400 Indy wont stay running!

[MNSledShed]

I bought a 1990 400 Indy that has not ran for three years. Buddy just stopped riding it but ran when he stopped. I drained gas tank. Replaced gas lines. Cleaned bowls and main jets on carbs. Will start fine and idle fine. it will run up and down the driveway 2 or 3 times then will start bogging out. If i start messing with the choke you can keep it going and it will come out of it for a little bit then start all over. I also sprayed carb cleaner around the motor where all the seals are and there doesnt seem to be any gaskets or seals leaking. Im stumped on this thing! PLEASE HELP!!!!

 

[retiredpop]

Check the fuel pump impulse line to make sure it is connected securely and has no cracks or splits in it.

 

[treemagnet03]

To see if you have a fuel pump issue, take the fuel lines off the carbs, put a bucket underneath them, and pull it over 15-20 times. Fuel should come pouring out if you have a functioning pump. If not, the issue may be there. This is what happened with a sled I let sit for 3 years. Otherwise, check the fuel filter (hopefully not in the fuel tank--I hate to replace those). The other thing to do is make sure the pilot jets get blasted out with compressed air. I have had similar "symptoms" from plugged pilot jets. Just remember, gas these days is awful. Shelf life guaranteed at something like 27 days. So if you plan to let a sled sit that long again, head to the airport, get some of the partially leaded 100 (or whatever they have along that line) octane, and dump it in. 5 years from now that stuff will fire right up!

Best of luck!

-T

 

[XCRacer440]

Make sure if you dont have a vented gas cap, that your vent line is not kinked. I had a friend whos sled would run for a while then die, then after you let it sit it would run. Turned out after I looked at it for hours I figured that was the problem.