Spitfire 340

[Seth4020]

Members I have a spitfire 340 that I just replaced both the spark plugs emptied all the gas out and put fresh gas into the unit and also replaced the fuel filter on the machine. The sled will run just fine for 10-15 minutes and then after that its like it is starving for fuel and will die. I have tried cleaning the jet in the bottom of the carb again and a new fuel filter and it does the same thing after about 10-15 minutes of riding. Could is be a electrical issue or a issue with not getting fuel? When I go to restart it is will pop right back off on choke and then turn the choke off and it will run fine for about 30-45 seconds and then do the same thing. I have had the unit for 5-6 years but my father has given me the unit and I want to keep it running so that my wife and 3 kids can enjoy it just as much as I do.

[AirborneX4Special]

Start with the fuel tank pickup hose and screen. If that sled has been sitting idle for several years it will need new crank seals and a fuel tank flush. What year Spitfire?

[Seth4020]

The spitfire is a 78 I believe. Built 10/77. I have never replaced the fuel tank screen. I am assuming it is inside the tank? The unit has not been ran for 2 years I would say. Are the crankshaft seals a hard repair?

[AirborneX4Special]

That'd be a 1978. Kohler powered.
The fuel pickup is in the tank; there's a rubber seal holding the line with a metal angle fitting inside. The rubber piece can be removed which makes cleaning and flushing easier, and it along with the fuel pickup can be located through Deere parts or New Breed.
If that sled has been sitting unused for more than two years I wouldn't trust those crank seals. I've never done a Spitfire but it can't be a lot different than other engines. Typically you can split the case halves without removing the cylinders.

[75522]

I had the same issue on my Spitfire. Replaced the crank seals and it runs like a champ. Those Kohlers are damn near indestructible. To get the crank seals in, you have to remove the engine, flywheel/stator, and pulley. You can replace without taking the case apart, but it takes some effort. Best to split the case if you know what you're doing. The service manual is available somewhere on this website.

Replace the gas pickup as well. Don Amber can get one for you. fair pricing..