Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)
HELP w assembly
81cr450:
Flat .000 using the .020 kawasaki base gasket
Didnt get a chance to get the dome cc today had to pull 2 cr500 motors after work. Ughhh I'm getting old
81cr450:
Called Pinsonnault today 12.5:1 & 7.5:1 93-100 octane
Good call GREENKAW24
A stock motor is 7.4:1 so it should be okay, was also said. He couldnt give me the dome cc though?
I think I'm just gonna do the 50/50 pump / avgas mix . Best just to have it run right , might get rode a little less though.
Just did some reading on avgas & found a good article
http://www.klemmvintage.com/gasolines.htm
Motorrad:
How can they tell you all that and not tell you the head CC?
I have been bit by head CC before...
wanted 40CC.. ran bike, was down on power from where I thoguht it should be.. ended up being at 46cc..
Yea.. thats only like.. A TON OF COMPRESSION POINTS differance...
when you get up in the Big bore motors.. it really matters..
40cc to 42cc is the differance between 15:1 and 13:1 (once again going off my bad memory here)
GREENKAW24:
81CR450,
I am the one you called. You gave me a cc number of 47cc, I figured you meant the net cc when the top end is assembled? In that case it would be the 12.6 to 1/7.4 to 1 ratios, if the 47cc was just in the head, I would have needed to know your deck height, gasket thickness, and step depth to find your net cc from the 47, and your compression ratios would be different.
GREENKAW24:
--- Quote from: Motorrad on January 05, 2012, 03:09:57 AM ---How can they tell you all that and not tell you the head CC?
I have been bit by head CC before...
wanted 40CC.. ran bike, was down on power from where I thoguht it should be.. ended up being at 46cc..
Yea.. thats only like.. A TON OF COMPRESSION POINTS differance...
when you get up in the Big bore motors.. it really matters..
40cc to 42cc is the differance between 15:1 and 13:1 (once again going off my bad memory here)
--- End quote ---
40cc would be 13.5 to 1, and 42cc would be 12.9 to 1. (Stock KX500) Compression ratios don't change as drastic for every cc when you get to the big motors.
2cc difference on a 125 can change 2 whole points.
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