Reply to thread

Help Support Classic Goldwings:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Message: <blockquote data-quote="C5Performance" data-source="post: 140981" data-attributes="member: 2938">I have a few thoughts. First, the cams are supported on a layer of lubrication in the cam journals. Yes there can be journal wear, and I've seen plenty of air cooled dirt bikes/ATVs with excessive wear from lack of lubrication (over heating and/or oil that is broken down from wear). This could explain cam movement in the head (even excessive) but not rotation/wobble. Dan what I try to think of is how a cam with some play in the journals could convert an "up and down" motion of excess clearance into a "rotational" issue. Once the engine is up to operating rpm there should be enough oil fed to a journal to prevent excessive motion, or many not?? But an excess rotation of even 5 degrees would mean an incredible amount of wear. Idle with a loping engine does cause belt or cam chain wobble on cars as well, but under a load while accelerating there would be minimal variation since the timing belt is pulling like crazy always in the same direction. In my opinion this would "smooth out" any belt bounce that might be present at idle. Anyone who grew up on a farm using belt driven equipment knows this (and yes I did). SOOOOO....I must remind you that the measurement of 9 degrees of timing variation was performed at idle only. It was not measured at higher rpm (and perhaps it would get better, perhaps worse...we don't know). It is possible, and should be tested further!Timing advance parts could have caused some of this bounce. The wobble (variation) was recorded using mechanical points so locking the advance parts in place would be a great next step.</blockquote>

Verification