340 Trailfire help

[zr870]

Hello out there…..can anyone tell me what the stock gearing for this sled is….also are the clutch’s from a 440 and 340 both primary and secondary the same meaning weights and spring along with the exhaust…..reason I ask is picked up a barn find 81 or 82 LX …which should of come with a 440 motor
Any help would be great…

[AirborneX4Special]

What year 340? Gear ratios are model year dependent along with the clutches. The LX first arrived for 1982 with 1981 build dates stamped on the tunnel.

[zr870]

The chassis is an 82 but that’s the issue I have not knowing the year of the motor….gearing in the sled now is 21/39
Center to Center on clutch’s looks to be 11 5/8 or 9/16
Don’t know if that’s right or the offset….or if the clutch’s are even from a 340…..any help is what I’m after …thanks for you replying

[tmartin]

vintagesnow.com has all the technical manuals for these sleds. I would clutch, gear, and jet it according to like a 1982 and it should run fine as long as airbox is in place. They have information for aligning motor and clutches in there as well. Very valuable site for the vintage sled world.

[zr870]

Hey thanks a lot
I will check it out ….

[zr870]

Just went to vintagesleds and nothing I can see for John Deere

[AirborneX4Special]

Trailfire Parts Manual Screenshot

[zr870]

So gearing looks right…
Clutch weights say U on them …tan or gold spring
Just working on taking secondary apart

[AirborneX4Special]

Primary clutch a Comet 102?

[AirborneX4Special]

Primary Schematic

U cam arm is indicated with silver spring

[zr870]

Yes the primary is a 102…..the weights are 61 grams

[AirborneX4Special]

It appears you have most of the correct parts.

[zr870]

Thanks Airborne ….I was finally able to track down the Center to Center on the clutch’s and looks to be 11 1/2” or 291-2 mm…

[AirborneX4Special]

Happy to help....