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Surging is often a fuel issue.----Water in the fuel ?----Agreed revving in neutral is BAD !---Revving in neutral is a meaningless test.

Need to lap flywheel / crank tapers.-----Need to use a factory key.----Crank and nut threads must be in good condition.----Torque nut to 45 FT LBS

???----Not sure how you determined that a 9.9 HP will fit on the 7.5 HP midsection ----Because it will not fit !!-----And the " super 10 " was not a 9.9 on a 7.5 midsection.-----Sorry --you are sadly mistaken on these 2 topics.

This process starts with a compression test.----Post your actual values.----There have been issues with # 2 cylinder.-----And does the telltale hose come off the exhaust manifold ( side off the block ) , or moved to the top of the block?

0B2187 ---would put it as an 87 model.

Mice will chew it up , they all need a home.

The wee bits of foam must be cleaned up.----If they get into / stick in the reed valves there may be issues.

Feeds 12 volts to electric primer valve.----Operates when you push the key in while cranking for cold starting.

I can not see or touch your motor.-----I believe the clutch dog is rubbing on either reverse or forward gear.-----Easy to adjust.----If that is not the issue then you need to investigate.

Sounds like shift rod needs to be adjusted.------What dimension did you use to set shift rod height??

Perhaps the 6 he read is really a ---G----Ask seller to re-read it perhaps.

That is a newer 3 cylinder looper.-----Why / how did you come up with the 6218 serial ??

Many factory gaskets ( and some aftermarket ) have a coating on them.----Experienced mechanics know not to use sealer on these.----Saw a U-tube presenter put a VERY liberal coating of gasket sealer on carburetor gaskets.----Did not realize that he was plugging up the oil recirculation channel on...

An 87 model would carry a serial # starting with --B110054--- I think.----Internal reed valves direct air and fuel to the 3 crankcases.----Did that beginning in 1972.

I doubt that your 6218795 model is the same engine group as the later 3 cylinder loopers.----Does your motor have 2 carburetors ?

A 3 cylinder ?

Brother in law----Has lived in a remote town all his life.----Every time I went up there, he had a radio on day and night in his workshop.----Protecting the biplane he was working on I think.

Unlikely , but is it a 4 cylinder?-----Or the newest 3 cylinder looper 75.

The 9.8 would be crank rated power.----The 8 HP 2 stroke is prop rated ??

Play a radio in there ??