Last season

[slayerman5]

Ok guys last season the bike runs well ,now when i open the throttle he lose power and than increase it when is hot seems better some reason carb cleaning or smthn with the petcock?

[Vegas Street Rider]

How long did your bike sit idle? Did you treat the fuel in your tank with Stabil or another gas treatment product? It could be shellac build-up in your fuel system.

I like to run Seafoam in my fuel about every 6 months or so now that my GZ is no longer my daily rider. 1 oz. per gallon capacity. It keeps everything squeaky clean.

You might have sediment on the inlet screen of your petcock or build-up behind the diaphragm. Options : drain tank, check petcock inlet, take petcock apart and clean, and if all else fails, clean carburetor.

[slayerman5]

Hi again , yea i use stabilizators also a high octane fuel, i will check again because a snow fell here again, but i think the air fuel mixture is too lean , because when i open throtle , it seems bad acceleration ! Could it be a reason? On idle and on low rps with smooth throttle open is ok than max throttle and goes bad?

[Vegas Street Rider]

It could be a stuck float. Also, you might want to start it up and run it with the petcock set on prime to see if that makes a difference. I would think that would determine if the diaphragm in the petcock is bad. Worth a try.

[GZ300]

Clean the carb it takes 30 minutes. Sheesh.