Briggs pulsa-jet carburetor


Old 07-22-06, 03:34 PM
Thread Starter
Join Date: Jul 2003
Location: Montevallo, Alabama
Posts: 590
Briggs pulsa-jet carburetor

What would cause a condition such as this...after rebuilding the carburetor, adjusting the needle valve had very little effect on the running of the engine. In fact only the last 1/4 to 1/2 turn really had the only effect on the engine. Should I have checked the metering holes underneath the welch plug? The numbers on the engine are M-91202, T-0164-01, C-960903FA.
Sponsored Links
Old 07-22-06, 06:36 PM
Join Date: Oct 2004
Location: USA
Posts: 255

At idle; set the idle jet screw in until seated. I'm sure you will get a response. If not, you have a vacume leak.

Old 07-22-06, 10:48 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,815
By the last 1/4 to 1/2 turn, do you mean turned out, or all the way in? Is this on a horizontal shaft engine? Could be air leak, could be carb restriction, behind the welch plug or elsewhere. I've had one or two of these on horizontal engines that refused to come clean. I soaked them over and over, blew out, cleaned welch plugs, sprayed through all passages, cleaned with tip cleaners, and repeated many times, and finally gave up and installed a different carb. It's not something I've had happen often, maybe a time or two, but it has happened. I don't know where the restriction was, but I couldn't seem to find it.
Old 07-22-06, 11:52 PM
Join Date: Oct 2004
Location: USA
Posts: 255
Jack B.,

Agreed! Either 1/4 turn out or 1/4 turn in; it all boils down to the same thing. Cloged jet or vacume leak..... I guess it's up to you to decide?

Old 07-23-06, 09:13 PM
Join Date: May 2006
Posts: 30
sounds like sucking air. check for broken gaskets. make sure your carb is tight
Old 09-26-08, 11:46 PM
Join Date: Sep 2008
Posts: 1
If you didn't wedge the choke plate open before you tightened down the carb-to-tank screws, the diaphragm won't have the correct 'preload' and the choke will be too rich. This is assuming that you assembled the other parts correctly. - Jim
Old 09-28-08, 06:32 PM
30yearTech's Avatar
Join Date: Oct 2006
Location: Central Texas
Posts: 1,176
Just to let you know Jimbeau, you are replying to a post that is over two years old. I am betting that they either figured out the problem or gave up by now.

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