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I checked my cranking compression on my 05 900(warm engine). It seemed low at 125 psi on each cylinder. What are others seeing for compression? When I put my HTG pipe on I looked up the cylinders and they look good. 1000 miles on the sled.
 

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yah nine was around 130 too
 

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Originally posted by larrypolaris@Aug 24 2005, 12:09 PM
I checked my cranking compression on my 05 900(warm engine).  It seemed low at 125 psi on each cylinder.  What are others seeing for compression?  When I put my HTG pipe on I looked up the cylinders and they look good.  1000 miles on the sled.
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how much did the pipe cost ya they told me 750 thought that was kinda expensive.
 

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Originally posted by larrypolaris@Aug 24 2005, 04:55 PM
Mine was around $700.00.  Pipe, manifold, and can.  Ceramic coated.  Looks and sounds sweet.  No reflash required.
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what kind of gains are we talking?
 

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i beleive it is around ten hp isnt it.
 

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i wouldnt see why it wouldnt be reliable pipes u put on most other sleds are pretty reliable.
 

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Originally posted by larrypolaris@Aug 24 2005, 03:55 PM
Mine was around $700.00.  Pipe, manifold, and can.  Ceramic coated.  Looks and sounds sweet.  No reflash required.
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any pics of pipe and can?
 

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Originally posted by larrypolaris@Aug 24 2005, 12:09 PM
I checked my cranking compression on my 05 900(warm engine).  It seemed low at 125 psi on each cylinder.  What are others seeing for compression?  When I put my HTG pipe on I looked up the cylinders and they look good.  1000 miles on the sled.
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What did that gauge read on your 700? My gauge reads a little low at 125 on my edge 700. The important thing is that they are both reading the same. The Fusion is probably more like 135(I don't know for sure) on a dead on balls accurate gauge but a $50.00 one can be out by 10 either way. JMHO.
 

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Discussion Starter · #14 ·
My 700 Edge was 145 each cylinder. My 00 800 xcr read 130 each cylinder. A buddy of mine just had his 04 ZR900 done to a 1000. We were testing on the grass last week and after testing I checked his cylinders and his were 145 each.
I have a off the shelf Auto Zone guage with the check valve at the base where it screws into the cylinder. I heard someplace that the Fusions will read low because of the decompression port. Once the engine starts the decompression port is covered by the exhaust valves.
 

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Originally posted by larrypolaris@Aug 29 2005, 06:23 PM
My 700 Edge was 145 each cylinder.  My 00 800 xcr read 130 each cylinder.  A buddy of mine just had his 04 ZR900 done to a 1000.  We were testing on the grass last week and after testing I checked his cylinders and his were 145 each.
I have a off the shelf Auto Zone guage with the check valve at the base where it screws into the cylinder.  I heard someplace that the Fusions will read low because of the decompression port.  Once the engine starts the decompression port is covered by the exhaust valves.
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Shouldn't matter with the decompression hole, if you have a 700 Edge it's an '02 or newer and I regularly got readings of 140 to 145 on my '02 700. Further, since it's an '02 or newer, it has a decompression hole... I never did a compression check on my 900, but it wouldn't matter if it had 50lbs or 250lbs of compression when comparing performance to different displacement engines.

Compression test is an "indication" of motor soundness by checking to see if all cylinders are within a tolerance using the "same guage." If you want to know more about an engine aside from tearing it down and checking tolerances with a micrometer, you need to do a leak-down test.
 
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