Subtopic	Posts		Updated
	Archive through July 20, 1999	2

By Terry Simpson on Unrecorded Date: Edit

Hey Guys,
Anybody know why my carborator leaks gas out the intake when my JLO is'nt running?

Terry

By liflod (Liflod) on Unrecorded Date: Edit

Sounds like the float/ needle valve seat isn't seating.

By ISAAC EISENMAN (Tropicjungleboy) on Unrecorded Date: Edit

HEY TERRY:

sound like the needle level is "too low" and allow gasoline to get thru...you have two choices:

a) if your engine works great and the only problem is the gas leak thru the ventury just close the gasoline valve that should be located between the gas tank and the engine before stop this engine or
b) disasemble the middle part of the carburator and adjust the bellcrank that support the needle...the "proper gap" is that the oposite side of the bellcrank get "flat" with carburator's body......be prepare to replace all membranes on carburator since time and heat make them useless after open it.........

By Terry Simpson on Unrecorded Date: Edit

Thanks for the replys,but I have a Tillotson HR on my JLO 297ccm.
It has no floatbowl, just metering diaphragm, it leaks gas out the intake venturey when idling and when not running,also runs rich even with the needle valves closed. I just bought this carb from central snowmobile its a rebuild. I was thinking maybe the return elbow is restricted to much causing a backup pressure. The return line is not pluged. I don't want to burn up my Max.
Terry

By John Kevin Maiolo (Johnmaiolo) on Unrecorded Date: Edit

I have the type of carb you just described on my Terra Tiger JLO 292. Mine doesn't have a return on it however, my amphicat does. Sounds like you have it nailed down, if the return line to the tank isn't plugged, it could very well be in the elbow or carb itself. Was a new carb gasket installed, and does your carb get crankcase pressure feed from a hose or through a passage in the head through the carb gasket? I would contact central snowmobile.

By ISAAC EISENMAN (Tropicjungleboy) on Unrecorded Date: Edit

HEY TERRY:

check again my last post about this topic.....i refer exactly to the kind of carburator that you describe.....you need to adjust the needle valve that performances via a bellcrank that moves with the metallic point attached to the diaphragm (center section of carburator......)also check for the return line flow (cleaned/tested with compresed air)...(you should get "free flow" from intake port) and restricted flow from return port...no more than 10 p.s.i on test or diaphragm burst posibility...you shouln't hear "air leak" thru ventury with vacuum/pressure port disconected...and you should hear "air leak" on ventury with pressure activating the diaphragm

By Terry Simpson on Unrecorded Date: Edit

Thanks, I will try that.
Terry

By roadwolf on Unrecorded Date: Edit

terry, if you take off the stack, to adjust or inspect the fulcram arm, check and make sure there is a small welch plug installed over the pick off nozzles that pass into the venturi. if that plug was not installed when being rebuilt that would explain why the fuel is still goin in to the carb with both fuel mixture valves shut completely off.

By larry swisher on Unrecorded Date: Edit

help ineed ring and piston for 295 jlo