Ocfjr,
Which thread was Richard C’s post in? Have gone back 60 days. Still haven’t found it. Would like to review :read: the thread.
Thanks
Richard isn't on the forum, he's on the Micapeak FJR1300 listserv. That's why I posted his comments here.
The original thread from the forum is
HERE and can be summarized like this for the throttle issue:
>From 'Constant Mesh' - (The problem)
The throttle cam profile is not progressive. It's actually the opposite of
progressive, maybe could be called counter-progressive.
In a progressive tax rate system the marginal tax rate increases as income
level increases. In other words the slope of the curve is steeper for higher
levels of income.
>From this analogy the throttle cam is the opposite of progressive. If you
plot a curve of throttle butterfly percent open versus throttle grip percent
open (throttle valve on vertical axis and throttle grip on horizontal axis)
the slope of the curve will be at its maximum at lower throttle grip
positions.
At lower throttle grip openings the rate of change of the throttle valve
opening is exaggerated. As the throttle is opened more and more the rate of
change decreases.
Seems to be just the opposite of what would be desirable. Someone must have
concluded that the FJR was too subdued at low throttle positions. So they
exaggerated the throttle control, giving the rider more bang for the buck
for small changes in throttle position.
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'jwit6' again -
Next thing to fix is the non linear throttle cam issue. Fred H went with a
piece of 14 guage copper wire wrapped around the throttle body cable spool.
It works, but it's not symmetrical. Same effect could be had by modifying
the curve on the throttle grip spool. And there is a product that might fit.
It's called the G2 Ergonomics Throttle Cam System. www.g2ergo.com . See page
26 of the December Cycle World.
-------------------------------------------------
Update post -
Well I asked the tech at g2ergo about using one of their throttle tubes on
the FJR and they said they had already done it. Here's their reply...
Hi,
"I have just the thing for you! Actually the VERY first FJR that I
put a TCS on lives in Slovia which is a country by Yugoslavia. He was an
excellent tester and we even talked on the phone a few times. If you get the
tube that I make for a street bike and my #400Y cam it will make your bike
PERFECT! I will guarantee it 100% and it will fit in your stock housing, NO
OTHER MODIFICATIONS!...Sam"
--------------------------------------------------------
Order info -
Just ordered it. Shipping Monday. Gave me a full money back guarantee. Sam
says "....it
is made of 6061 aluminum and so is the cam. The tube costs $39.95, the cam
is
$20.00 and the freight will be $4.05. ($64.00)." He has an impressive
clientel. Doug Henry, Pridmore, Jordan, and Honda race teams. Says he just
signed a deal with Lockhart. Street bike versions are not on the web site
yet, so you have to call in to order. 815-718-5860 if you're feeling
adventurous.
--------------------------------------------------------
Results post -
Received the throttle grip tube and cam today. Installed it and took a test
ride. It's a perfect fix. Throttle response is smooth and predictable.
Plenty of throttle available if you crank it on, but very controlled and
discreet at small openings. Slow speed maneuvers are a breeze. Also a
noticeable decrease in the amount of effort required to hold the throttle
open at cruising speeds. The reshaped cam profile provides a welcome
mechanical advantage over the throttle body return springs. No need for
Fred's fix, no need to remove a return spring.
Combined with the clutch slave cylinder retrofit, the bike takes on a silky
refined feel again. Nice tight trans, no perceived drive line slop. Smooth
imperceptible 1st/2nd/3rd gear shifts. Just the way it's supposed to be.
For those with the ability, you could save some bucks and reshape the
existing throttle tube to match the G2 Ergonomics #400 cam yourself. But
it's so easy to just bolt up their stuff and go. So all the whining about
the 06 throttle and clutch can be fixed for less than $140.00. To me it was
worth every penny.
Once I get the seat squared away this one is gonna be a keeper. And that's
quite a statement coming from a guy like me who tends to park a new bike in
his garage every other year.
The link above also contains info on swapping the earlier clutch slave cylinder to the '06 to lessen the force needed to pull in the clutch lever, etc.
