Go Back   DIY Go Kart Forum > Building Plans And Advice > All Other Parts


Thread Tools Display Modes
Old 03-26-2020, 11:59 PM
Braydon.a68 Braydon.a68 is offline
Junior Member
Join Date: Mar 2020
Location: Mission, British Columbia
Posts: 1
Thanks: 1
Thanked 0 Times in 0 Posts
Default Shifter kart pulse pump NPT brass fitting

New to the forums so Iím just getting a grasp of things.

Anyways, I was wondering about the NPT brass fitting Iím using for my fuel pump on my homemade shifter kart. Specifically, whatís the best way to seal it and keep it from backing out due to vibrations? I have drilled and tapped a hole into the head of my motor infront of the carb near the reed valves (copying the KZ race kart fuel system directly), and had originally Teflon taped it and tightened it down. However, because of the vibrations (using a Ď77 YZ400 2-stroke so lots of vibrations) it rattled loose and created a Ďvacuumí leak which in turn allowed extra air into the cylinder turning it way lean and burned hot and had a kind of a runaway motor (was able to choke it after hitting kill switch and ripping the spark plug boot off only to realize it didnít kill it). What should I use to keep it in? Also Iím thinking Teflon tape might not have been enough either and was thinking Teflon paint or something else to seal it. Iíd like to hear what you all have to say.

Reply With Quote
Old 03-27-2020, 07:25 AM
anickode's Avatar
anickode anickode is offline
Senior Member
Join Date: Apr 2010
Location: S.E. Michigan
Posts: 2,170
Thanks: 86
Thanked 945 Times in 662 Posts

Teflon tape is a lubricant, not a sealant. Common misconception.

Loctite 545 purple thread sealant would be a good choice. It's made for hydraulics and pneumatics. High working pressure, and will cure on oil contaminated surfaces.
"Well that would be a bomb."
Reply With Quote
The Following 2 Users Say Thank You to anickode For This Useful Post:
Braydon.a68 (03-27-2020), pearl111 (03-28-2020)

Thread Tools
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

All times are GMT -6. The time now is 02:04 AM.