I rebuilt 2008 GTS 250ie engine over the winter. Scooter (29,000 miles) was run with no oil by the previous owner.
I bought the scooter and replaced the crankshaft, piston, rings, oil pump following a ScooterWest video. Engine runs strong, starts OK. BUT I continually have to goose the throttle when stopped to keep it from stalling. It seems to idle when I hold the throttle, but when I let go it dies. I am currently running injector cleaner with the gas and it is running better but no improvement to the idle.
Here is what I've done to date.
* Tightened all ECU hose clamps to stop air leakd
* Applied a thin layer of silicon between the intake manifold and block to stop any air leaks
* Made sure injector hose firmly attached
* Replaced battery
* Made sure spark plug wire on tight
I look forward to your ideas.