gv250 running issue

[evlweevil]

hello everyone and thank you for any info in advance. a couple of days ago i started my GV up in the morning to go to work ,walked inside to get phone came out and scoot stalled. Started back up but would not run when throttling. Found water in the fuel. removed gas tank, drained and cleaned out. replaced fuel filter cleaned out lines. replaced spark plug also. The scooter starts up and revs up at first and you can throttle it up but as it gets warm the idle stays at "1000" and if you try to throttle it bogs down and even "backfires/pop". Pulled out spark plug and looked at piston and can see alot of carbon. now the spark plug i changed the gap was at .024 not .036". Am I looking at possible damaged to engine when it tried to compress the water in the fuel or possibly the carb is the issue? I understand that am asking alot without seeing but just looking for a direction to go before trip to mechanic.  Again thanks for any input.

[Hoolander2]

You didn't mention cleaning the carburator so I might guess it still has water in it.  Look for a drain screw on the carb and drain it -- replace drain screw and try starting.   The motor may still not want to start till the carb refills with new fuel so don't crank on the starter more than 5 seconds at a time with 30 second breaks in between so as not to overheat the starter.

[MaryK]

I agree that there is water in the carb's float bowl.
If you can't get to the drain screw, then try adding some water removal agent to the fresh gas.

I would use SeaFoam, which is also a fuel system cleaner and gasoline stablerizer. 
Get SeaFoam at WalMart and most Auto Supply stores. 
Remember that you will have to run the engine (at idle, I guess) to use fuel and get room for the
new fuel mixture to get into the float bowl.

Best if you can add the Seafoam and drain the float bowl.

Be sure to use the labeled amount of SeaFoam/gal of gas.  More is not better. 

Scoot Safely

[evlweevil]

well i have an update. The scoot when cold now will run up to 3000rpm's, rear tire spins and then the idle will come down to base idle 2000rpm's. The issues that it will idle on its own and after it's at running temp it will stall and won't restart untill it cools down. Also while idling it will not throttle up it just bogs and stalls. performed compression test and its about 135 to 140 psi after five tests, compression for this engine is 15kg/cm +/- 2 (about 213 to 215 psi). Going to call my friend who works on motorcycles to confirm my results, but it looks like I'll be replacing the head and piston. For the price I'll probably upgrade to 300cc. Again thanks for all the input.