Engine troubles

Mensa · 07-17-09, 05:01 PM

My engine starts fine and everything but when I get it up to near full throttle it suddenly shakes violently and loses a lot of thrust, if I lower the throttle a bit it returns to normal.

Any ideas?

nofearengineer · 07-17-09, 05:23 PM

Sounds like it could be a prop problem, but that's just a guess.

Mensa · 07-17-09, 05:27 PM

Could be, but I would think it would shake more and more up to the point of full throttle instead of suddenly starting when I hit a certain point.

nofearengineer · 07-17-09, 07:15 PM

Quote:

Originally Posted by Mensa

Could be, but I would think it would shake more and more up to the point of full throttle instead of suddenly starting when I hit a certain point.

You know, I have an 18' boat with a 115 on it, and there is a certain speed and rpm that my boat will start to shiver. I think it has to do with the resonant frequency of the motor, the boat, the two of them together, or who knows. I don't know if this is what you're experiencing, but I don't think there's anything I can do about mine.

zooker · 07-18-09, 07:47 PM

spun hub... check your prop the rubber hub is torn...

zooker

1FASTLASER · 07-21-09, 07:11 AM

What prop do you have on the boat bud. Also need to know what 115hp motor do you have. I know its a 115 but what .....mercury,omc yamaha .......which one. If its a certain year 115 Merc 115.............the one they called the 2+4 I know what yopur problem is. Lemme know the answers to the questions I asked and will get ya running.

Mensa · 07-22-09, 12:59 PM

It's a mercury 200 (20hp) thunderbolt edition

1FASTLASER · 07-23-09, 05:41 AM

Check your hub like Zook said. I musta read the post wrong thinking you had a 115. Visually look at the rubber hub portion.........prolly see your problem.

07-17-09, 05:01 PM	#1
Mensa BassFishin.Com Member Join Date: Jun 2008 Location: Hendersonville, TN Posts: 20	Engine troubles My engine starts fine and everything but when I get it up to near full throttle it suddenly shakes violently and loses a lot of thrust, if I lower the throttle a bit it returns to normal. Any ideas?

07-17-09, 05:23 PM	#2
nofearengineer BassFishin.Com Premier Elite Join Date: Mar 2009 Location: Southwest IN Posts: 5,630	Sounds like it could be a prop problem, but that's just a guess. __________________ Many men go fishing all of their lives without knowing it is not fish they are after.

07-18-09, 07:47 PM	#5
zooker BassFishin.Com Premier Elite Join Date: Jan 2004 Location: denton nc Posts: 13,441	spun hub... check your prop the rubber hub is torn... zooker __________________ the godfather.. aml in remission since 7-20-09

07-21-09, 07:11 AM	#6
1FASTLASER BassFishin.Com Super Veteran Join Date: Aug 2005 Location: crossett,arkansas Posts: 2,777	What prop do you have on the boat bud. Also need to know what 115hp motor do you have. I know its a 115 but what .....mercury,omc yamaha .......which one. If its a certain year 115 Merc 115.............the one they called the 2+4 I know what yopur problem is. Lemme know the answers to the questions I asked and will get ya running. __________________ Laser's rule with Merc's doing the pushing..........KEEP THE WETSIDE DOWN AND THE DRY SIDE UP!!!!!!

07-23-09, 05:41 AM	#8
1FASTLASER BassFishin.Com Super Veteran Join Date: Aug 2005 Location: crossett,arkansas Posts: 2,777	Check your hub like Zook said. I musta read the post wrong thinking you had a 115. Visually look at the rubber hub portion.........prolly see your problem. __________________ Laser's rule with Merc's doing the pushing..........KEEP THE WETSIDE DOWN AND THE DRY SIDE UP!!!!!!

07-17-09, 05:27 PM	#3
Mensa BassFishin.Com Member Join Date: Jun 2008 Location: Hendersonville, TN Posts: 20	Could be, but I would think it would shake more and more up to the point of full throttle instead of suddenly starting when I hit a certain point.

07-22-09, 12:59 PM	#7
Mensa BassFishin.Com Member Join Date: Jun 2008 Location: Hendersonville, TN Posts: 20	It's a mercury 200 (20hp) thunderbolt edition

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