OMC Questions you motorheads

[RidgeRunner]

That probably is the old 70 hp Johnson. Lost the 70 rating when they went to prop shaft hp. in the late 80's. What you have is the 3 cyl 3 carb they are tough as a cut nail.

[spareparts]

depends on what needs to be replaced, sorry for the empty answer, but depending on whats damaged inside will make a major difference, last one I did, I charged $1800

[phatdaddy]

i have also found in-line 3 cyl don't like to idle , so don't spend a lot of time & money trying to get it silky smooth.

[THEFERMANATOR]

Originally Posted by phatdaddy

i have also found in-line 3 cyl don't like to idle , so don't spend a lot of time & money trying to get it silky smooth.

I have yet to see an OMC looper that likes to idle really good. As far as rebuild costs, it's a crap shoot as to what all it will need when you do it. A basic kit will set you back probably $450-550 plus machining, but if there is any other damage it can get REAL costly. As far as making it a 70HP, I'm sure it's doable but I believe you have to pull the powerhead off and modify the tuner can and swap the carbs. Some also used different cylinder heads and exhaust timing to get the extra oomph.

[Stinky_Hooker]

Thanks guys, it is the 3cylinder I didnt know that about the older 70's. Always thought this one looked identical. Im wont ever open it up till it needs it. It does idle pretty good though once it warms up.

[spareparts]

there were some cooling system mods on those 3cyl engines, you remove hte piss hose from the exhaust plate and move it to the top of the block, if it doesn't have a tapped boss for teh hose fitting, you need to drill and tap it for the fitting.

[THEFERMANATOR]

Originally Posted by Stinky_Hooker

Thanks guys, it is the 3cylinder I didnt know that about the older 70's. Always thought this one looked identical. Im wont ever open it up till it needs it. It does idle pretty good though once it warms up.

OMC made that same basic 3 cylinder since 68 when they came out with the first 3 cylinder loopers. The engines have seen alot of improvements over the years, but the basic design remains the same.

[Stinky_Hooker]

I have know this one for about 5 years and its always been solid as a rock and super dependable. I hope it keeps on for me!