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Discussion Starter #3
Thanks for the information. I bought a compressions tester and it only is reading 60psi. This is the first and only time I've used it. I ride my bike everyday and haven't noticed a drop in performance. If the compression is that low (half the recommended minimum) would I notice a difference or is the gauge more likely incorrect? Thanks for any help!!
 

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just checking you had the starter cranking for several seconds with a nice full battery? most wont get full psi on first or second cycle
 

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Thanks for the information. I bought a compressions tester and it only is reading 60psi. This is the first and only time I've used it. I ride my bike everyday and haven't noticed a drop in performance. If the compression is that low (half the recommended minimum) would I notice a difference or is the gauge more likely incorrect? Thanks for any help!!


I hope I'm not teaching Granny to suck eggs here, but to get a correct reading the engine should be warm and the throttle wide open. If you have a CV carb you will have to remove it as the slide only opens when there is a vacuum in the manifold.



I hope that helps you.
 

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Discussion Starter #7
I did it with the engine cold and hot, full and closed throttle and got the same 60psi reading. My TW is a 2007 not sure if it has a CV carb or frankly what that is. Thanks.
 

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Discussion Starter #8
Oh maybe I should add that I bought the compression gauge for a truck but thought I'd test it on the TW because I thought at least it was is good running condition....
 

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I did it with the engine cold and hot, full and closed throttle and got the same 60psi reading. My TW is a 2007 not sure if it has a CV carb or frankly what that is. Thanks.


2007 has a CV (constant velocity) carb. This type of carb relies on a vacuum on the intake side of things to lift the throttle slide so when the engine is not running i.e when doing a compression test the slide does not open.



But as you say the bike runs fine then maybe your tester is not working properly.
 

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Discussion Starter #10
2007 has a CV (constant velocity) carb. This type of carb relies on a vacuum on the intake side of things to lift the throttle slide so when the engine is not running i.e when doing a compression test the slide does not open.




So would I need to detach my carb. to get an accurate reading?
 

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Discussion Starter #12
Thanks for the information. I'll probably wait then till I clean the carb to the test again since the engine runs fine.
 
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