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June 30, 2003
Dear Mark,
I had a problem with my 2003 FJR that my dealer was not able to help me
solve. A product from Techlusion solved the issue.
Here is my story:
While riding my FJR with the engine speed between 2000 and 3000 RPM and
a neutral throttle (no acceleration, no engine braking) the engine stumbled
or ran rough and making the drive-line buck. At times, it was extreme enough
that you would need to disengage the clutch and do a lot of clutch work
to ride smoothly in that engine speed range. This problem prevented me from
enjoying the FJR in a large percentage of common riding conditions. When
commuting I am frequently in the 2000-3000 RPM range. On the highway, when
cresting a hill and letting off the throttle, the drive-line whips forward
and back. I was concerned that this would cause excessive wear in the drive-line
gears. This issue prevented me from enjoying one of the FJRs best features
... the massive torque in the low RPM band.
I brought my FJR to a Yamaha dealer who test rode my bike and diagnosed
it as "lean fuel/air mixture in the 2000 to 3000 RPM band". They
were sympathetic of the problem but could not offer any Yamaha "approved"
solution.
I read about some different fuel injection controllers that seemed a bit
expensive and that might be difficult to program. I chose to try a fairly
simple and relatively inexpensive ($189 plus shipping) product called the
Techlusion TFi-1020 ( http://www.techlusion.com/home.htm ). It's a digital
device that taps into the fuel injection control lines to lengthen the injection
pulse by a programmable amount. It is a digital device but is is tuned in
a simple format typical of a carburetor with idle mixture, main jet and
accelerator pump settings. You can also set the RPM where the idle mixture
and main jet settings crossover. I bought the TFi-1020 from Techlusion,
installed and tuned it and here are my findings.
The TF-1020 made an enormous difference in the ride-ability of the my FJR
in the 2000 to 3000 RPM range. Now, the engine runs smoothly at any speed
and throttle position. The drive-line bucking is gone leaving just the normal
lash of a shaft-drive. Throttle response is the way it should be ... pure
and tractable.
Thank you,
Steve Drake
Concord, MA |
| Here's a quote from MCN tester Mark Tucker,
on his long term test TOM900. 'The change in response and midrange grunt
was astonishing. I particularly felt it when stringing uphill tight corners
together in Scotland. There was no need to rev it hard anymore. It'd pick
up smoothly from 2000rpm and really stomp in at 4500rpm.' , the stalling
problem I've had when the bike is warming up has gone away'. |
| I came to this sight to find wire diagrams for
my bike. i've already installed your tech box in my 02 r1, it works great
and i can feel the difference. once i had the injector color codes the install
took maybe 10 minutes, then just tuning from there. keep me updated on new
applications for my bike |
| |
