| Author |
Message |
    
jennifer nicole devenny
New member
Username: merc1500
Post Number: 1
Registered: 11-2007
| | Posted on Sunday, November 18, 2007 - 12:27 am: | 
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i m a dealer in virginia and i have al ways wondered if it was possible to make the 3.5 run smoother i know that the crank is not correctly balenced has anyone moded one to make it run smoother |
Tohatsu Guru
Member
Username: tohatsu_guru
Post Number: 36
Registered: 06-2007
| | Posted on Sunday, November 18, 2007 - 08:59 am: |
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The crank is correctly balanced for a 1 cylinder engine. Statements like "i know that the crank is not correctly balenced" are lot like saying "are you feeling better since your husband stopped beating you". If the premise is incorrect what follows will not be correct. |
merc1500
Member
Username: merc1500
Post Number: 8
Registered: 11-2007
| | Posted on Thursday, November 22, 2007 - 08:52 pm: |
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they run really rough compared to other 1 cylinders |
Tohatsu Guru
Member
Username: tohatsu_guru
Post Number: 44
Registered: 06-2007
| | Posted on Thursday, November 22, 2007 - 09:06 pm: |
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No, actually they do not. I have run every one cylinder outboard that has been in production over the last 30 years and they all run the same regardless of brand...Awful....When compared to two cylinder ehgines in the same hp. |
merc1500
Member
Username: merc1500
Post Number: 9
Registered: 11-2007
| | Posted on Thursday, November 22, 2007 - 09:30 pm: |
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huh maybe i just have a messed up flywheel then cause my 3hp yahama 2 stroke runs alot smoother and the 5hp nissan 2 stroke much smoother but i all my days of running the 3.5 nissan i have found that some are smoother than others but they still are rough compared to 1989 3hp yahama and the 5hp nissan i have few flywheels lying around mine is just rough i have tried adjusting the carb needle inside the carb have got it alittle better still one of the roughest ones i have ever worked on |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 2853
Registered: 09-2006
| | Posted on Sunday, November 25, 2007 - 03:29 am: |
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how about the motor mounts? |
merc1500
Member
Username: merc1500
Post Number: 10
Registered: 11-2007
| | Posted on Sunday, November 25, 2007 - 09:53 am: |
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there are no motor mounts on this engine well there are none from the factory im going to try to put some to help |
Tohatsu Guru
Member
Username: tohatsu_guru
Post Number: 45
Registered: 06-2007
| | Posted on Sunday, November 25, 2007 - 09:54 am: |
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Engines do not run rough because of the flywheel balance. They could...But that is never the reason. There are a variety of things that could be the source, but on a small outboard it is usually a carb issue where the engine float needle is worn. It could also be that the engine is simply not set high enough at idle. We see a lot of small engines where people have set the idle down too low. The engines run, but they shake...badly. |
