FNG with a Massive Air Leak???

hooligan2stroke · Post by **hooligan2stroke** » Mon Jul 09, 2012 1:27 pm

Just when I thought I was all alone with my little GT250, I find this message board (and breath a sigh of relief)!!

I have a 1976 GT250 that hasn't run in at least 8 years. After cleaning and rebuilding the carbs, new petcock gaskets and seals, new battery, and a Fuel Tank clean out..... She started on the second kick; but...

...She immediately revs up to 10 grand, then dies out. I screwed around with the air mixture and it seemed to help the tiniest bit. turning the choke on will keep it running a few seconds longer. The air cleaner boot is sealed tightly on the carbs and the air cleaner box, carbs are tight into the intake ports; but, the way it acts keeps making me think Air Leak.

Any thoughts??

Coyote · Post by **Coyote** » Mon Jul 09, 2012 2:13 pm

I've never owned a GT250. I looked at an online fiche and I see it has a vacuum operated petcock. Check the hose from carb to petcock for cracks or splits. Replace any that look suspect. If the petcock has been changed to a manual one, make CERTAIN the vacuum fitting on the carb is capped (blocked off). If left open, that's your massive air leak.

Barry S. · Post by **Barry S.** » Tue Jul 10, 2012 10:12 am

See if you have the carb slides in backwards, right one in the left carb.

hooligan2stroke · Post by **hooligan2stroke** » Wed Jul 18, 2012 3:37 pm

Thanks Fellas... The slides were in backwards; and, the exhaust baffles were lightly packed with steel wool. (?????)

Moving forward now. More Q's to come.....

FNG with a Massive Air Leak???

FNG with a Massive Air Leak???

Re: FNG with a Massive Air Leak???

Re: FNG with a Massive Air Leak???

Re: FNG with a Massive Air Leak???