Flat spot when accelerating -

[handysteve36]

I am running a MAXX series 208cc 3600 RPM 6HP engine. It is mounted in my Bonanza BC100. It starts right up easily. When I take off it runs smooth up to about 15MPH then I get a flat spot in the acceleration. I get past the flat spot and she really gets to its higher speed nicely.
I am looking for any help in understanding what I should do to eliminate the flat spot during acceleration. The engine is near new due to it being originally on a water pressure unit that had a bad water pump early in its life.
I am hoping it is something simple like a carb adjustment or maybe a carb jet replacement.
Thanks, Steve.:thumbsup:

 

[Newoldstock]

I am running a MAXX series 208cc 3600 RPM 6HP engine. It is mounted in my Bonanza BC100. It starts right up easily. When I take off it runs smooth up to about 15MPH then I get a flat spot in the acceleration. I get past the flat spot and she really gets to its higher speed nicely.
I am looking for any help in understanding what I should do to eliminate the flat spot during acceleration. The engine is near new due to it being originally on a water pressure unit that had a bad water pump early in its life.
I am hoping it is something simple like a carb adjustment or maybe a carb jet replacement.
Thanks, Steve.:thumbsup:

I'm feeling an 140 etube might help this some.
What does your plug look like?

 

[handysteve36]

The plug is good. I will be doing the ETUBE 140 upgrade if my latest effort fails. Here is what I did. I had run my throttle cable directly off the governor arm. I was told by a friend that the governor arm may be affecting the acceleration giving me a minor flat spot affect during acceleration. This is my first throttle linkage hook up and I may have made a mistake having the governor arm as a hook up point for my throttle cable. So I have rebuilt the throttle linkage completely avoiding any contact with the governor. I now have a nice custom made linkage that directly goes to the carb. It came out very nice and I am looking forward to a road test in the morning.
Thanks for the info.