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Four - Valve Noise Fix

Quick Throttle - Number 24 - March 1999
Measuring rocker arm end play.jpg (116076 bytes) Removing shaft set screw.jpg (118460 bytes)
Measuring rocker arm end play.
Removing the shaft set screw.
Removing original rocker shaft.jpg (117477 bytes) Removing rocker arm.jpg (120785 bytes)
Removing original rocker shaft.
Removing rocker arm.

     4 valve cylinders, heads, and accompanying parts have been around for some time now. The most popular and well known are those designed by Jim Feuling and marketed by Rivera Engineering.

     I have the eighth set made by Feuling, and have run them since 1990 As a matter of fact, I did an article on them for Easyriders magazine at that time.

     I like these heads. There has been a fair amount of controversy over them folks love them or hate them. Those who hate them usually do so because they never really learned how to set them up or haven't gotten them working to their satisfaction. The only advice I have for them is to read the instructions or call some-one who knows what they're doing and ask them questions.

     I have never heard anyone say they were not impressed by the power they got by simply bolting a set of these on. Of course, when you use combinations of stroke, bore, cams and carburetion, they really make a believer out of you.

     The most common complaint about these heads seems to be valve train noise. This is easily taken care of by proper set up and one of the items usually overlooked.

     For most street engines I recommend a camshaft slightly milder than what you would normally use in the same engine displace­ment, using two valves per cylinder heads. The four valve heads flow better and also seem to prefer this setup. But again, cams are different as night and day and are as much a rider preference as a seat or handlebars.

     Most of the time I recommend JIMS hydraulic lifters, but no matter what brand you choose, they must be properly fitted to the lifter housings. For my own personal engines, I make a set of non-adjustable push rods using material from White Brothers. This means setting up the rocker boxes and using a set of adjustable pushrods, adjusting them to the proper length, and then removing them without changing the length, measuring the length, and making a set like them.

     It is time-consuming, but I am more than happy with the results and have not had any failures. It should be noted that the 0-rings used to seal the rocker boxes to the head do not have to be changed, provided the engine has not been started.

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