43cc scooter will not run propperly help please


Old 09-18-15, 04:14 PM
Thread Starter
Join Date: Jun 2014
Posts: 52
43cc scooter will not run propperly help please

A fried brought me a scooter to help him fix. he said one day it just wouldnt start. After determining it was the coil we ordered a replacement. The scooter now starts but runs really poorly. I tried a coil off a lawnmower and it started right up and ran great but the piston fired the motor and ran backwards.

So we know it runs like a champ with a different coil but with the new coil that is the same as the old dead one no longer runs correctly. It boggs and backfires.
what do you think the issue could be?
Sponsored Links
Old 09-18-15, 06:24 PM
Temporarily Suspended
Join Date: Jul 2008
Location: NY
Posts: 10,986
If it runs good with the lawnmower coil, why do anything else?
Old 09-21-15, 08:36 AM
Thread Starter
Join Date: Jun 2014
Posts: 52
like I said, that coil makes the wheel turn in reverse
Old 09-21-15, 09:33 AM
Forum Topic Moderator
Join Date: Oct 2002
Location: Hamilton County, Ohio
Posts: 4,288
Since a coil's purpose is to raise voltage from a nominal 6 or 12 volts to a high enough voltage to make a spark jump a gap on a spark plug, I am having a hard time visualizing why it would make the engine run backwards. Are you sure there is not some gearing or drive change that happened?
Old 09-26-15, 06:39 AM
Join Date: Jun 2010
Location: Canada (near The Motor City)
Posts: 609
It sounds like the coil is firing the plug but the timing is off.

Having spark is a good thing..... having spark at the right time is priceless.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes