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Need advise on compression readings


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Hello everyone, I just purchased my first Banshee, (2005 Red/White). Everything is stock except T-5's pipes. The engine has never been opened. Today I did a compression test and the results were 105psi per cylinder. I used a cheap "Harbor Freight" Compression tester gauge to do the test. The test was done holding WOT & with the engine at ambient temp, kicked over 10-15 times & both sparkplugs removed. The bike will start within 3-4 kicks every time. My borther has the same bike and his engine compression is 120psi per cylinder. His bike has VForce3 reeds and T-5 pipes as well. I guess what I'm asking is How good or bad the compression on my engine really is? Will after market reeds make a difference? Should I rebuild? Thanks!!!

 

Link for the gauge: http://www.harborfreight.com/flex-drive-compression-tester-92697.html

 

100_2292.jpg

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Hello everyone, I just purchased my first Banshee, (2005 Red/White). Everything is stock except T-5's pipes. The engine has never been opened. Today I did a compression test and the results were 105psi per cylinder. I used a cheap "Harbor Freight" Compression tester gauge to do the test. The test was done holding WOT & with the engine at ambient temp, kicked over 10-15 times & both sparkplugs removed. The bike will start within 3-4 kicks every time. My borther has the same bike and his engine compression is 120psi per cylinder. His bike has VForce3 reeds and T-5 pipes as well. I guess what I'm asking is How good or bad the compression on my engine really is? Will after market reeds make a difference? Should I rebuild? Thanks!!!

 

Link for the gauge: http://www.harborfreight.com/flex-drive-compression-tester-92697.html

 

100_2292.jpg

 

I found this compression chart (NOSS) that, if accurate, the compression of my enigne is not that far off from what it should be at, considering that the elevation were I leave is 2360 feet.

 

According to the chart,@ 2000' compression=118psi on stock motor. Mine @2360'= 105psi.

 

Chart Link: http://www.nossmachine.com/banshee_heads.htm

Edited by traxx2003
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I found this compression chart (NOSS) that, if accurate, the compression of my enigne is not that far off from what it should be at, considering that the elevation were I leave is 2360 feet.

 

According to the chart,@ 2000' compression=118psi on stock motor. Mine @2360'= 105psi.

 

Chart Link: http://www.nossmachine.com/banshee_heads.htm

105 isnt bad for you elavation its getting there tho just toss some new rings in it.

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