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Loss of high RPM spark?
Discussion at Motorized Bicycle Engine Kit Forum in the Gas Bicycle Engine Kits forum. I have no idea how to read it, but when set on 200K, I get 42.6.
When on 20K, ...  | | 
03-19-2008, 08:00 AM
|  | MODERATOR | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
Posts: 4,073
| |  Re: Loss of high RPM spark?
I have no idea how to read it, but when set on 200K, I get 42.6.
When on 20K, I get 8.9.
Both are blue to plug.
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If it ain't broke, and you mess with it long enough, it will be. |
03-19-2008, 09:09 AM
|  | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 1,663
| | Please measure....
Quote:
Originally Posted by Bikeguy Joe  I have no idea how to read it, but when set on 200K, I get 42.6.
When on 20K, I get 8.9.
Both are blue to plug. | Wow - thanks - another data point. We all get different numbers.....but a pure open doesn't seem right. There must be a diode in there.....and of course some capacitors.....
Others?
I'll probably just buy a new CDI unit, even if I keep one as a spare. |
03-19-2008, 09:16 AM
|  | ADMINISTRATOR | | Join Date: Dec 2007 Location: St. Croix, US Virgin Islands
Posts: 1,820
| | Re: Loss of high RPM spark?
i am going to do the same thing. i hear over and over people haveing problems with thier bicycle engine and it ends up the cdi is bad |
03-19-2008, 10:36 AM
| | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 1,663
| | Re: Loss of high RPM spark?
I think there is only one China MFR of the thing? Right?
I'll shop them - but I don't have my bookmarks of suppliers with me right now. |
03-19-2008, 11:26 AM
| | ADMINISTRATOR | | Join Date: Dec 2007 Location: St. Croix, US Virgin Islands
Posts: 1,820
| | Re: Loss of high RPM spark?
yes only one cdi as far as i know off |
03-19-2008, 12:21 PM
| | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 1,663
| | Re: Loss of high RPM spark?
thatsdax has a great price....need a few other items as well....  |
03-19-2008, 10:34 PM
| | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 1,663
| | Re: Loss of high RPM spark?
Never mind....I got home from work and I reversed the meter leads and got 7.6 meg on blue to plug...so there is some type of diode in there...I think the CDI unit is OK
It started happy as a lark. Sounded good......warmed up slowly jiggling the choke, could rev it OK with choke.....engine warm.....choke almost all the open........give it gas.........gagging low buuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu bowaaaaaaaaaaaaaaa dies. Start and repeat. I think it's the carb.....I tried to get it hot, but it takes awhile...... |
03-20-2008, 07:00 AM
| | MODERATOR | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
Posts: 4,073
| | Re: Loss of high RPM spark?
I still think you have an air leak SOMEWHERE.
__________________
If it ain't broke, and you mess with it long enough, it will be. |
03-20-2008, 07:12 AM
| | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 1,663
| | Re: Loss of high RPM spark?
Quote:
Originally Posted by Bikeguy Joe I still think you have an air leak SOMEWHERE. | And I am agreeing.....it may be at the manifold gasket....need to stop by the automotive place and get some gasket material.... |
03-20-2008, 02:23 PM
|  | Master Motorized Bicycle Builder | | Join Date: Jan 2008 Location: north carolina
Posts: 3,758
| | Re: Loss of high RPM spark?
I happen to agree, I always thought it was. It sounds too much like the problems I had at first. It seems anytime you pull that manifold, you need to just replace the gasket. That's what happened to me. I pulled it and tried to reuse the old gasket. Never did seal so I had to reinstall a cereal box manifold. Clean off the old one carefully so you get a clean flat surface for the new one. | | Thread Tools | | | | Display Modes |  Linear Mode | 
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