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xs650 > > Motorcycle Systems > > Engine > > Cam Chain and Valve spring Help |
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Cam Chain and Valve spring Help
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cscarroll Full Member
Joined: Oct 08, 2006 Posts: 112
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Posted: February 26, 2008, 3:43 pm Post subject: Cam Chain and Valve spring Help |
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Fellas,
About ready to build my '74 motor back up. Wanted to check a couple things.
I saw on mikesXS he sells a new front cam chain guide bar. Do I need to replace the rear portion as well? Mine show very little wear, I'm just worried with the plastic being so old, things might get brittle.
Also, I measured my valve springs (inners and outers) and they are bit undersized from what the shop manual lists for a height (.5 mm or less). Does anyone have an idea as to what the limit is before they should be replaced? My factory shop manual doesn't list a wear limit for these.
Thanks in advance. Pics to come once things get moving. Pretty excited to see this motor run as I've punched it out to 680cc.
-C
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Finksies Full Member
Joined: Jan 26, 2008 Posts: 178 Location: Windham, NH
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Posted: February 26, 2008, 5:16 pm Post subject: Re: Cam Chain and Valve spring Help |
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I just replace the front guide bar aswells, and left the tensioner since it looked fine. Make sure to replace the valve seals, cheap insurance. Not sure about the springs. I just put mine back in. There is a top and bottom to the springs if u didnt know, cause i didnt and had to take the springs back apart. Good luck.
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cscarroll Full Member
Joined: Oct 08, 2006 Posts: 112
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Posted: February 26, 2008, 6:05 pm Post subject: Re: Cam Chain and Valve spring Help |
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Fink.
Thanks for the 2 cents. I do have new valve seals so should be good there.
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grizld1 Full Member
Joined: Jun 20, 2005 Posts: 594 Location: Carbondale, IL
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Posted: February 26, 2008, 7:56 pm Post subject: Re: Cam Chain and Valve spring Help |
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The factory manual specifies 2 mm. short of original length as the service limit. Your springs are fine.
_________________ It ain't whatcha got, it's whatcha can get to the ground! |
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cscarroll Full Member
Joined: Oct 08, 2006 Posts: 112
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Posted: February 26, 2008, 11:31 pm Post subject: Re: Cam Chain and Valve spring Help |
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Griz,
That's what had me confused. My manual did not list the 2 mm short as the service limit.
Wish those engineers could make up their mind...
Thanks.
-C
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Amateurs built the Ark, Professionals built the Titanic! |
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grizld1 Full Member
Joined: Jun 20, 2005 Posts: 594 Location: Carbondale, IL
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Posted: February 27, 2008, 3:04 am Post subject: Re: Cam Chain and Valve spring Help |
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'78 edition, Engine section, p. 24 (all the 447 valves gear's the same). The tech writers are probably more to blame than the engineers--maybe enough guys yelled about that omission to get it corrected in later manuals!
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