Help with installing camshaft


5 replies to this topic
  • Buenodude

Posted July 17, 2005 - 01:24 PM

#1

I just had my head redone by XR's only and am putting my bike back together. I seem to be having a difficult time with the camshaft. I've got the cylinder at TDC - now what? The Clymers manual isn't a darn at this point. Looks to me like the timing chain sproket can go on the cam either way - it doesn't appear to be offset - so - if I install the cam with the lobes down can I just bolt the sprocket on or is it marked to go on a particular way. Should the marks (-) on the sproket be pointing vertical or horizontal at TDC? Also - before I put the cam in - the chain freewheels on the timing gear easily. When the cam is in it seems to be binding - is it suppose to be easy to turn? chain also seems tight - like i don't even need a tensioner. Any help with this would appreciated.

Thanks - buenodude

  • bootlegger2

Posted July 19, 2005 - 01:37 AM

#2

the lines are vertical on the sprocket. is it a new chain you are putting in? the line match up perfect with the head with a new and dont with a old one i have seen before from being stretch a little.

  • Motosprtman

Posted July 19, 2005 - 05:35 AM

#3

be CERTAIN of the cam sprocket alignment marks in reassembly - get it wrong and you will bend valves. I do rebuilds on the old HOnda XL motors all the time and the cam sprocket marks are _____ 0 _______ horizontal (flush)with the head, cam lobes down, piston at TDC (or "T" mark on the flywheel) when all is positioned correctly. I just did a 1975 XL350 motor where someone at some time got it wrong and both exhaust valves were bent. I would think that not much has changed and cam timing is the same on Big Red as it is on the old boys...

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  • Buenodude

Posted July 19, 2005 - 09:26 AM

#4

Thanks for the help

  • Buenodude

Posted July 19, 2005 - 09:29 AM

#5

Thanks for the help - I appreciate it. I got it in and everything seems OK. Now that its done I need to adjust the valves - .04 on the intake and .05 on the exhuast. How do you identify the exhuasts - are they at the front of the head where the exhaust comes out?

  • Motosprtman

Posted July 19, 2005 - 11:00 AM

#6

Yes, they are the ones in front. leave the piston at TDC when adjusting the valves.





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