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Have you checked the Crankcase seals? I have 2 Big Bosses with 250's. 1989 + 1992
Both were terrible at starting and idling....after much troubleshooting I finally changed the crankshaft seals. (Which btw looked fine from the outside!) machines can be Cold now and will start 2 or 3rd pull with the cord now. Idle perfectly.
Also the oil injection system stopped working intermittently. Machine would just quit.....crank and crank it forever. So I just started using 32/1 mix and unhooked the Oil Injection cable from the Throttle.
Try this. When you get to work leave the bike running and turn the fuel selector knob to off and let it run til it cuts off. It will drain the fuel from the carbs and trap the rest in the tank. It removes the air bubble in the lines problem so when you get ready to leave, switch the fuel on and wait a few minutes then crank her up and ride.
Try slackening the fuel filer cap, if the breather is blocked in the cap it will vacume and stop the fuel from flowing, if it runs ok with the cap loose replace the cap.
Check the fuel cap, Loosen the cap off and try it, the fuel cap may be plugged or missing pieces. If no air is getting into the tank it will eventually stop the fuel flow to the carburetor and if it sits for awhile you may be able to start it again for another 15 - 20 minutes. It will be worse with a full tank of fuel.
fix the leaky injector its loosing fukle into the pots locking the engine up when you try to crank it over,,,
be warned,,,,it will bend your con rods or smash the pistons,,,
I would start with the fuel filter, then the fuel pressure regulator. If those two are not the source of the problem you may also find the issue in the idle air speed solenoid. A couple of other places you can look is the air filter, the mass air flow sensor, or actually just cleaning the throttle bore. Hope this helps, good luck!
if it's trying to start, but taking ages, could be two things really, one it's a fuel problem, check out all your fuel pipes and breather pipes and clean your carb, of the other is the compression is ****, may need new rings, but i would go down the route of fuel first, sounds like it's the fuel
I don't think this is a float issue. One way to check is to turn the gas off, take the bowl off the carb, hold the float up, and turn the gas back in. If fuel flows, the float needle is toast.
It sounds suspiciosly like a worn topend, but it could also be a clogged jet ot fuel filter, or a faulty CDI.
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