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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. |
Spark Problems
Discussion at Motorized Bicycle Engine Kit Forum in the Motorized Bicycle Trouble Shooting forum. I recently determined my CDI [i]and[i] magneto were bad so I replaced both. Now with the replacement parts ...  | | 
02-11-2009, 06:13 PM
| | Motorized Bicycle Member | | Join Date: Oct 2008 Location: Pennsylvania, USA
Posts: 23
| |  Spark Problems
I recently determined my CDI [i]and[i] magneto were bad so I replaced both. Now with the replacement parts installed I only have spark with the plug out while i'm holding the plug...  which shocks me mind you... HELP PLEASE!!! |
02-12-2009, 01:26 AM
| | Motorized Bicycle Member | | Join Date: Jul 2008
Posts: 41
| |  Re: Spark Problems
If your getting bit when it's out, should mean it is sparking in engine. Did you change plug and wire ? Wire may have a break in it when positioned different. Is is getting fuel. What kind of engine ?
Hang in there. |
02-12-2009, 10:50 AM
|  | Motorized Bicycle Elite Member | | Join Date: Jan 2008 Location: Arizona Bullhead
Posts: 361
| | Re: Spark Problems
How did you determine the cdi was bad?
Do not allow the plug to spark ungrounded.
With the sparkplug wire connected to the plug. Firmly press the threaded part to the bare metal cooling fin while watching the spark plugs GAP. Now let the clutch out. Gently push the bike forward. Did you see a spark??? Keep trying until you either see a spark or you are sure you did NOT .
You will probably wind up buying another cdi. |
02-12-2009, 01:12 PM
|  | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 2,685
| | Re: Spark Problems
What plug and wire? |
02-12-2009, 09:07 PM
| | Motorized Bicycle Member | | Join Date: Oct 2008 Location: Pennsylvania, USA
Posts: 23
| | Re: Spark Problems
Quote:
Originally Posted by biken stins  If your getting bit when it's out, should mean it is sparking in engine. Did you change plug and wire ? Wire may have a break in it when positioned different. Is is getting fuel. What kind of engine ?
Hang in there. | Yeah i purchased a high performance plug and wire. It is getting fuel... I can smell it when i push the bike with the plug out. It is an 80cc Chinese engine from BoyGoFast. |
02-12-2009, 09:12 PM
| | Motorized Bicycle Member | | Join Date: Oct 2008 Location: Pennsylvania, USA
Posts: 23
| | Re: Spark Problems
Quote:
Originally Posted by spad4me How did you determine the cdi was bad?
Do not allow the plug to spark ungrounded.
With the sparkplug wire connected to the plug. Firmly press the threaded part to the bare metal cooling fin while watching the spark plugs GAP. Now let the clutch out. Gently push the bike forward. Did you see a spark??? Keep trying until you either see a spark or you are sure you did NOT .
You will probably wind up buying another cdi. | I tested the CDI and magneto with a meter and compared them with readings people got on this forum. I got open for all readings concerning the blue wire on both the CDI and magneto. Which would mean that they're both bad. I got back from work late today so I was unable to try your idea. If I don't get a spark does that mean the brand new CDI is bad? When it sparks while i'm touching the threaded part of the plug, my left hand which is holding the handlebar sometimes also gets shocked. I'm puzzled. I have the black wire of the magneto on the lower left screw that holds it in... is that correct?  |
02-12-2009, 09:29 PM
| | Motorized Bicycle Elite Member | | Join Date: Mar 2008 Location: Ontario
Posts: 551
| | Re: Spark Problems
Seeing as you have the same problem as you began with, I would be asking myself if it was something else right from the start. Wiring? |
02-13-2009, 11:23 AM
|  | Godfather of Motorized Bicycles | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
Posts: 7,121
| | Re: Spark Problems
If you are getting spark while grounding yourself to the bike, you are getting spark while the plug is screwed in.....
__________________
If it ain't broke, and you mess with it long enough, it will be.
Last edited by Bikeguy Joe : 02-13-2009 at 11:27 AM.
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02-14-2009, 03:50 PM
| | Motorized Bicycle Member | | Join Date: Oct 2008 Location: Pennsylvania, USA
Posts: 23
| | Re: Spark Problems
Thanks for the help everyone I finally got it up and running yesterday. Only thing now is it runs kinda rough at full throttle - seems like it bogs down. Any ideas? |
02-14-2009, 05:57 PM
|  | LORD VADER Moderator | | Join Date: Jan 2008 Location: pampa texas
Posts: 2,095
| | Re: Spark Problems
is it running a little rich? mainjet size might be too big. | | Thread Tools | | | | Display Modes |  Linear Mode | 
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