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Name:	roswellric -	Reply
Subject:	OK I really need help.....
Date:	9/18/2005 9:23:50 PM

I have a 93 Evinrude 115 HP V-4 that has a new powerhead. At anything below 4500 RPM I get an intermittent vibration from the motor that is very noticeable. Feel it in the the floor of the pontoon boat. Hear it. No discernable drop in RPM when staring at the tach when it vibrates.

Is propped to run 5200 RPm at WOT. It seems to run fine at WOT and over 4500 RPM, Idles OK, starts kinda OK (needs a bulb prime when cold).

Been in the shop off and on all summer and has new plugs, wires etc.
What 's up? It's driving me crazy.....

Name:	4thelake -	Reply
Subject:	OK I really need help.....
Date:	10/2/2005 3:05:38 PM

This is a wildshot but it may be a harmonic issue. Has your prop been redone, or are the bolts that hold the motor on loose? Does the motor run good other than the vibration? The floor of the tooner may be loose as well. All sorts of guesses but the grand total cost of this repair is zero if you look at it yourself.

Name:	roswellric -	Reply
Subject:	OK I really need help.....
Date:	1/3/2006 1:03:48 PM

Thanks! That's a pretty good idea. The shop finally found the problem... a recirculating line from the crankcase back to the carbs that was never re-connected. Hidden under the bottom carb. Runs fine now. I wonder why it took the whole summer to find though....

Name:	CAT BOAT -	Reply
Subject:	next time
Date:	1/10/2006 10:42:40 PM

Ros,I never check this part of forum, if you need help in the future, let me know. I will be glad to help you here at my shop.
CAT

Name:	roswellric -	Reply
Subject:	next time
Date:	3/28/2006 9:55:30 PM

I will thanks...you sound like a straight shooter....hard to find.

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