1978 John Deere 440
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1978 John Deere 440
I have a 1978 John Deere snowmobile and it wont start. There is gas that is coming out of the exhaust pipe and spark plugs are flooded.
What could be the problem?
Thanks Zach
What could be the problem?
Thanks Zach
- crazzygunner
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- Location: wisconsin
Re: 1978 John Deere 440
It sounds like you are geting gas so I would check spark because it sounds like the gas is not geting ignited and going through to the exaust so check for spark and if no spark make sure that the kill switch is not on or bad because I have had this happen a few times also was it running recently if it was then it could be something simple like a kill switch as long as you got gas spark and compeson it should be a go good luck.
Evan
Evan
Have1976 cyclone 440,1996 Z440 ,1988 yamaha exell 340, 2009 F5 lxr
Had 83 trail fire 440
Had 83 trail fire 440
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Re: 1978 John Deere 440
I'd check and make sure the needle in the carb is seating correctly.
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Re: 1978 John Deere 440
Here is a complete troubleshooting guide:
http://www.jdsleds.com/tech/troubleshooting.html
http://www.jdsleds.com/tech/troubleshooting.html
Matt - JDsleds.com Administrator
Re: 1978 John Deere 440
If you have gas running out the exhaust, it is flooded so bad that spark will not ignite it.
Unhook the fuel line, remove the spark plugs and pull it over until all the gas is out of the crankcase.
Then confirm spark , check carbs and recheck neddle and seat plus set floats as suggested.
Then hook up fuel again and try to start it.
An totally flooded case can have 2 or 3 cups of gas in it so be carefull.
A backfire with a bellypan full of gas can have you looking for a new garage.
Unhook the fuel line, remove the spark plugs and pull it over until all the gas is out of the crankcase.
Then confirm spark , check carbs and recheck neddle and seat plus set floats as suggested.
Then hook up fuel again and try to start it.
An totally flooded case can have 2 or 3 cups of gas in it so be carefull.
A backfire with a bellypan full of gas can have you looking for a new garage.
Todd Schrupp
Milbank SD
Milbank SD
Re: 1978 John Deere 440
Be sure you have a 6f27 jet needle in there. Too high of a fuel level in the bowl could be a factor.
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- Location: Wisconsin
Re: 1978 John Deere 440
I am getting spark and i just cleaned the carb. It first started acting up when hot and then i took of carbs and i noticed that my Idle screw was missing so i took another one out of another mikuni carb and i made sure it was the right size and all then i replaced the spark plugs and fuel filter now I am were I am at.
Is there an easier way to drain the gas out of chain case so I dont blow my sled up from a back fire.
Is there an easier way to drain the gas out of chain case so I dont blow my sled up from a back fire.
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- Location: Wisconsin
Re: 1978 John Deere 440
How many turns out does the idle screw have to be out?And also the fuel one?
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- Joined: Mon Dec 27, 2010 10:53 am
- Location: Wisconsin
Re: 1978 John Deere 440
How much is compression supossed to be in both cylinders?
Re: 1978 John Deere 440
Specs will be found in the repair manual. Another recent thread on here will refer you to a site to download the manual for free.
"Started acting up" you hadn't previously mentioned that, you only previously stated symptoms of flooding. Please specify what are all the problems.
A overfilling carb bowl is what I would guess is causing your problem. Needle & seat would be the likely cause for this.
"Started acting up" you hadn't previously mentioned that, you only previously stated symptoms of flooding. Please specify what are all the problems.
A overfilling carb bowl is what I would guess is causing your problem. Needle & seat would be the likely cause for this.