Return to the Tool Shed Forum | Post a Follow-Up

 o
3.5 Briggs & Stratton runs w/o a carb�s welch plug

Posted by loger (My Page) on
Mon, Apr 18, 11 at 16:45

Is it common for a 3.5 Briggs & Stratton to run w/o a carb's welch plug? The plug that is missing will let you see 2-3 very small holes with daylight just inside the choke plate to carb area. It appears there was a plug in place at one time due to lack of paint and no grime. The engine seems to run ok even though you have the machined air metering holes behind where the plug once was. Since my small engine work (since 1970) I h/n seen a plug missing or replaced one. I feel I have seen the plugs in 2-cycle carb kits vs 4-cycles. Please share your experiences with welch plug missing or welch plugs period on old Briggs engines.

Engine's Specs: B&S 3.5, Model # 90702, Type 305801, Code 8733002

Thanks! loger


Follow-Up Postings:

 o
RE: 3.5 Briggs & Stratton runs w/o a carb�s welch plug

  • Posted by baymee LehighValleyPA (My Page) on
    Thu, Apr 21, 11 at 5:13

Probably one of those holes comes off the idle circuit and maybe the engine doesn't need the other two for high speed. It's probably running lean.


 o
RE: 3.5 Briggs & Stratton runs w/o a carb�s welch plug

loger: It would probably be smart to seal off this port. You can use tape to check effect on performance then use a silicone for better longer term sealing or purchase another welch plug .


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Tool Shed Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here