Question about doing a compression test
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Joined: Jul 2017
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From: Salt Lake City
Question about doing a compression test
I have a compression test related question. I did a search on the Forum but can't find an answer to my question. Also, part of the question deals with incomplete information in the Service Manual (imagine that)
im going to do a compression test on my 87 FLSTC. The reason is I just want to get an indication how the top end is doing. I have always gotten a little oil out the air cleaner breather hose but just want to verify the rings are still okay. Now on to the question.
The service manual says to crank the engine over 7 times. The manual says to note the compression on the 1st and 2nd strokes but never specifies what to do with the documented compression numbers for the first two strokes. The manual only says that the finished compression for the two cylinders have to be within 10% of each other and above 90 psi.
I'm in no way a mechanic. However, I have done well over the years just using the manual or people's suggestions and doing tests and work on my bikes myself. I have found out many answers to questions about my bikes by searching for answers on this Forum. That's why I finally signed up. So if anybody can educate me what to do with the compression values on stroke 1 and 2 I'd appreciate any help or advice.
Greg M
im going to do a compression test on my 87 FLSTC. The reason is I just want to get an indication how the top end is doing. I have always gotten a little oil out the air cleaner breather hose but just want to verify the rings are still okay. Now on to the question.
The service manual says to crank the engine over 7 times. The manual says to note the compression on the 1st and 2nd strokes but never specifies what to do with the documented compression numbers for the first two strokes. The manual only says that the finished compression for the two cylinders have to be within 10% of each other and above 90 psi.
I'm in no way a mechanic. However, I have done well over the years just using the manual or people's suggestions and doing tests and work on my bikes myself. I have found out many answers to questions about my bikes by searching for answers on this Forum. That's why I finally signed up. So if anybody can educate me what to do with the compression values on stroke 1 and 2 I'd appreciate any help or advice.
Greg M
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Intermediate
Joined: Jul 2017
Posts: 30
Likes: 4
From: Salt Lake City
Thanks Scott. Good idea about keeping charging in place. My guess is so you get constant cranking speed without any variability between cylinders. After I do the test this weekend and if I end up with poor results, I'll revisit the thread.
Greg M
Greg M
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