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Author Topic: I have a cam chain question...  (Read 206 times)

Offline cbrianroll

  • Posts: 162
I have a cam chain question...
« on: Jul 27, 2017, 22:49:36 »
Why does a motor need to be warm and running to adjust the cam chain? I've been battling my 79 xr500s chain adjustment while warm and in the bike. I've followed the manuals recommendations and it didn't work....4 times..i even tapped lightly. So being frustrated I pulled the motor and the head. The chain was loose so I loosened the nut and bolt, tapped lightly and it tightened. Is this gonna be bad to run the motor now? It would be great to not have to tear down the motor anymore. Thanks

Offline cxman

  • DTT SUPPORTER
  • *
  • Posts: 2317
Re: I have a cam chain question...
« Reply #1 on: Jul 28, 2017, 07:54:24 »
the motor "grows" with heat expansion

your adjuster must have been stuck
1978 CX650 Super Deluxe
1979 XS1100 Special
1980 XS650
1980 cx500  The Beast
1983 GL650 i
1983 cx650 Custom
1973 CB450
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1977  gl1000
1976 gl1000 LTD
 1983 GL1100 Nekid
and a bunch of others

Offline datadavid

  • Posts: 1120
Re: I have a cam chain question...
« Reply #2 on: Jul 28, 2017, 09:32:27 »
Yes, to exemplify: if you tighten it on a cold engine(should always be just a little slack even with hot engine) and the engine expands - the cam chain is going to destroy camshaft and crank bearings.

Offline cbrianroll

  • Posts: 162
Re: I have a cam chain question...
« Reply #3 on: Jul 28, 2017, 14:59:52 »
Dang....i figured because expansion but I was hoping lol...any thoughts why it won't adjust when running? I guess I'll pull the jug and dig in.....thank you both! I did have smidge of slack in it...
« Last Edit: Jul 28, 2017, 15:04:57 by cbrianroll »

Offline cxman

  • DTT SUPPORTER
  • *
  • Posts: 2317
Re: I have a cam chain question...
« Reply #4 on: Jul 28, 2017, 17:13:13 »
before you tear it all apart get on the net and seek out some forum expertise

some of these bikes are known to stick when adjusting them and there is s "trick to them

so you use a screwdriver to help tension them or  pin punch to push the plunger excetera

ask around and see if there is one for your bike
« Last Edit: Jul 28, 2017, 17:20:22 by cxman »
1978 CX650 Super Deluxe
1979 XS1100 Special
1980 XS650
1980 cx500  The Beast
1983 GL650 i
1983 cx650 Custom
1973 CB450
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1977  gl1000
1976 gl1000 LTD
 1983 GL1100 Nekid
and a bunch of others

Offline cbrianroll

  • Posts: 162
Re: I have a cam chain question...
« Reply #5 on: Jul 28, 2017, 18:42:35 »
Cool beans....