baffling issue By mrbitz (Read 650 times)

[mrbitz]

So...I've got an 85 or 86 (I don't remember and I can't find the title) Honda Aero 50. I've had it for several years and never had any serious issues. Now I pulled it out after the winter and it is acting up. So, here is what happens. It fires up and idles just fine. When I jump on the throttle it accelerates with out any hesitation for about 2-3 seconds. Then it suddenly sputters and tries to die. If I leave the throttle open it will die. However if I let of the throttle it will catch it self and general sputter back to an idle. If I let it idle for 5-10 seances I can jump on it again and get the same reaction. It does it when it is cold and when it is warmed up. Any ideas? I cleaned the carburetor, there is no restriction in the air inlet, there is clean gas, and gas in the bowl.

[cyborg]

Could be a fuel tank venting issue,,, get it up and running till it starts to sputter then crack open the fuel tank cap,,, if you hear air rush in that's the problem

[rapidrob]

It sat all winter.
As stated, take the tank cap off and run the bike
Fuel filter/tank strainer clogged?
How old is the gas?

[rks]

I think a venting issue would take more than 2 or 3 seconds to cause a problem. You say the carburetor has been cleaned, but it sure sounds like you have, at least a partially plugged jet. If you haven't made some big changes to your air intake recently, and you have fuel flowing to your carb, I'd be taking a close look at those jets.

Have you tried taking off more conservatively, like half throttle or less? The main jet comes into play at half throttle and above. Before that, the pilot jet is doing it all. Easy to determine the culprit, but I'd inspect and clean both.

[mrbitz]

yeah. I've removed and cleaned the carb three times now. It's fresh and clean gas. I tried pressurizing the tank with no success. It does also die at half throttle, it just takes longer to die. I'll try and take the carb off again. Any theories that don't include the carb.

[elcamino121]

Can you bypass the vacuum valve in the fuel line and try it, they are suspect.

[darrell]

it could be that the seat was damaged by the carb cleaner. I've come across to where the seat swells up with carb cleaner to where very little gas gets in the bowl with a swelled up seat throwing off the needle and float adjustment.