I guess I stirred something up. I did check parts sites and found no new parts
available. (that puzzles me, I never used any) They don't wear out and you can
purge them. There is a tool for purging the air that you don't need, just makes
it easier. Let's start here; do they (one or more) tap all the time, some of
the time, once in awhile ? For the always and often cases, you may have to
remove and purge. For the once in awhile, CHANGE OIL... then change it again.
Get the nasties out. The 3K RPM deal is to force out the particle. In practice,
consider the adjuster like an oil pressure gauge. It's a dead-end that reacts
to pressure. They do leak some out of the bore and back into circulation. I
change my oil every thousand miles. Comes out like it went in. Seems a shame
but the alternative would be more so. My one 700s started to tap on a trip and
without any option, I continued to ride it home. It stopped some miles later
and I changed the oil next day.
Never heard from again. Any top-end work and I remove them and place
right-side up till I reinstall. Somebody once tipped over a few and I had to
purge them before replacing in motor. If the problem persists and needs
attention, the offending ones are easy to identify. To save time, use a
screwdriver as a stethoscope and get a good idea of it's general location.
There should be no clearance at any valve. Since they retain oil, the ones that
are really hard to push down are good. Without oil, you are pushing against a
spring only. (still, a tough one) Now removing it is a chore. As I am want to
do, I recommend to degree in the cams on any bike with high mileage if you have
any reason to remove them. The results are well worth it. Bleeding the air out
of an adjuster is a simple process where you insert an object into the hole in
the end and while holding it under in a bowl of oil, work the piston till the
bubbles stop coming out. Hold upright and install.
I once got a Hawk in that had been laying on it's side for a long time... uh
oh. It started and rapped like mad for about 3~4 minutes. Once it quieted down,
we changed oil and filter, sent it on it's way. You have to make the call as to
what you want to do / can do for your problem. Everybody has thier own snake
oil, I'm going to recommend Marvel Mystery Oil added to whatever you use. It's
quite good at cleaning. One pint in my '86 700s does it for me. (that year has
the largest sump) It is possible one could fail, they are after all a
mechanical device. That one would feel "not right" when purging. As in sticky,
not smooth.Or a broken spring inside.
Any of this rambling help ?
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