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11-17-2011, 02:47 PM
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#1 (permalink) |
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:::Rookie Rider:::
Join Date: Nov 2011
Posts: 8
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Lt500 compression question?
Hey guys, some of you may have seen that I picked up a nice zilla the other day. The previous owner said that it lost compression, but once I got it home I screwed in the spark plug, and it seemed to have decent compression. I took it to Trinity racing today and they said that the compression is only 100. Is this low for this bike? Should I not try and ride it before I open up the top end and see whats going on in there? Thanks!
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11-17-2011, 03:16 PM
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#2 (permalink) |
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:::Mini LT50 Rider:::
Join Date: Nov 2011
Location: New Castle Delaware
Posts: 78
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That is real low. Top for a top end build. Make sure you do a leak down test and jet it correctly after you get the top end done. The Zilla has alot of power to gain with the right upgrades
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11-17-2011, 04:45 PM
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#5 (permalink) |
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:::LT500 Rider:::
Join Date: Jan 2010
Location: North Carolina
Posts: 1,235
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Are you able to test the compression yourself? If so drop a slight bit of 2-stroke oil down the spark plug hole and gently kick it over a few times(with no spark plug). Then check compression agian, this is called a "wet compression test". If the number exceeds 100psi with the wet test thats an indication that your rings are shot. And doing rings in a 2-stroke is insanely easy! and realtivly cheap.
__________________
04 LTZ 445 95mm CP 12.78:1************** Elka stage3 front & rear Web 540-539***************** JRD +3 LT A-arms 42mm Kehin******************* Burguard +1.75 swingarm Full HMF shorty *************** Hiper tech3's in Kenda klaws Dyna programable*********** Lonestar axle, carrier & stem |
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11-17-2011, 04:58 PM
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#6 (permalink) |
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:::Mini LT50 Rider:::
Join Date: Nov 2011
Location: New Castle Delaware
Posts: 78
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If your going to compression test it yourself, make sure to hold the throttle wide open and kick it till the gauge needle stops rising . Your best bet is to have a shop look at the cylinder to determine if it needs a bore or just a hone.
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11-17-2011, 06:44 PM
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#7 (permalink) |
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:::Rookie Rider:::
Join Date: Nov 2011
Posts: 8
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Yeah I took it to Trinity racing to get the compression tested. I thought the were a very reputable shop. I watched when they did the test. They didn't do a wet test. and he didn't touch the throttle at all. Could this have given me a false test? He screwed his compression tester in, and kicked it a few times and said it was at around 100
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11-17-2011, 06:52 PM
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#8 (permalink) |
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:::Post Whore:::
 
Join Date: Aug 2007
Location: Connecticut
Posts: 2,685
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if the throttle is closed, the intake tract is under vacuum, so the cylinder will not completely fill with air, and there is much less air to compress which gives you a lower number. always compression test wide open.
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11-17-2011, 06:53 PM
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#9 (permalink) |
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:::Mini LT50 Rider:::
Join Date: Nov 2011
Location: New Castle Delaware
Posts: 78
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That don't sound like the right way. I've done many on mine and it takes about 8-9 kicks for it to read it's highest. Having the throttle open let's it draw in the air alot easyer to compress it . Try it my way and post the reading.
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