craftsman 5/20 starting problem.


Old 01-16-11, 02:45 PM
Thread Starter
Join Date: Jan 2011
Location: canada
Posts: 87
craftsman 5/20 starting problem.

Been gonig at the snowblower all weekedn trying to get it started. It starts, it runs. Not for long though.
After getting blisters on my hands from trying to pull start. I decided the only thing to do was build a homemade elctric start with my drill. Works like majic. No more blisters.
The engine wont start on full throttle and full choke. Plenty of gaS, IT BACKFIRES AND i CAN SMELL IT. i go to half to nill throttle and she runs for a little bit. then dies again. When she runs, i give a little more throttle then she dies again.
I just cant seem to keep her running.
I have rebuilt the carb. Adjusted main jet to 1 and a half turns, adjusted low idle at 1.5 turns, still cant get her going.
I have also given more and less fuel with the main jet and still have no luck.
It almost seems as thuogh when i give lots of throttle, attempt start, ease off on throttle, she will fire and run for a little. Once runnnig and more throttle, she dies.

Any ideas on where or what I should do next?

Need a hand here, i am really trying to glick this one and learn something.

I have rebuilt the carb as well.
Sponsored Links
Old 01-20-11, 07:11 PM
Join Date: Jul 2007
Location: Oklahoma City
Posts: 35
If it backfires, I would inspect the flywheel sheer key. The sheer key can be sheered as little as almost not noticeable by the naked eye and it will cause problems.

Good luck!
Old 01-21-11, 09:11 AM
Join Date: Jun 2006
Location: St. Louis
Posts: 2,365
I will guess this is a Tecumseh engine, when you were cleaning the carb did you clean the tiny hole in the main jet, it is near the top and almost invisible on some, refer to the pic below for reference only as there are several styles, I use the wire from a twist tie to clean it. Have a good one. Geo

Old 01-21-11, 11:17 AM
Join Date: Jan 2005
Location: Texas
Posts: 478
Sounds like the intake valve isn't closing completely. If you can get it to run long enough, try feeding some marvel mystery oil thru the carb intake while it's running. This will usually free up sticking valves.

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