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Author Topic:   1981 rebuilt
bennyv posted 03-22-2004 11:13 AM ET (US)   Profile for bennyv   Send Email to bennyv  
I recently traded in my 1977 200 HP Johnson for a rebuilt 1981 200 Johnson. To my surprise the 1981 is slow, eats more gas, and I have not been happy. The marina told me they put on a low compression gasket beause of the fuel problems they see with todays gas - they also said I need to put another 20+ hours on the motor and I should gain more power. The 1977 would pull the ski rope out of my hands and the 1981 does not even get me up - it is not the prop - it appears to be the motor. Does this sound right? Any one have experiance with a low compression gasket - should I swap it out with a "normal" gasket? Is a 1981 Johnson a good motor?
Joe Kriz posted 03-22-2004 05:35 PM ET (US)     Profile for Joe Kriz  Send Email to Joe Kriz     
benny,

I don't think the Low Compression Gasket will give you any noticeable less HP.

I have done this on my 1985 150 HP Evinrude and discussed this in another thread.. Here is the quote from that thread:

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"I have a 1985 Evinrude 150 that was designed to run on the middle grade of 93 Leaded octane fuel .. The engine always sounded like it was pinging more then it should even though I was using that grade fuel but Unleaded. My mechanic said there is a outboard bulletin out that states you can put in "thicker" head gaskets to reduce the amount of compression in the engine and then use the lower grade 86AKI Unleaded fuel. Outboard Bulletin #2155.

I ordered a pair of this head gaskets and installed them myself.. Very simple. I cannot believe how quiet the engine runs now. It is unbelievably quiet compared to what it was.. Almost sounds like a 4 stroke when cruising as I have no problems having a converstaion with other people on board. I can now also run the lower 86AKI Unleaded fuel which costs about .10 cents less a gallon.. 60 gallons equals a $6.00 savings per tank.

I may not have the total 150 hp as it used to produce, but I surely can't tell the difference... Also, the newer engines aren't included in any of the above.."
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I have not noticed any difference in top end speed although I do not have a GPS to calculate exact top end.. My engine has plenty of power... I am not sure why your engine does not have the power to pull a skier up...

greyg8r posted 03-22-2004 08:34 PM ET (US)     Profile for greyg8r    
I see no reason to believe that 20+ hours will increase the horsepower. This would suggest that the rings are "breaking in", which I believe is an old wives' tale (sorry PCers)! When I rebuilt my 1981 Evinrude, it did not gain any power after 20 hours.

Richard

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