Hard Starting LF

Spitfire79 · Post by **Spitfire79** » Wed Feb 15, 2006 4:56 pm

I've gotten my 80 LF to the point where it starts although hard, and runs up well as long as the air box is off. When I put the airbox on it seems as if its running way too rich. Hard to start and won't run up. I've soaked the carbs, rinsed them and blew them out with compressed air. New power jets ( 105 & 100 ) new main jets ( 160 ) 3.5 throttle barrel, faxctory jet needle set at second notch from the top. When it starts with the airbox off, there is a slight bog on the bottom end and mid-range, otherwise great. With the airbox it won't run up past 4200 rpm , nor will the clutches kick in. Any ideas? Seems like it suddenly goes very rich.
Thanks
Jeff

Spitfire79 · Post by **Spitfire79** » Thu Feb 16, 2006 2:42 pm

Thanks for the ideas Rich
The chokes seem fine but I've got new choke / throttle cables ordered. The rubbers are good. Are the pilot jets eplaceable on the PJ carbs? They seem as if not. Do I leave the clip on the jet needle set at second from the top if I switch to a different needle? I've synced the carbs as described in the manual, but will do it again after the changes.
When it was running w/o the air box, fuel was spitting out the carbs which leads me to believe that the chokes are sticking. When the airbox is on could it be that the mixture is too rich to start? As it seems the plugs are quite wet.

Spitfire79 · Post by **Spitfire79** » Thu Feb 16, 2006 3:47 pm

In reading the ech section on JDSleds, it mentions the throttle safety switch as being fussy if the throttle cables are not adjusted correctly. What is the procedure to ensure this is correct. Also, the rev limiter seems to give others problems. Mine is unplugged. Can I leave it like this or not? Will it hurt anything?

bob15 · Post by **bob15** » Thu Feb 16, 2006 9:38 pm

Leaving the rev limiter unplugged won't hurt anything unless you over rev it. The pilot jets are replaceable. You might not find a "power jet" in parts manuals, but they are the same as a main jet with the round head. I think I read where it was "old style". On the chokes, they give a number length for adjustment of 32-33mm, make sure it is at least 32mm. Slightly longer is better than too short because it seal the plunger bore and prevent flooding via the choke. Throttle switch works with the rev limiter. I have bought 2 Liquifires which had: one with a wire nut over the wires and the other has the switch just flopping around. Both run fine. I don't believe that to be your problem. Kinda dumb sounding, but is there a mouse nest in the air box or the steel inlet tube? That would restrict air and cause a rich running sled.

Bob