Benefit of EZ Clutch, It Works Fine

[Tom Cutter]

Todd-

The reason that the EZ Clutch works well on Karl's R90S is that I knew that
he was planning to use it when I rebuilt that engine and gearbox. The
reason that makes a difference has not been discussed at all.

Hedz-

Crisp clutch engagement on a dry single-plate clutch requires very precise
control of several factors. Two that are not so obvious are the crankshaft
and transmission input shaft end float or "play." Disassembly of the
gearbox and engine are required to accurately set shaft end float. Just
swapping shims is NOT the answer, in fact that can cause engine seizure or
gearbox bearing failure.

BMW and GETRAG have not been so consistent in setting end float, and the
float changes with accumulated mileage-related wear. Those of us who have
ridden a lot of different Airheads will know that every bike has a slightly
different clutch engagement feel. The reason for that difference is the
too-wide range of tolerances that BMW and GETRAG allowed to pass assembly
inspection.

This relates to the EZ Clutch kit because the kit reduces disengagement
travel by half, so that can combine with too-much end float on the crank
AND input shaft to make a full clutch disengagement impossible, resulting
in slight clutch drag even with the hand lever fully pulled. That drag will
result in stiff, recalcitrant shifting, accelerated clutch disc wear, and
possible throwout bearing failure. Clutch cable play adjustment becomes
VERY critical to avoid these issues.

Just chucking an accessory on the bike without truly understanding how it
works and what the contraindications might be can end with a spoiled
vacation or costly repair bill.

When somebody makes a recommendation, and repeatedly makes an Appeal To
Authority argument by name dropping, beware. Do your research and pay close
attention. This list and other Internet sources are fountains of
information without a filter. Remember that wrong information looks just
like accurate advice when presented in Arial 10-point font. One day, we
will have AI available to sort information based on the accuracy and
veracity. Then, the foolish stuff will be presented in a Spastic Crayon
Scribble font and the accurate stuff will be in a Fancy Times New Roman
type font.  ;)

Everybody have a great August 19th!

--
Tom Cutter
Yardley, PA
www.RubberChickenRacingGarage.com

"The true meaning of life is to plant trees, under whose shade you do not
expect to sit." --Deepak Panwar




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On Mon, Aug 17, 2020 at 9:24 PM Todd Trumbore via PAAirheads <
paairheads at casano.com> wrote:

> Karl Duffner had his EZ Clutch conversion on his R90S for over 300,000
> miles without any problems.  I’m the present owner and never had a problem
> in the last 10 years. Shifts are smooth as silk... Can’t argue with
> success.  Enough said.
>
> Todd Trumbore
>
>
> On Mon, Aug 17, 2020 at 1:10 PM Ducdude <ducdude at verizon.net> wrote:
>
>> You logic is not quite sound Mac,
>>
>> Reduced effort means reduced throw at the thrust bearing means you do not
>> have the optimal disengagement of the clutch with this toy.  The Distance
>> the leaver moves does not change but the throw at the other end does that
>> is why it is easier.
>>
>> You may want to pack a spare clutch and gear box  and cable  as you could
>> be putting the reminder of the system at risk by not having it properly set
>> up.   More so in the /5 and up then the /2 it seems.
>>
>> I had one and eliminated it.  Even with my f-ed up hands I never felt the
>> pull on a /2,/5,/6,/7 to be to hard even with the killer spring the R90
>> has..
>>
>> Your bike your money your opportunity to bond with the innards of your
>> drive train when this farkle leaves you stranded.
>>
>> You have been warned.
>>
>> Eric
>>
>> *From:* Mac Kirkpatrick
>> *Sent:* Monday, August 17, 2020 11:43
>> *To:* PA Airheads List
>> *Subject:* Benefit of EZ Clutch
>>
>> I ordered and installed an EZ Clutch pull from Bench Mark Works some time
>> ago and really like the greatly reduced clutch pull.
>> Well I found out  today that due to the greatly reduced clutch pull, the
>> clutch cable will now last a lot longer, IOW much less pull on the cable =
>> far longer clutch cable life and that reduces the necessity to have to
>> carry an extra clutch cable. Although I still will carry an extra one!
>>
>>
>> Mac Kirkpatrick
>> Glenmoore, PA
>>
>> "After all, what is adventure, but inconvenience, properly regarded?"
>> C. Donahue
>>
>
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