« previous next »
Pages: [1]   Go Down

Author Topic: pressure/vacuum test?  (Read 3222 times)

0 Members and 1 Guest are viewing this topic.

Offline Toom038

  • Jr. Member
  • **
  • Posts: 30
pressure/vacuum test?
« on: May 28, 2013, 09:08:58 AM »
Does anyone know what pressure and/or vacuum I should use to test a 500 motor? I have a '99 that I can't get jetted right. I want to eliminate all other issues before I go postal on this carb and put a new one on it. I'm at a 180 main, 52 pilot and stock needle at 4th clip from top and it still blubbers off the bottom. Floats are set at 16mm and I put a rebuild kit in the carb. Seems fat on the bottom and then hits hard at upper mid. I'm right at sea level, running 50/1 93 pump gas. Is there something else I could be missing? Thanks in advance.
« Last Edit: May 28, 2013, 09:28:59 AM by Toom038 »
Logged

Offline sandblaster

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 8,271
    • OEM-CYCLE QUALITY USED PARTS
Re: pressure/vacuum test?
« Reply #1 on: May 28, 2013, 11:44:23 AM »
Should hold 7lb positive and negative pressure overnight.
Thank Yodarad for the info :-)
Logged
The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline joko

  • Full Member
  • ***
  • Posts: 62
Re: pressure/vacuum test?
« Reply #2 on: June 30, 2013, 11:09:43 AM »
 I tried a 2" expansion plug in the exhaust port to seal it. It was a little too small by about .080", so I wrapped electrical tape around the rubber OD and put it in. It still leaked, when I checked it with soapy water, I think the grooves in the exhaust port from the pipe contributed to the leaking, but couldn't get it to seal after many attempts. Anyone have a better plug solution?
Logged

Offline Gage

  • Full Member
  • ***
  • Posts: 110
Re: pressure/vacuum test?
« Reply #3 on: July 01, 2013, 03:45:49 PM »
« Last Edit: July 01, 2013, 03:48:53 PM by Gage »
Logged

Offline sandblaster

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 8,271
    • OEM-CYCLE QUALITY USED PARTS
Re: pressure/vacuum test?
« Reply #4 on: July 01, 2013, 04:12:29 PM »
I'm wondering... Since it only has to hold 7lb have you tried some black RTV?
Logged
The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline Toom038

  • Jr. Member
  • **
  • Posts: 30
Re: pressure/vacuum test?
« Reply #5 on: July 02, 2013, 01:41:13 PM »
I found a plug in the plumbing section at my local Ace hardware store. It worked fine. No leaks. Thanks for the info here. I got her running really well now thanks to the knowledge of you guys. It was the float height that was screwing things up. Checking it externally found the issue.
Logged
Pages: [1]   Go Up
« previous next »