1988 Black max 200hp overheating

[whitehead249]

I bought this engine 1 year ago. it didn’t have thermostats or a popit valve in it when I bought it so put all new back in and it throws the overheat alarm when go about a 1/4 throttle but it will idle fine. How do I tell if it’s the one exhaust or 2 exhaust. I’m a newbie as well so take it easy on me lol

[whitehead249]

[whitehead249]

And is there a way I can tell without taking the power head off

[rock]

Welcome to the site. Don't understand 1 exhaust or 2 exhaust. Are you meaning 1 pc adapter plate as opposed to 2 pc adapter plate?

Rock

[whitehead249]

Yes sir sorry about that

[rock]

You have a two pc adapter.

Rock

[whitehead249]

Alright I didn’t know if there was a reason it didn’t have the t stats and no poppit valve. it also has the screw in the poppit valve and t fitting coming from the popit valve out the motor.

[whitehead249]

It has 2 piss holes.

[David - WI]

You have a two pc adapter.

Rock

Is that really an '88 200? Shouldn't the exhaust divider cover and (two-piece?) heads be painted black???

[OnPad]

Looks like a high strung performance engine that might have been on a 1 piece plate in a previous life, with no poppet, or thermostats.

The engines I have experienced with two piece plates, have the poppet hose go to the top of the block, or the poppet cover has a plug with no hose. The hose that comes from the thermostats has a T to the adapter plate, and telltale. Your plumbing might have something to do with overheating? What is your water pressure?

What happens at 1/4 throttle, is the timing is fully advanced, and the engine is under extreme load. This makes heat, or even detonation. If this is something that is done often, or for long duration you should lower the timing, and run a smaller prop. That thing likely has a little more timing than your average fishing engine.

[whitehead249]

Could they have drilled the plate and done the cooling mods I have seen in other threads?

[whitehead249]

I did replumb it the way you said after I put Tstats and poppit valve in it. I was thinking they have done the 2 plate dry stack mod. Can someone send me a good water pressure and temp gauge I mine don’t work on the boat at the moment as you can the water gauge hose was dry and broke off but I know the water pressure gauge and temp gauge don’t work.

[rock]

Is that really an '88 200? Shouldn't the exhaust divider cover and (two-piece?) heads be painted black???

I was somewhat confused by the bare block and 1 pc heads also. If it's an 88 200 it's certainly not a fishin motor.

Rock

[whitehead249]

Where do you tell exactly the year model?

[LakeFever]

There’s two large letter stamps on the block near the throttle arm and a frost plug looking deal on the top of the block with numbers and whatnot. Post those and the fellas here can tell you what the block started out as anyways.