77 liquifire

[400brian]

Regarding the speedo issue. I believe the problem is this: The angle drive on the mid-mounts is located on the right hand side of the machine. Looking at it, the track is turning clockwise to it. On the Cyclones and Liquifires (which has a jackshaft), the angle drive is now on the left hand side of the tunnel. Looking at it, the track is now turning counter-clockwise.

The 73> mid-mounts used angle drive AM52344. The 76 - 78 Cyclones and Liquifires used AM533554, which then subbed to AM55301.

The spitfire angle drive was AM54659 or AM54654, depending on which track drivers were installed. The Spitfire speedo drive was mounted on the right hand side of the machine, so it turns clockwise, the same direction as the mid-mounts, but I suspect the gearing would be wrong. A Spitfire drive I have on hand says 2:1 on it, but no part number.

So to prove my point I looked up the part numbers for the speedometers on the sleds I've discussed here. The mid-mounts and the Spitfire used the same speedometer, AM52343 which then subbed to AM55099. The Cyclones and Liquifires used speedo AM53863.

I have often heard it said that the Spitfires used a reverse rotation drive, but it appears that is only correct if you are comparing it to the Cyclone and Liquifires.

So, it looks to me that you need to obtain an angle drive for Cyclone or Liquifire.

[Popcorn popper]

Thanks Brian. I contacted a wrecker he has couple I’ll go look at.

[Matt]

Brian's right - it looks like every JD with a crossover jackshaft used the same speedometer drive, so that includes 80+ Liquifire, Trailfire, Sportfire too.

[Popcorn popper]

Guys i was playing with sled today. Seems quite lazy on bottom end. I wound up secondary spring a bit and then added a little stiffer spring. Marginally better.I have no idea how peppy these were from start. Once rolling seems pretty lively. Im thinking the jdx8 give it bad time to about 40-50 mph. Whats your thoughts? It was +6 celcius today. 43f*

[Popcorn popper]

Also is there aftermarket gearing available for these? I ordered some goodies from Matt today never paid attention to gears tho.

[400brian]

Have you been inside of the clutch? Wondering what it had in it for arms? The 76s had "F" arms, then over 70K they ran "R". Just to establish a baseline. I have no idea why they changed them, I don't believe they appear much different.

[Popcorn popper]

I bought a brand new clutch. I tried a little different ramp as i couldn’t get new r ramp as none in stock. I had one original r ramp with grooves from a bad roller. I also installed the next stiffer spring above black. However still
Quite lazy. I then repaired the r best I could and installed with black(stock) spring. That was actually worse. Then i put in heavy spring. After that it seem better. I
Actually cranked up secondary pressure also. Its better but no barn burner out of hole. Id say once it hits 20-30 mph takes off good. It was warm and i never did check jetting. Maybe a tad rich.

[Popcorn popper]

Would these sleds spin hard from stop or not really?

[jep_800]

Temp could be an issue, so it might be in your jetting. I had a bog situation on my mid-range (Cyclone) and it turned out that I had to lean the air screw some to get that to go away. It should be in your pilot circuit someplace, as you're talking about from 0 - 1/4 throttle.

I'm not too sure about the Liquifires, but we just found out from an oval racer that the pipes on these sleds (particularly the Cyclone) exert a certain amount of back pressure... something to do with the proper pressure wave to push the fuel/air mix back into the cylinder. If that bleeds off, you can't get consistent power. So, the pipe to Y-pipe must be snug (not loose), and the pipe must be hot to get the proper power. I've experience this personally with mine. It's sort-of doggish when the engine and pipe are cool, but once it's up to operating temps, she takes off beautifully.

I will say that when the jetting is correct, and the right amount of heat is in the engine and pipe, they fly! There shouldn't be any lag when you hold it to the bar. It should dance the skis from a dead stop.

Jason

[Popcorn popper]

Ok I’ll go over everything. Its pretty sad on bottom. But still going through first part of oiled up fuel

[Popcorn popper]

Well got it figured out guys. The belt deflection was way to loose. When the clutch slammed in it pushed the belt up and the sled was actually trying to start in higher gear so to speak. Once i got that sorted out I bumped spring pressure up. She wails now lol.

[Popcorn popper]

Thanks for all your help guys.

[Popcorn popper]

Guys i found a parts sled. It doesn’t have the cooler under hood for engine. Was this a option. Its the second one I’ve seen this way.?

[jep_800]

Glad you got that figured out!

I’m not an expert on the Liquid sleds, so someone else would have to comment on that.

[Popcorn popper]

Ok thanks Jep 800. I was just surprised this one an one other that I missed was rad less.