Applying Rocker Arm Bases, A Hint or two from Dave

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Written by Dave M   
Thursday, 10 June 2004

Reprinted by permission from Mr Tidy's tech tips

On Changing Cams
and lifter advice.

The procedure of changing cams is typically done without changing lifters, unless there was a pre existing problem with the lifters. I have seen this procedure done, and know of many others who simply received the cams and all was well. 

There are a number of reasons why your lifters bled down and produced the racket you heard. If your mechanic did any combination of things he could have easily bled them down. Which is only a temporary problem, and usually will correct itself after running the bike long enough for the oil to warm up, and circulate back through the lifters. 

In the process of installing the cams, the rockers base is removed, and the push rods are extracted, the lifters are also removed. Your mechanic should have bled the lifters before re-installing them. Putting all components back in the original position, maintains the same valve clearance, and an adjustment of the valves is not necessary. The critical part of assembling the engine to avoid lifter bleed down is bolting the rocker base back on. Because the Rocker base preloads the lifters, it is important to install each rocker base when the cylinder is at top dead center and the cam lobes are in the fully closed position. This way you are not forcing the rocker base down on lifters that are sitting on the high side of the cam. 

One final note here. The design of the hydraulic lifters is a very basic simple design. They rarely fail, and unless they have dirt in them which blocks the check valve, they are not the problem. 



Questions should be asked in our forum (Use discuss link below). The forum is very active and you stand a good chance of getting your questions answered there. If you would like to leave feedback for the author, or have additional information you think will benefit others, please use the comment section at the bottom of this page.

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DISCLAIMER: This information and procedure is provided as a courtesy and is for informational purposes only.  Neither the publishers nor the authors accept any responsibility for the accuracy, applicability, or suitability of this procedure.  You assume all risks associated with the use of this information.  NEITHER THE PUBLISHERs NOR THE AUTHORs SHALL IN ANY EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, PUNITIVE, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, OF ANY NATURE ARISING OUT OF OR IN ANY WAY CONNECTED WITH THE USE OR MISUSE OF THIS INFORMATION OR LACK OF INFORMATION.  Any type of modification or service work on your motorcycle should always be performed by a professional mechanic. If performed incorrectly, this procedure may endanger the safety of you and others on your motorcycle and possibly invalidate your manufacturer’s warranty.


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  Comments (1)
cam lifters
Written by deeko, on 03-08-2007 10:26
My bike is sick on inspection the cam lifters are so worn that they look like someone put a thumb print in them one has actualy worn through, the cam looks a bit messed up to oil line is clear and oil pump seems to be workin wo u recken caused so much wear

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