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that's pretty common for the middle cylinder to be damaged on those. There was a service bulletin for the peehole to be re located to the top of the block to prevent that. Is that Done? try a different gauge, or pull the head off

anything just not a 3 cylinder.

Does that have a recoil starter on it. Those motors are pretty stout to pull. Check all your electrical connections. Make sure they are shiny clean the grounds on the block also.

buy a different motor. Converting it to a tiller is going to be expensive by itself. Then you have the lower unit problem which is a known issue on those motors.

How does it run?

Your speed is where I would expect it to be.

Have you Looked at the fuel pump diaphragm? The accelerator pumps and or primer.

With that motor use a carbon guard or Yamaha ring free.

Ken Cook publishing. Only a factory manual is worth buying. No Seloc or Clymer https://www.outboardbooks.com/

Get a manual. Have you dine a link and sync?

Your compression is horrible. Is your starter spinning fast enough? Where did you buy the CDI box from? Do you have a factory manual?

Did the shift shaft get spun out during any of these impeller changes? Brass coupler not seated correctly?

I am going to say no because I bet the gear ratio is different. Look at an SEI unit

Look up Suzuki 140 codes

Why can't you use a magnet?

The pee hole goes into the side of the exhaust manifold cover

Well the hood looks 85 or earlier.

Kind of a Frankenstein but looks like a early powerhed dropped on the 85 chassis.

Not true at all. Mercosil can be bored by a competent shop. And rebuild kits are readily available.l.

Yes it takes a special tool set the pinion height.