100hp & 115hp johnson's

[likearock]

hi all,<br /> i have both a 100hp and a 115hp johnson outboards. the 100 is a 1979 and the 115 is a 1977. i was just wondering what the major differences were between the two? are they the same bore and stroke?<br /> thanks again, LIKEAROCK

 

[Big Rod]

Re: 100hp & 115hp johnson's

Same bore and stroke, exhaust improvements and carbs.

 

[mbb]

Re: 100hp & 115hp johnson's

I had a 79 evinrude 100. IMHO Best motor ever made. Put around 2000 hrs on my motor between 79 and when I sold boat in 91, never cleaned a carb, never decarbonized, changed lower unit oil once, and water pump impeller once. It just ran. A bit finnicky to start in morning, but then would fire as soon as you touched the switch all day. Was a bit of a gas hog too at WOT. Wish they still made motors like that one. Bet its still running today.

 

[adrian bick]

Re: 100hp & 115hp johnson's

Major difference in the centre crankshaft bearing.The 79 V4 blocks got the same bearing as the V6, The 77 had a much smaller bearing.