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660 Compression

This is a discussion on 660 Compression within the Grizzly Engine & Transmission forums, part of the Grizzly Forums category; Hi i am new to the site as well as the grizzly. I just purchased an 02 660. I am going through all of the ...


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#1
02-19-2010, 09:36 PM
660 Compression

Hi i am new to the site as well as the grizzly. I just purchased an 02 660. I am going through all of the normal engine maintenance. I have ordered the manual but have a hard time waiting for things. I did a compression test tonight and found what i think is rather low. 90psi. Does anyone know what the 660 should get new? Also if anyone has any sugestions on things that need looked after more than other machines please let me know.
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#2
02-19-2010, 10:39 PM
That is very low. I'm not sure but I think it should be around 150.
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#3
02-20-2010, 07:10 AM
thats ok there is a auto compression release built into the cam. the 700 is only around 60 psi. I have a 660 manual I will look and see. post back later.
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#4
02-21-2010, 12:24 AM
Thanks, i talked to one of the service guys at yamaha today and he said he thought it was around 100. I know it is not 150. if it was that hi you would need a lot higher of an octane rating than you can buy at the pump.
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#5
02-21-2010, 09:33 AM
I stand corrected the 660 standard is 188.31 psi, minimum is 163.57 psi and maximum is 210.5 psi.

on a 700 it`s minimum 55.8 psi,standard is 64 psi and maximum is 71.7 psi

I got this info from the Yamaha Service manuals. I thought the 660 specs were a typo but I have 2 different manuals and both state the same thing.
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#6
02-21-2010, 10:17 AM
Mike has got it right, I just verified it with my service manual.
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#7
02-22-2010, 08:15 PM
Wonder why there is a huge difference between the 660 and the 700...?
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