Question about 2000 Harley Davidson XL 1200 C Sportster Custom

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How much cylinder compression should my XL 1200 C run?

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120 psi.+- 10% Do both a "wet" and a "dry" test.

Good Luck
Steve

Posted on Sep 06, 2010

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Covert1052cc to h.p.


Size does not convert to h.p. You need RPM, compression ratio, efficiency, crank shaft length, number of cylinders and efficiency, valve spring force constant, valve weight, and many other variables. Horsepower is normally measured with a dynomometer (dyno). It is not calculated.

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Changing spark plugs will not affect compression unless you put in the wrong reach plug and it hit and damaged a piston. Sounds more like stuck valves, bent pushrods, broken rockers, or cam drive problems.

May 27, 2014 | 2002 Harley Davidson XL 1200 C Sportster...

1 Answer

HOW MUCH CYLINDER COMPRESSION SHOULD MY XL HRLEY DAVIDSON RUN


Depending on the age/mileage and how it is/has been driven I would say anywhere from about 100 to 140 PSI. The big thing is not a great difference between the two cylinders. Anything lower and there is wear etc. and anything higher and the engine carboned up.

May 07, 2014 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

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Hi Anonymous, check compression and do a leakdown test could have bent valve, also check all pin connections at ignition module. Please visit website below for more suspects:
Harley Davidson Sportster error codes and how to access them
Good luck

Feb 16, 2014 | 2002 Harley Davidson XL 1200 S Sportster...

1 Answer

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Are you sure... check the exhause temp on the pipe, it should be cold coming out of the head.. Then run compression test and both cylinders should be within 5 lbs of each other.

Apr 07, 2013 | 2005 Harley Davidson XL 1200 C Sportster...

1 Answer

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Hi Mbcchops, you need to do a compression test on both cylinders. Good luck and have nice day.

Feb 13, 2012 | 2006 Harley Davidson XL 1200 L Sporster...

1 Answer

My front cylinder is not firing. I replaced plugs


hi you must check compression first should be same as other cyl. if not check for tight tappet if ok is the plug sparking if you hold it against cyl and turn over motor if good spark put it back and turn over motor few times then remove it and see if its wet with fuel if its not could be carby blocked jet

May 25, 2010 | 2004 Harley Davidson XL 1200 C Sportster...

1 Answer

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Have you done a compression test on all cylinders? My guess is you have a dead cylinder (no oil to one or more cylinders causing loss of power). If the compression test passes (all cylinders equal and higher than 100-110 psi) you have a restricted exhaust from a failed catalytic converter that has broken apart.

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1 Answer

I have 1200 bandit with fuel getting into oil


Check the Compression in all 4 cylinders, if the compression is low on one cylinder, squirt some oil or or WD40 down the bore and immediately recheck the compression. If the pressure goes up a fair bit you have a broken ring, if not you could have a burnt valve. If your getting fuel in the oil it definately sounds like a ring problem

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1 Answer

ONLY FIRES ON ONE CYLINDER WHEN COLD


Have you done a compression test on it. Try that. It also could be a valve, electrical or fuel problem.

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