Idle RPM on 70hp johnson

Javelin 353

Petty Officer 2nd Class
Joined
Dec 28, 2003
Messages
184
I just got my boat out of the shop had all the carbs rebuilt and engine tuned. Idle rpm is about 1100 rpm on the ears. I thought this was a little high. Mechanic said he likes to set older johnnys at that rpm mine is a 1991???
 

rickdb1boat

Supreme Mariner
Joined
Jan 23, 2002
Messages
11,195
Re: Idle RPM on 70hp johnson

You are a little high on with the idle. Better way to check it is in the water in gear. Should be 725+-25 RPM's in gear unrestrained and moving. I too, have a 91 70 HP rude. I believe mine idles in gear about 750-800 RPM's. Easier on the clutch dogs and gears when shifting if the idle is lower.
 
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