Posts: 3508
Location: Elk River, Minnesota | Still sounds like it could be a fuel issue.
Couple of things that come to mind...for a quick check... a possible pinched or kinked hose somewhere along the line, a possible dirty fuel pump screen...
Another area to check could be the end of the fuel pick-up in the tank you are using. Sometimes those have a screen and/or a sponge in there to help filter the fuel which just needs to be removed, cleaned, and replaced. I know chain saws use them due to the environment they are in and I have had tanks with them as well. If that sponge/screen is restricting fuel flow, the surging you mention would be the result.
Heck...might even try changing out the spark plugs if you have not done so already...cheap and preventative maintenance as well.
A major suggestion to do would be a deep cleaning of the combustion chamber with a pressurized can of decarbonizer (like sea foam in a can). As long as you are putting some time and effort into getting the motor running well, might as well take care of this one as well.
Get the motor warm. Set it to high idle. With the cover and air silencing box off, spray the decarbonizer directly into the carb throat with little bursts...the motor will bog down and white smoke will start to come out from burning the cleaner. keep doing so for a short while, then start a continuous spray until the motor dies. Continue spraying into the carb throat for a few more seconds (like 10), then let the motor sit for about 30 minutes. Take it out and run it clean....then replace the spark plugs. This will get your entire combustion chamber clean and free of carbon build up, which robs the motor of power overall. motor will hopefully run smoother throughout the rpm range, but especially on acceleration.
Good luck.. hate to say it, but it sounds like you unfortunately inherited some issues with this motor when you purchased it...
Steve
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