cmyyard19 Posted November 29, 2003 Report Share Posted November 29, 2003 I'm checking my compression, and I guess I have an air leak because it goes up to 30 then back down to zero. Would having my carbs on or off make a difference? Quote Link to comment Share on other sites More sharing options...
PassionRE Posted November 30, 2003 Report Share Posted November 30, 2003 Your gauge is acting up, you an ck the compression without carbs ....Jim Quote Link to comment Share on other sites More sharing options...
Aussie Quad Racer Posted November 30, 2003 Report Share Posted November 30, 2003 Yes, use one with a flexible hose. Quote Link to comment Share on other sites More sharing options...
boonman Posted December 1, 2003 Report Share Posted December 1, 2003 I use a KEM professional series compression guage. I can get it in there, with the included adapter with the tank still on. Now, if you believe you have an air leak, than you need to do a leakdown test. This requires a vacuum pump, and some other accessories. Search the forum, and you will find a thread or two on this that explains this in detail.... And your compression guage should hold the highest reading. If it doesn't, it is a POS and you need to get a good one... Quote Link to comment Share on other sites More sharing options...
fixitrod Posted December 1, 2003 Report Share Posted December 1, 2003 Some compression guaged have a thing that looks like a tire vavle needle that goes inside the tire vavle steem. They do go bad and even stick giving you a lower reading. If you have the sunpro version, they will usually send you a new valve to thread in there for free if you just call them. It's leaking or the 30psi would stay on there. Quote Link to comment Share on other sites More sharing options...
cmyyard19 Posted December 6, 2003 Author Report Share Posted December 6, 2003 I went out and bought a new one, this one worked perfect. showed my compression at 150. Quote Link to comment Share on other sites More sharing options...
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