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When no load is on the motor it will rev up but as soon as you put it into gear it stutters and only hits a speed of about 5 mph compared to a top speed of 25, 2 days ago. What suggestions do y'all have to check.

Thanks,

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use a Harbor Freight Spark plug tester ~ $5.00 make sure you have spark on both cylinders,

Inspect the grounds on the coils, possibly OHM test the coil for Hi/Low pole impedence.

Visually inspect the spark plugs,

Do a compression test,

Trouble shoot the power pack, check for corrosion on PP wires.
 

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Check compression, check to see if you have spark on both cylinders as Bigrigz said. If that is good, I would say it is fuel related. Check for water and debris in the filter. Squeeze the primer buld and see if it holds pressure. If not, could have a leaking fuel pump diaphram.
 

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DOUBLE "D" & LV (1/25/2010)Check compression, check to see if you have spark on both cylinders as Bigrigz said. If that is good, I would say it is fuel related. Check for water and debris in the filter. Squeeze the primer buld and see if it holds pressure. If not, could have a leaking fuel pump diaphram.
Compression is 103 and 92 (new is 110).Both cylinders have great spark. I checked for water and debris and non were found. Primer bulb stays primed and does not lose pressure. There is unburnt oil coming out of the exhaust and I dont know what to check next.

Thanks for any help,

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Not liking the comp readings. You may have a stuck ring from carbon. I would be curious to how each cylinder wall looked. May have scoring, then there's not much to do but rebuild or replace. You can use a wand light and try to see into the cylinders. I use awand camera to look inside the engine. If you want to start on your own and try a few things, replace the spark plugs, clean the carb, fresh fuel. If it runs good, then do a comp check after to see if it is any closer to even on the cylinders. One other thing to check... not sure if it has one or two carbs.... if two, check to make sure both are opening the same and all the way when the throttle is openned to wide open (do this with the engine not running). If one, make sure it is openning all the way.
 
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