I recently finished my first build. Due to weather and lack of time I really havent ridden it except a few short jaunts, but there seems to be a problem after it warms up. It's a Grubee GT-5 Skyhawk angle head.
It starts and seems to run fine (given the oil-rich break in mix and brand new engine). After a minute or so I can shut off the choke and it still runs great. After about another minute or two it starts to hesitate and not want to maintain power, then power quickly falls off. As speed drops you are forced to pull the clutch lever and feather the throttle to get it going again which it usually does, then try again. As soon as you start running up the RPMs again, it will happen again. The only way to get it back to normal performance is to shut it down and let it cool.
I am not a two stroke guy so I am not sure where to start looking. Based on searching this site my guess is maybe gas tank not venting which restricts gas availability, or possibly an air leak but I would think that would cuase problems right away, not only after the engine warms up. Not really sure what else to look for.
When I get home this afternoon I am going to try to figure it out. Any tips from the guru's here would be greatly appreciated!!
Thanks.
It starts and seems to run fine (given the oil-rich break in mix and brand new engine). After a minute or so I can shut off the choke and it still runs great. After about another minute or two it starts to hesitate and not want to maintain power, then power quickly falls off. As speed drops you are forced to pull the clutch lever and feather the throttle to get it going again which it usually does, then try again. As soon as you start running up the RPMs again, it will happen again. The only way to get it back to normal performance is to shut it down and let it cool.
I am not a two stroke guy so I am not sure where to start looking. Based on searching this site my guess is maybe gas tank not venting which restricts gas availability, or possibly an air leak but I would think that would cuase problems right away, not only after the engine warms up. Not really sure what else to look for.
When I get home this afternoon I am going to try to figure it out. Any tips from the guru's here would be greatly appreciated!!
Thanks.
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