2003 vtx 1800c motor problems

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jhbstyx · #1 Unread post by **jhbstyx** » Wed May 30, 2007 6:08 pm

I own a vtx i love but i think i messed it up. I punched out the exhaust pipe with a rebar to make it a little louder stupid me. Now the back cylinder does not fire. I put new plugs in. It has 12,000 miles. I have no spark at the back cylinder but it seems to get warm. I took a compression test on my own.i read 10 psi in the back and30 psi in fronk am i doomed?

BuzZz · #2 Unread post by **BuzZz** » Wed May 30, 2007 6:30 pm

10 and 30 psi compression?

If those numbers are right (meaning the tester wasn't leaking) something major is wrong with your engine. Since it runs at all, I suspect your numbers are not accurate.

Punching the muffler out should not have caused this.

I would re-test the compression (you want well over 100 psi, probably 150-160 for your motor) and if thats good, check your spark and your fuel delivery.

Sev · #3 Unread post by **Sev** » Thu May 31, 2007 2:41 am

Can you describe the method you used to test the compression?

jonnythan · #4 Unread post by **jonnythan** » Thu May 31, 2007 2:51 am

10 bar would be about right, as that's 145 psi.

But 30?

Sev · #5 Unread post by **Sev** » Thu May 31, 2007 2:56 am

Should be closer to 120psi or 130psi...