Small Engine Problem


Old 07-06-14, 10:33 AM
Thread Starter
Join Date: Jul 2014
Location: United States
Posts: 2
Small Engine Problem

Hello Everyone,
My name is Seth. New to the site. Decided to join after reading how to repair my Riding Lawnmower which I appreciated the the clear answers I found on this site. So here is my question.

A couple of years ago I build for my Son a small motorcycle. I took a small electric motorcycle and added a 22cc scooter/ 2 stroke engine. I don't really know anything specific regarding brand about the engine as I pieced this together as I came across parts. It has disc brakes for front/ back with single lever (cable) that works each caliper simultaneously. Gas is operated by thumb control from a small 4-wheeler.

The rig ran great for a couple of season then last year it began to give me trouble. It wdid not want to idle no matter how much adjustment I attempted. When the scooter runs it does OK if you just let it idle/ very light pressure to throttle and it will move along slowly but as soon as you add throttle it begins to die. If I jack it up and keep the back wheel off the ground I can get it nearly to full throttle then it just dies. No amount of "feathering" of the throttle will keep it going. I have taken the car apart and cleaned it. I changed the gas and made sure I was working with a fresh tank. I am stumped as to what is going on and why I can't get it back to full operation. This little machine would run like a demon....It has 10 inch tires (top to bottom) and with me would hit 35mph (maybe faster if I would have had more road). My son really want this thing running again and so Do I but I have spent countless hours trying to fix the problem and cannot. I would appreciate any help or ideas very much.

Thanks for the help
Sponsored Links
Old 07-06-14, 07:04 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,575
How much compression does it have? Might check to be sure the exhaust isn't clogged. If both check out, I would suspect carburetor problems.
Old 07-07-14, 11:14 AM
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 16,691
I would first look at the exhaust like Cheese mentioned. Long ago I had a small 2 stroke engine that would plug the spark arrestor screens in the exhaust. It became part of my maintenance and I'd clean it out once a season.
Old 07-07-14, 01:11 PM
Forum Topic Moderator
Join Date: Mar 2005
Location: USA
Posts: 42,814
I'd also install a new sparkplug. I had a 2 stroke bike 40+ yrs ago that didn't like old plugs, even if you cleaned them well.
Old 07-07-14, 07:34 PM
Thread Starter
Join Date: Jul 2014
Location: United States
Posts: 2

Thanks for the ideas. I never tried the plug as it wasn't that old/ many hours on it as it was sparking fine. But maybe that will play a role. Will definitely try the exhaust repair as it gets very heavy with oil in the discharge. May very well likely be restricted.

Thanks fellas


Thread Tools
Search this Thread
Display Modes
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 On
Pingbacks are On
Refbacks are On

All times are GMT -7. The time now is 07:24 PM.