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Author Topic: CB550 Normal Compression  (Read 1597 times)

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Offline phillip56

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CB550 Normal Compression
« on: June 23, 2011, 05:21:15 PM »
I'm just curious if anyone knows what the normal compression is for CB550. Mine seems to have some problems and I'm only getting 90-125 PSI for compression.
Thanks for the help
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bollingball

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Re: CB550 Normal Compression
« Reply #1 on: June 23, 2011, 05:30:09 PM »
As long as they are close to each other (10%) I think. Don't worry. What is the lowest and highest reading? Was the engine cold or operating temp? was the throttle and choke wide open?

              Ken
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Offline TwoTired

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Re: CB550 Normal Compression
« Reply #2 on: June 23, 2011, 05:31:35 PM »
See the engine FAQ.
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

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Offline dave500

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Re: CB550 Normal Compression
« Reply #3 on: June 23, 2011, 11:07:10 PM »
is the engine smokey?does it fume from the breather pipe?90-125 is getting a bit low i think,ill wager broken rings if its fumey.,what other problems does it have?
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Offline bryanj

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Re: CB550 Normal Compression
« Reply #4 on: June 24, 2011, 12:01:35 AM »
Thats too widw a range and 90 is too low
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

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Offline TwoTired

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Re: CB550 Normal Compression
« Reply #5 on: June 24, 2011, 12:52:51 AM »
Has the engine been sitting unused for a while?
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.
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