Hey Lazieboy. No air leak, no pinched line. I do have the tank setting above, but close to the carb. So perhaps there is not enough gravity involved to help keep the bowl filled. combined with the angle and the vibration I might get this figured out today.
I went to the links you included thinking it had something to do with my carb problem. Imagine my suprise when they turned out to be about getting stopped by the police, And pot. I've only been on this site a few months, but don't those belong in another forum. I have no problem with the cops and I don't smoke weed, (anymore). I think it should be legal but that is for another forum, don't ya think?
Thanks for the input anyway, ALL suggestions about how to get my engine running right are welcomed.
Big Red.
Oh yeah, I forgot to add, Brand new Muffler.
I doubt that it's a gravity feed problem. On one of my bikes, the fuel line from the tank to the carb is only 2 inches long. is your tank cap vented correctly and is the vent open and clear?
I assume that you have had the carb apart to make sure that the jet is actually screwed in and not laying in the bottom of the bowl
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It sure sounds to me like it's running out of gas in the bowl.
But, it seems that you are not willing to take my word for it....so let us know what you find out.
Think about how much fuel these engines use while riding at w.o.t..
When you are at w.o.t. there's more gas getting sucked up through the main jet than what is being returned to the bowl. The float bowl should never go empty while riding.The gravity feed is more than enough to re-fill the bowl as soon as the float drops and opens the needle. more fuel will flow out of the tank, than what will be used by the engine at w.o.t. for a long time.
If your float is at the incorrect angle, no matter how much fuel is flowing into the bowl, if the seat closes before the bowl gets filled, (float at an agle) it will run out of gas.
While you are riding, the float is constantly going up & down to keep the bowl full. If the float drops too low before the seat opens the fuel going into the engine will be more than what is going back into the carb. and it will run out of gas.
I had this same problem on my 49 c.c. because the carb was at too much of an angle (rear higher than the front). it ran perfect from idle to 3/4 throttle and then at w.o.t. it would run great until the bowl would run out of gas and then it would rev up and die. The gas flowing in could not keep up with the amount of gas getting burned and the bowl never truly filled up before the needle & seat would close (because the float was at an angle).
I lowered the rear of the engine and raised the front of the engine to make the carb sit level and i have not had a problem with it since. I can ride at w.o.t. for as long as i want and it never runs out of gas or dies.
the only thing i changed was the angle of the engine and carb and it fixed the whole problem.