rude vibrates @low rpm,s

myles carey

Seaman
Joined
Apr 29, 2003
Messages
60
in the water my evinrude seems to vibrate when i start to take off.when i gun it, it jumps up and flies.would the lower unit be faulty?Ive tried three diferent props on this 1981-140hp
 

Yepblaze

Lieutenant Commander
Joined
Jun 1, 2001
Messages
1,686
Re: rude vibrates @low rpm,s

A vibration during initial acceleration may be a cylinder dropping out, or not firing properly during high demand.<br /><br />Go through the basics like a compression test. Plug check for color and spark. Do a cylinder balance test by disabling each cylinder one at a time and loking for similar results.<br /><br />Make sure link and snyc, and ignition timing is set correctly as stated in you particular manual.<br /><br />Maybe a fresh set of plugs will mask another maladay at least temporarily.
 

myles carey

Seaman
Joined
Apr 29, 2003
Messages
60
Re: rude vibrates @low rpm,s

I pulled the heads replaced the gaskets it looks good high compresion-one bank is 130 the other is120. is decarbination nesasarry? it was just timed at the shop, runs great, idles nice.
 
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