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Cam Sprokets

  • Thread starter Thread starter Boozy Creek Beast
  • Start date Start date
B

Boozy Creek Beast

Guest
I want to replace my cam sprokets with new adjustable ones. Anyone have a layout for the procedure.

The Beast
 
Man, what are you talking about? I must be missing something here...what are adjustable cam sprockets?
 
Adjustable Cam Sprokets

Adjustable Cam Sprokets

First, What bike are we talking about? Remove the valve cover. Next step is to place #1 at T.D.C. If you have a manual, it will show the markings on the cams and how to allign them so that you are at T.D.C. Next, slack off the cam chain. Remove the cam caps. Tie the cam chain up with some string or wire. Remove the cams and old sprockets. Replace the old sprockets with the new ones. Place cams/new sprokets back into place, ensuring that you have the correct allignment and have not got things out of place with regards to the cam chain. Degree the cams. Set the correct valve lash. Replace valve cover. Now...this is a very simplified version of how to approximately do the job. You need a manual and some tools. I did my 1100ESD last spring, and it was not too difficult. You just can't be out with the initial timing,( incorrect position of the cams). email me if you still want to do the job, and I can give you some additional help.

Craig
 
If your sprockets are still in good shape, just take them to a machine shop and have the bolt holes slotted. It is a pretty simple procedure for a shop that has the right equiptment. By slotting the holes you allow the cams to be moved inside the sprockets. This allows you to adjust cam timing to a specific value via a degree wheel.

Photo is from Jewel Hendricks 1988 "Superbike Preperation" an excellent book I highly recommend. It deals with 1980"s era bikes with heavy emphasis on the air/oil GSXR's. Good Luck, Ed
1983 GS750ED
 
The sprockets have a slot in them where they mount to the camshaft. Its much like the breaker plate slot on the ignition. It allows you to precisely time the cams minute amounts.

Earl


jimcor said:
Man, what are you talking about? I must be missing something here...what are adjustable cam sprockets?
Click to expand...
 
Well live and learn. Didn't know about this. But this would seem to me to be an icing on the cake modification. Before I started fooling around with valve timing I'd want an engine with everything else dialed in pefectly.

And of course on a non-competition engine...why bother?
 
Well live and learn. Didn't know about this. But this would seem to me to be an icing on the cake modification. Before I started fooling around with valve timing I'd want an engine with everything else dialed in pefectly.

And of course on a non-competition engine...why bother?
Click to expand...

It is worth the bother because the stock timing can be all over the map. Many people have gained 8-10% on rwhp simply be degreeing their cams properly. For the cost of a pair of sprockets, that is very cheap power. Another benefit is that you can tailor the torque curve to your requirements by degreeing the cams. Lower lobe center numbers (104-106 degrees) make more bottom end and mid range power, while higher numbers (108-110 degrees) make more top-end power.

This is one of the first mods I plan to do on my 1100, along with pod filters. For a few dollars and some time in the garage, I expect to see another 10-15 rwhp, hardly worth sneezing at.

Mark
 
All of this info. is great but dose anyone have the procedure down that dosen't mind sharing it. Is it a procedure that most normal shops could handle or do I have to go to a specialist.
 
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