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Might well be time to clean the carb. Properly.

OK, always a good idea to mention actual model. MFS9.8B? Always prudent to run the carb dry at the end of the day. Grab a cheap IR thermometer to see if you are overheating. Is it peeing well, and is the stream either cool or slightly warm?

Unfortunately, the original MD90B manual is out of print. But the MD90C,( which is available from any dealer), manual has the same codes. The schaeder valves are metric; you can get an expensive gauge set from Tohatsu, or use a tire gauge.

I would ask the aftermarket dealer about compatibility. You can use a timing light to verify timing.

I assume your model is MD90B. What in the heck is a fuel vacuum regulator? What manual are you using? 7000 and battery is a FFP issue. Could be a severed line or a pump problem. That info is right in the Factory service manual. What are your air and fuel rail pressures?

the -1 is just a newer revision. That motor is so old, it's amazing you can get _any_ parts for it.

Sounds like you also have a fuel issue. I would clean the carb. Properly.

Definitely need a compressor cylinder. If oil pump is leaking, need that too. Then see whether pressures are OK.

I suppose, but I would ask CDI electronics their opinion.

That cylinder looks pretty bad.

Pressures sound s bit low.

The electric pumps are pretty reliable. MSRP around $400. I changed one in all my years working on these. There are fewer than 10 units in stock at Tohatsu America.

No put downs here; just helping you in the right direction. If you are flooding, the float valve is not seating. Period.

Flooding has nothing to do with no spark. The check valve is to keep the accelerator pump full, so if it leaked, the worst would be no fuel from the accelerator pump. Re check your needle valve and float.

What model motor? Brand?

Can't use muffs as the intake is under the antiventilation plate. Yes, flushing is always good, and you can idle until the stat opens.

Dx the high pressure pump and check the float in the separator.

Sounds like you diagnosed it. BTW, best to use DVA to measure voltages, because the pulse is so quick.

Of course everything is in the Factory service manual, available from any dealer. An analog ohm meter will be your friend. How do you know it does not have spark?

Timing?