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GP150 22 Carb.

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GP150 22 Carb.

Postby St George » Thu Oct 24, 2019 5:51 pm

New GP 150 rebuild. Crank, barrels, piston Head etc. Starts first time on choke with a standard 22 Delly, does not like the choke off until really warm otherwise it dies. Shall I up the pilot size until it's run in to be on the safe side. Standard jetting at the moment.
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Re: GP150 22 Carb.

Postby Toddy » Thu Dec 12, 2019 7:04 am

Thats an idea but have you cleaned the carb out internally maybe something blocking it or may have an air leak was the rebuild pressure tested ?
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Re: GP150 22 Carb.

Postby hullygully » Thu Dec 12, 2019 7:37 pm

have you tried your tickover screw?????? :o
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Re: GP150 22 Carb.

Postby St George » Fri Dec 13, 2019 6:00 pm

It is starting well and when warm it revs well with the choke off. When I ride it the fuel seems to be starved every few yards then it picks up for a few yards. The carb is spotless and the flow from the fast flow tap is not too bad. I have changed to an atomiser with bigger holes, still the same. The vent hole in the tank cap is fine. Just feels like it wants to run out of petrol ?
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Re: GP150 22 Carb.

Postby missing lynx » Fri Dec 13, 2019 6:08 pm

Is your fuel pipe too short or long?
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Re: GP150 22 Carb.

Postby St George » Fri Dec 13, 2019 6:15 pm

Very short.
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Re: GP150 22 Carb.

Postby missing lynx » Fri Dec 13, 2019 7:47 pm

That could be your problem it should be a gentle curve to allow for engine movement
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