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I wrote all of this below and figured I'd come back up here and clearify...I think it sounds most like a carb issue...but I'm leaving everything else just so you have other things to check.
Sounds like it might be running over rich. Check your plugs to make sure one isn't fouled completely out. If they look good, check and make sure they are firing (you can pull one at a time and touch the threads to the outside of the engine block to ground it and crank it over...you should see it spark. If they are firing, check your filters (a blocked air filter can cause insufficient air flow and it would toss out until it could pull enough air in). Has the bike been sitting for a season or two with the same gas? If so, get rid of the gas in the tank...it's most likely turpentine now and would be better as a paint stripper then a combustion agent (yes...gas does spoil and depending on how well your tank is sealed...it can happen faster than that). Could also have some water in your tank. So if its been sitting, honestly longer than a month, I'd get rid of that the gas in the tank. From there check the carbs. You could have a float valve sticking or a bent needle. Last but not least...if you've done any major work to the engine...check your points or have someone check them for you. You could be off by just a degree or two and it will muck up everything. Hope this helps in some way and best of luck!
Okay, you need to make sure the fuel pump is getting power and that you have the lines hooked up correctly. Also, when you replace fuel pumps you need to remove the air cleaner and use starter fluid to get the engine started.
The thing runs then dies, left set it will run again and then die. Sounds like fuel starvation some gas slowly seeps through, enough to refill the float bowl and start it.
I had similar problem on an old Sunbeam. After doing everything else, turned out to be paint inside gas tank was flaking off and plugging up the hole at the tank bottom where the gas line attached.
Had a similar problem on a Datsun. Turned out a small piece of chewing gum wrapper foil got inside the gas tank and formed itself into a perfect fitting cover for the fuel pump impeller intake. This was so long ago it was the first in-tank fuel pump I had seen.
Note neither of these situations would have been fixed by replacing the in line fuel filter. I have run into old moldy gas line deterioration on mowers. Builds up **** at inlet to carb.
Hi, i would start by making sure the fuel is on if that is an option on your saw. Then makes sure there is nothing obstructing the flow of fuel from the tank to the carb. You can check the lines by draining the tank the blow thru the tank with an airhose and make sure air is coming from the delivery line that hooks to the carb. if all checks out there, then you my hve a gasket on backwards inside the crb or your fuel flow screw needs adjusted. You can check to see if the carb has gas by gently loosining the drain bolt on the bottom. Another option is removeing the air filter and dumping a small amount of gas directly into the carb and see if it starts then. If it does then yo have a problem with fuel delivery from the tank to the carb into the cylinder head. Hope this helps.
There are two lines from the tank to the carburator. One picks up gas and fills the prime bulb, the other is a return line. The pickup line should have a filter on the end of it that is in the tank. The other line just dumps back in the tank. Usually the reason these lines deteriorate is because of ethanol in the gas. Make sure you're using ethanol free gas.
It sounds like the carburetor is running out of gas. If you have the original petcock on the tank, you MUST have the vacuum line connected. When the engine starts up, vacuum from the carburetor is applied to the vacuum diaphragm in the petcock and opens the petcock. Without vacuum on the petcock, the only fuel you will get to the carb is if the needle valve in the petcock leaks.
Now, you said you had the tank painted. This is the clue. Painters pay a lot of attention to the outside of the tank but NONE to the inside. I would guess that the screen on the inside of your tank is completely blocked with small chips of paint or sanding material.
Replace the vacuum operated petcock. It's a "Motorhike" waiting to happen. A "motorhike" what you do when your bike quits and you wind up pushing it. I've seen too many of these things leave people stranded with a full tank of fuel but not a drop in the carb. Replace the OEM petcock with a high quality manually operated petcock like the old timers use. A Pingle is a very good choice. If you want to save a few bucks, check on the price of an OEM petcock for a 1995 or earlier model. Block the vacuum line off and I'd advise an inline fuel filter. Buy the sintered metal type filter that can be cleaned. These filters come in Chrome, and a few anodized colors as well.
You may have accidently hooked the lines to the purge button wrong. The purge button (primer button) should have a short stem and a long stem. The short stem is the suction side of the primer button and should be hooked up to the return on the carburetor. You actually s*uck gas through the carb and not from the tank. The carb should have two hook ups. If you hook the fuel line up to one of the lines on the carb and the button is hard to push and doesn't return to normal, hook the line up to the other one. When you push the primer button gas should be pulled through the carb. The other line on the carb goes back to the fuel tank.
Forget the wiring. The key thing here is probably the painted gas tank. In all likelihood there was some trash that got into the tank related to the paint job. Do this > Carefully remove the water trap bowl from the petcock, (gas valve), and look inside the bowl. It may have some water in the bottom and some trash on top. Clean the bowl. Next, remove the petcock and clean it as well. Drain the carbs. Turn the gas on and wait a minute for the float bowls to fill.
Give it a try. It may be that the gas from the tank is restricted and can't refill the floats as fast as the engine needs. A second thought is the exhaust pipe. The bike will not run well if the exhaust is partly plugged up. Disconnect the exhaust and tick off the neighbors by going around the block without a muffler. The inside of the muffler may have collapsed when the welding was done.
Between the two solutions I think the exhaust is the more likely.
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