sleds. As stock the 81 has more rear suspension and hp. As Matt said, the 78 is more reliable to keep running. I own a 78 and I am not afraid to ride it on long distance trails. The 80 lig I had was a different story. I c...

Yes it is the same.

All great points, it also looks like the right side cylinder is running rich, possibly the spark is dropping out. is the CDI box still the oem Prestolite? . They are know to fail and cross fire. Get an Inline spark tester and check each spark plug with it running. Something else to check is the high...

Did you buy aftermarket needle/seat or Mikuni?

I have used a router and cut a groove deep enough in the wood so the wire is flush with the bottom edge.

PM for instructions to use a multi meter

Possible causing of only only one cylinder spark:
Bad spark plug, stop using surface gap plugs
Bad coil-switch with other side, see what happens
Ohm coils, compare to hewtech specs
Bad timing ring, compare to hewtech spec
Plugs,coils,timing ring good-replace cdi with hewtech fireplug.

Yea, the comcast web site was disabled a few years ago.
On all my 440 engines, the timing was dead on with the stator plate anchored in the center of the slot. Are you sure you have the crank degrees on the correct rotation of before not after top dead center?

Are you checking the timing with a dial indicator and a timing light?

try unhooking the rev limiter.