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Title: How much compression should it have ? Post by: debatethis on February 11, 2006, 08:35:09 PM What kind of compression should a Honda CRF 450 motor have in it ?
Thanks Title: Re: How much compression should it have ? Post by: TurboBanshee_kid on February 11, 2006, 08:37:17 PM Call honda. www.honda.com
Title: Re: How much compression should it have ? Post by: o4250 on February 11, 2006, 08:53:30 PM A lot.
Title: Re: How much compression should it have ? Post by: 2006YFZ450 on February 12, 2006, 07:48:38 AM It should have......12.0:1 ;)
Title: Re: How much compression should it have ? Post by: ppark350se on February 12, 2006, 08:19:16 PM It should have......12.0:1 ;) hey there smartie pants thats the compression ratio. not the compression he wll see on a compression test. it would be in psi. i would firgure around 120psi but thats just my guess. Title: Re: How much compression should it have ? Post by: greenmachine on February 14, 2006, 09:25:41 PM 120-130 is pretty good.
Title: Re: How much compression should it have ? Post by: Chuck_Norris on February 17, 2006, 11:48:31 AM It should have......12.0:1 ;) hey there smartie pants thats the compression ratio. not the compression he wll see on a compression test. it would be in psi. i would firgure around 120psi but thats just my guess. Title: Re: How much compression should it have ? Post by: Toomey on February 19, 2006, 07:30:01 PM It should have......12.0:1 ;) hey there smartie pants thats the compression ratio. not the compression he wll see on a compression test. it would be in psi. i would firgure around 120psi but thats just my guess. I don't know about that. That'll work when it's new, but after it wears and the compression goes down, that won't really work anymore. The ratio will always be the same. That's the volume of the cylinder and head when the piston is at BDC, compared to the volume when it's at TDC. How much compression a motor has changes as it wears or gets rebuilt. Go to www.thumpertalk.com though for an answer. 120 seems low to me? 2 stroke MX bikes will see 200 often. I'm not sure if 4 strokes just don't need that kinda compression to run awesome. Title: Re: How much compression should it have ? Post by: debatethis on February 20, 2006, 10:41:41 AM That puts it at 12, Thanks Chuck
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