Honda Spree and Elite 50 Forums

I have a 1986 Honda NQ50 Spree that I have had yes, since about 1986. Anyhow, it has sat over the years and I am desparately trying to resurrect it this summer. It starts and runs great even at full throttle it is very smooth. I had that carb off and disassembled and cleaned, I also cleaned the gas tank, put new lines and filters, spark plug, etc. I am pretty sure it is not a fuel delivery problem, but after riding wide open just fine for 5 miles or so, when I come to a stop and then accelerate, the engine just cuts out and dies. Perhaps coincidently, the battery will also not hold a charge (it is only 3 years old). From reading multiple tech documents I am wondering if a failing Auto By-starter would exhibit this type of symptom? Will the dissassembly and reassembly cleaning procedure help heal my sweet ride or do you think it is probably something else? Thanks for all the help, you guys seem really educated on this stuff.

Try de-carbonizing the cylender, and/or testingn the compression.

plugged gas cap vent?
does it only happen when it's hot or anytime after 5 min's?
what about riding NOT WFO

The 5 minutes was only an example. I can ride in circles in the driveway for a while then it will happen. I think it is safe to way that the problem ocurrs when the engine warms up regardless of how I warm it up (at 5 MPH or at 30 MPH). It could be the gas vent although I did just replace the gas cap with a new used one from ebay. The old one rusted on me.
I will have to try the de-carbonizing process as well, keep coming with the ideas they are appreciated very much.

Could it be a problem with the fuel petcock? Perhaps a plugged vacuum line or sticky valve? Would that cause this type of behavior?
Thanks again!

you could also try checking your carb screws. on mine it doesnt have a idle screw and it starts fine and goes but if i stop it will die if i dont give it gas.