Visit The Outboard Wizard’s website for genuine BRP OMC Evinrude parts at 10-50% off list prices.
Hi all,

I have a 70s Johnson 135 and one of the cylinders is down in compression (@90 PSI while the other three are at 140 PSI). It still runs, but it won't idle for long, and won't maintain speed with the throttle wide open. I opened the head and discovered that the piston is damaged and there is slight scoring visible in the cylinder. I have found a 70s 85hp powerhead for sale which is apparently in good shape with good compressions and is going cheap. Can I take out my powerhead and put the 85 hp in? My understanding is that the 85hp - 135hp motors from '73-'77 were nearly identical.

If it is possible, I intend to do the job myself as an alternative to rebuilding the 135hp. I don't really need the power of the 135hp anyway.

Quote 0 0

Hello if 85 hp powerhead includes carbs it can replace 135

Ralph, The Outboard Wizard
Owner, Lindenhurst Outboard Service Inc. since 1979 +
Websites: "Outboard-Wizard" a few domains since 2001 - 
Ebay Store: Outboard Wizard  The Outboard Wizard - Power Seller
You Tube: See me here!
Quote 0 0