1978 340 Liquifire choke plunger

General topics related to John Deere Snowmobiles
Post Reply
liquifire340
Posts: 7
Joined: Mon Dec 11, 2006 1:00 am
Location: El Paso ILLINOIS

1978 340 Liquifire choke plunger

Post by liquifire340 »

Here's the story / problem..
My son is now riding my 1978 340 Liquifire. The choke lever broke on mine/his last weekend. No problem since I have another 78 440 sitting waiting for repair.
Well I pulled the choke leaver out of the 340 , and the one from the 440. They aren't the same!


:blink: The 340's is longer ( the length of the housing ) with a spring. The 440 is shorter withOUT a spring! I just took the housing for the leaver apart hoping it would be a five minute fix and ride... R-I-G-H-T..
Well.. I figure what the heck. We'd just back off the choke adjustments until it fits..right?
Well somehow the plunger from the carb dropped into the engine compartment ( we can't find it !! don't ask .. my thirteen year old son was helping on this part.) So I figure ( again ) use one from the 440's carb.
Aren't the carbs on the 340 and the 440 different ?? So would just the choke plunger AND spring ( he lost that too :


:blink: ) interchange?
It starts ok but just sounds wrong! Like it's not hitting on one cylinder or something. I just sounds and feels wrong.
I have yet to try and adjust the choke cables back since I've been so P.O.ed over the whole thing! In ten years of riding it I NEVER had a engine/ carb problem!!
Now we have snow and he can't ride until it's fixed. ANY help would be great!!!
Thanks guys! Seems like I only stop in when I have a problem, now that I have 3 Doo's to ride..
Pat ( and Matt ) Hasty
liquifire340
Posts: 7
Joined: Mon Dec 11, 2006 1:00 am
Location: El Paso ILLINOIS

1978 340 Liquifire choke plunger

Post by liquifire340 »

Cool!!! Then it must just be that I need to adjust the choke cables. Of course I didn't do that first. Too P.O'ed at my son. I know we are all young and we learn from our mistakes ( hopefully ).
Hopefully adjusting the cables will take care of it


:D
Thanks for the speedy reply!
Pat ( and Matt )


;)

I just saw I'm a listed as a new guy!! I guess that will teach a old fella to stop in every once in a while.
harleysportster
Posts: 2965
Joined: Thu Jul 14, 2005 12:00 am
Real Name: Pat Scott
Location: Southeast Pa.

1978 340 Liquifire choke plunger

Post by harleysportster »

I hope the springs are installed.
'76 440 cyclone
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
liquifire340
Posts: 7
Joined: Mon Dec 11, 2006 1:00 am
Location: El Paso ILLINOIS

1978 340 Liquifire choke plunger

Post by liquifire340 »

I'm almost 100% positive that he/we did...
But I'll double check the one he lost it from.
I'll let you guys know what I find.
Pat
liquifire340
Posts: 7
Joined: Mon Dec 11, 2006 1:00 am
Location: El Paso ILLINOIS

1978 340 Liquifire choke plunger

Post by liquifire340 »

Ok ,another question.
I'm sitting here reading my factory service manual about the choke adjustment.
Since I don't have a JDM-75 Carburetor Choke Gauge laying aroung here.. what do I use ??
Thanks for all your help!
Pat
User avatar
Danzig
Posts: 4431
Joined: Wed Aug 17, 2005 12:00 am
Real Name: Paul File
Location: Van Orin, Illinois

1978 340 Liquifire choke plunger

Post by Danzig »

Read choke lever setup posted by me in the Kawasaki Talk
1973 JDX8
1978 Liquifire 340
1980 Liquifire 440 CC Racer
1980 Liquifire 440
1982 Liquifire 440


"Gotta Lick It Before You Stick It"
harleysportster
Posts: 2965
Joined: Thu Jul 14, 2005 12:00 am
Real Name: Pat Scott
Location: Southeast Pa.

1978 340 Liquifire choke plunger

Post by harleysportster »

Danzig wrote: Read choke lever setup posted by me in the Kawasaki Talk
Paul's choke cable istructions do not apply to the 76-78 cyclone / liquifire. The early cyclone/liquifire do not have a 2 position choke.

The JD choke adjusting tool was a means to set the choke plunger in the 1/2 way position, in the choke plunger bore.
-Start by setting choke level in the OFF (down position)
-Loosen both cables at the carb, then tighten them one at a time to achive about 1/8 slack measured at the carb between the adjuster and cable housing by pushing/pulling on the cable .
-once the slack is achived, lock down the cable adjuster.
To visually see the choke plunger is working, remove the airbox, flip the choke on and shine a bright light in the hole in the end of the carb throat which leads to the choke bore. Look in the hole at the end of the carb throat, you should see the choke plunger in the 1/2 open position. Release the choke and the plunger should cover the hole completely.
Adjust the cable accordingly if the choke plunger is not in the 1/2 open position.
'76 440 cyclone
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
Post Reply