90HP Force engine..... help identifying year?

[Racer67]

What I know:

It's a 90HP Force Engine (or so what I was told)
3 Cylinder, each with their own carb
2 cycle

I can't find any metal plates with a serial number or any information. I'm completely lost. I need to buy some parts to give it a tuneup, but need a year. Can anyone help?
Thanks!

 

[jerryjerry05]

Under the blue packs and coils is a foundry stamp with the year in the middle of the stamp.
Sometime if the starter hasn't been changed it will have a date on the body somewhere.
As far as a tune up" the only thing to replace is the plugs.
Change the impeller and gear oil.
Maybe change/ install a filter before the carb after the pump.
I see the trigger wires are hanging out and need to be pushed back and covered or wrapped up.
They are very tiny and can pull easily and break under the shrink wrap.
It's missing the air diffuser or intake. It keeps the crud(leaves) and the foam from the cowl out of the carbs.
Then maybe the recirc system needs to be cleaned as part of the tune up??
It's a 10in dog bone looking thing on the side of the power head.
Do a compression test, just to make sure there is no future problems.

 

[pnwboat]

Looks to be about a 1990 or possibly a 1989 90HP. That's just a guess though. Looks like you have some green corrosion on one of the rectifier terminals.