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Posts: 294
Location: New Jersey | Hey Gang,
I have a 50 HP 2003 Johnson 50HP 4 stroke. If i put it in neutral and increase the rpm's it shakes left to right (pretty violently at 4500 rps). I dont know how it runs wide open (as i cant get on a #*^@ lake to find out).
Is there any chance this is normal?? I have to be honest, i never did this before. She starts fine and there is no warning indicator that anything is wrong.
Any info would be helpful. The engine has 25 hrs on it, i barely use the thing. Always using my 9.9.
Thanks, Rob |
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Posts: 2323
Location: Stevens Point, WI | Yes, this is normal when you rev the motor like that in neutral. Typically, the only reason you'd want to rev the motor like that is when you first start the motor for the first time each day and it's a cold blooded motor. This isn't anything I'd be worried about because revving your motor that high isn't something you do on a regular basis in order to run the boat. Everytime I've ever had to rev a motor in order for it to warm up, it shakes violently like yours. |
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Posts: 295
Location: Southern Ontario, Detroit River and Lake StClair | I wouldnt say its normal but if your running it on muffs I wouldn't get too worried about it until you try it in the water. I've had motors run like crap on muffs only to purr like a kitten in the water. The water creates to the proper exhuast back pressure for the motor to run like it was designed to. When its on muffs your not getting that.
Good Fishin'
Tim
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Posts: 95
| I had a problem with my 2000 Honda 4-stroke last season. There were no warning lights (or noises) on but I found out that I had issues with the oil and the engine limiter would come on and off, at different speeds while on plane, and I could not figure out why. It would do the same in neutral. The limiter would make the engine shake and keep the rpms low. I changed the oil at the beginning of the season but for some reason it was "dry" and no warnings went off. After I did another oil change the engine has been working better than ever and the rpm limiter has not gone off.
Chas Martin
http://www.muskymastery.com |
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Posts: 1756
Location: Mt. Zion, IL | TJ DeVoe - 11/23/2009 4:24 PM
Yes, this is normal when you rev the motor like that in neutral. Typically, the only reason you'd want to rev the motor like that is when you first start the motor for the first time each day and it's a cold blooded motor. This isn't anything I'd be worried about because revving your motor that high isn't something you do on a regular basis in order to run the boat. Everytime I've ever had to rev a motor in order for it to warm up, it shakes violently like yours.
don't ever rev a cold engine to high rpms. you risk spinning a crank shaft bearing and your motor might as well be toasted. ask any mechanic (my father is a FAA and ASE certified mechanic). |
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