250rtc engine/carb problem

**mattbujor** · 12-16-2011, 10:40 PM

just curious as to whether this happens to anyone, bike starts up good, ride around for 10 minutes then engine just starts bogging out, going full throttle has no effect/the engine just starts going lower and lower rpm while bogging( by bogging I mean chugging along) and if you let go of the throttle just a little the engine turns straight off.

**barnone** · 12-16-2011, 11:01 PM

Make sure that the choke is not on.

**mattbujor** · 12-16-2011, 11:34 PM

Originally Posted by barnone

Make sure that the choke is not on.

I did, eventually I waited a few hours and it rode perfectly again. Guess the engine was just too hot and I need to do a valve adjustment soon

**barnone** · 12-17-2011, 03:26 AM

I still think the choke was on. If your engine got that hot to make it run the way you described then you should have major damage. Why do you think the engine got too hot?

**Krasi** · 12-17-2011, 02:27 PM

Check tank venting. It's possible that not enough air gets in, and this reduces fuel flow.

**MJH** · 12-17-2011, 04:17 PM

The tank likely is vented at the top, typically they have a chamber the fuel needs to be beneath that chamber. It would have a vent line that leads into a canister filled with charcoal, it filters the fumes and prevents the tank from forming an air lock and chocking off the fuel supply. Basically you should never top the tank the fuel should be far enough from the top to ensure you do not submerge the vent.

If a bike is not running right and particularly if it is brand new you should not keep running it.

If it running fine now with less fuel in the tank then that likely was the issue, if you feel it over heated then best thing to do is change the oil. When you do that measure what you take out and do not put more in then you take out.

You could assume that the specs on the valve clearances are correct from the factory, you would hope they are! You typically check them after the engine is worn in not before.