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| Motorized Bicycle Trouble Shooting Use this area to post problems that may arise that you could use some help in figuring out what is wrong with their bicycle motor and what needs to be done to achieve top performance. |
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07-25-2008, 01:55 PM
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Motorized Bicycle Member
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Join Date: Jul 2008
Location: spring tx horth suburb of houston
Posts: 29
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questions abound!
ok so i found the manual for my motor online and it says to set the idle @ 2400rpm. how do i know where that is? also, it says to adjust the main jet to deliver at high load/high rpm. how do i give a high load at high rpm and STILL adjust the carb? it is a mitsu 41cc 2-stroke 39x34 with a max of 7k rpm. help!
Last edited by jonboy2five; 07-25-2008 at 02:01 PM.
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07-25-2008, 02:27 PM
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Godfather of Motorized Bicycles
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Join Date: Jan 2008
Location: Ashtabula county, Ohio
Posts: 10,864
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Re: questions abound!
The second question is easy- tune and test, tune and test.
The first question is a little harder unless you know a shop with a tune up tach that works for a single cylinder engine.
The only other way is to use an optical tach like the ones used for model planes and then your going to have to do a bit of imaginating to get it to work....but I have done it for temporary useage.
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If it ain't broke, and you mess with it long enough, it will be.
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07-25-2008, 02:46 PM
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Motorized Bicycle Elite Member
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Join Date: Jun 2008
Location: Longmont, CO
Posts: 1,596
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Re: questions abound!
I just tune by ear. When it sounds like 2400rpm, it's good 
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07-25-2008, 03:10 PM
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Godfather of Motorized Bicycles
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Join Date: Jan 2008
Location: Ashtabula county, Ohio
Posts: 10,864
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Re: questions abound!
Very funny.
__________________
If it ain't broke, and you mess with it long enough, it will be.
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07-25-2008, 03:26 PM
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Motorized Bicycle Elite Member
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Join Date: May 2008
Location: north bend wa.
Posts: 404
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Re: questions abound!
searct tachometer they are available
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07-25-2008, 03:53 PM
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Motorized Bicycle Elite Member
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Join Date: Jun 2008
Location: Longmont, CO
Posts: 1,596
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Re: questions abound!
Quote:
Originally Posted by Bikeguy Joe
Very funny.
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What's so funny?
I can tell you what a 4cyl at 900rpms sounds like, and an inline 6 at 700rpms...you get used to it after a while. It's not like the idle has to be EXACTLY 2400 rpms anyway
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07-25-2008, 04:17 PM
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Motorized Bicycle Member
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Join Date: Jul 2008
Location: spring tx horth suburb of houston
Posts: 29
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Re: questions abound!
ok thanks guys at least i get to "tune" it to idle low but consistent, right? as for the high rpm i have already gotten it close, in the last 3 hours of fiddling!!! btw i find this forum better suited to me than the " other one" 
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07-25-2008, 04:25 PM
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Motorized Bicycle Elite Member
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Join Date: May 2008
Location: north bend wa.
Posts: 404
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Re: questions abound!
sucking up works sometimes, also reading what has been posted on a certain idea or issue can help
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07-25-2008, 10:53 PM
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Motorized Bicycle Member
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Join Date: Jul 2008
Location: spring tx horth suburb of houston
Posts: 29
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Re: questions abound!
thanks mr 13.
Last edited by jonboy2five; 07-26-2008 at 02:28 AM.
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07-26-2008, 11:26 AM
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Godfather of Motorized Bicycles
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Join Date: Jan 2008
Location: Ashtabula county, Ohio
Posts: 10,864
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Re: questions abound!
Quote:
Originally Posted by jasonh
What's so funny?
I can tell you what a 4cyl at 900rpms sounds like, and an inline 6 at 700rpms...you get used to it after a while. It's not like the idle has to be EXACTLY 2400 rpms anyway |
I know you can, I can set the ultralight engines that I work on to idle around 2000. I guess I was just being a dumbass, sorry. 
__________________
If it ain't broke, and you mess with it long enough, it will be.
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