Old gas and power loss?

[EcEvan03]

So i just bought an 03 ec300 that was bought new in 05. Very low miles, still has original tires on it. When i got it home i took it for a test ride and raced my friend with a 04 ktm 200exc and i expected to beat him pretty bad but we were neck and neck the whole way the guy i bought the bike from said the gas was old. Im thinking from last summer, could this cause a ~10 hp loss? And account for the lack of power? I drained the gas and put fresh gas in and it starts easier and sounds better but havent gotten to ride it due to rain.

It also still has stock jetting, i know these bikes are jetted poorly from the factory. Could this be the problem? Runs rich.

Should i clean the carb or powervalve? Any insight would be appreciated!

[desertgasser300]

I would pull the carb off and give it a really good cleaning. Old gas will turn into a shiny stinky varnish that will coat and plug small orifices in the carb. Put a new plug in and check your jetting.

[EcEvan03]

Ok will do. Also what should the float be set at i read they are too high from the factory?

Anything else i should keep an eye out for or do with this model and year to ensure its longevity and proper functioning? Thanks again.

[EcEvan03]

Also anyone have any jetting advice? I read 178 main 42 pilot. Im at about 500ft elevation.

[stainlesscycle]

jetting will be dependent on needle more than anything else. what needle is in there?

float height should be 16mm.

you'll know it's jetted correct if when you wack the throttle the bars hit your face

on a straightaway the ktm200 should run with it for about 150 ft, then the 300 should just destroy it.

[EcEvan03]

Its the stock needle. Would i be better off with an aftermarket one and jetting accordingly?

It pulls wheelies everytime i shift pretty easily but semms not to have the top end. But maybe it should wheelie even easier.

I ride year round would a new needle allow me to adjust for wide temp range?

[Rick]

Could be a power valve sticking as well. Do a search on power valve cleaning....plentyof info on that subject.

[stainlesscycle]

what is the stock needle in there? and what is your jetting now?

[EcEvan03]

Stock need n1eg 38 pilot not sure about the main yet. Im going to get a 42 pilot and 178 main put stock needle 2 clips down from the top and see how that goes. If it doesnt work ill try a n3eg needle or cek. From what ive read that should clear up my issues and give me the power im missing.

Any thoughts?

[Clay]

Originally Posted by EcEvan03

Its the stock needle. Would i be better off with an aftermarket one and jetting accordingly?

It pulls wheelies everytime i shift pretty easily but semms not to have the top end. But maybe it should wheelie even easier.

I ride year round would a new needle allow me to adjust for wide temp range?

What gearing is on the bike?