'81 or '78 200 Evinrude Problems

[tinyrogerd01]

Me and my padnuh bought an older Robalo and it has a 200 evinrude, ID numbers confirm it is an '81, but the spark advance says 1978.... so...

When we bought it, it had been stripped of the wiring harness and two coils. We replaced the harness, coils (not new), cleaned the cooling system, changed the water pump, cleaned and rebuilt the carbs, changed one power pack. The motor runs and sounds great on the water hose.
We backed the boat in the water yesturday, still tied down to the trailer, cranked it up, put it in gear and it wanted to run. Gave it throttle and almost pushed the boat and truck out of the water. Put it in reverse and almost pulled the truck in the water. We did this several times.

We unhooked the boat from the trailer, backed it off in the water, put in reverse, went backwards, then shifted forward and it died. Then it did not want to start without starting fluid. We checked the plugs and found one bad coil, but that should have still let it run.

We got home, checked compression, it was good at 110 psi across the board.

We went to start the motor and just barely touched the key... VROOOOM!!
It started without hesitation. We put the hose on it and it acted like nothing was wrong.

Sorry for the long post.. My question is..

When we backed the boat in, water came over the top exhaust port, can water get in there and make up some kind of back pressure and cause the motor not to run?? It sounds kinda funny how we can take the boat immediately home and crank it up with no problems, after all the water has "drained out"....

Please Help !!!

Thanks, Tiny

BTW, It smokes real good (bad?) but when we crank up the kicker (20 hp Merc) it does not smoke even half as good (bad?) and both come off the same fuel supply.

 

[tashasdaddy]

Re: '81 or '78 200 Evinrude Problems

#1 on muffs in the driveway the is not backpressure on the exhaust. it has to idle high on muffs, then the idle has to be set with the motor in the water, and in gear preferable 650-750 rpms. the exhaust exits the prop and relief holes, so when under water yes there is backpressure.

 

[tinyrogerd01]

Re: '81 or '78 200 Evinrude Problems

We have had to "set" the idle in the water. The back-pressure I was referring to on the exhaust was the Top exhaust ports.. the ones that are not submerged. Can water getting in there cause the motor not to run???

#1 on muffs in the driveway the is not backpressure on the exhaust. it has to idle high on muffs, then the idle has to be set with the motor in the water, and in gear preferable 650-750 rpms. the exhaust exits the prop and relief holes, so when under water yes there is backpressure.

 

[tashasdaddy]

Re: '81 or '78 200 Evinrude Problems

no. that is a relief port for the exhaust, for when the motor is idling, and there is not enough exhaust pressure to force it out the prop. what water goes in there just comes out the prop.