Yamaha has almost
always made sportbikes that outhandled,
out of the box, most any other sportbike.
The yzf 750 was no exception. Easy
to setup and ride, a nice one still
is a sweet handling bike - even
in 2010. Sure, there were some Yamahas
that missed the mark in the handling
area (and I got to race a couple)
- but all the yzf 600 / 750and xj
550 / 600 models were simply sweetly
balanced machines.
Ahh.. I remember
the sweeeet 110mph, 2 wheel drifts
in the old turn 10 at Sears
Point Raceway (Infineon, now..)
But.... on to your bike.......
The
YZF750 had a 2-3 hp problem with
the high rpm fuel curve.
The carburetor would "lean out"
(cutting a few hp) as the rpm increased
to redline. Increasing the main
jet size helped the high rpm lean
problem, but made it too rich at
9k-10k rpm (losing power). The #1.7-rk
RaceKit flattens and corrects the
fuel delivery curve, preventing
high rpm power loss.
The
debut of he Factory Pro yzf750 "1.7
RaceKit".
It was first used to win the A Superstock
(1100cc class) WERA National Championship
at the 1994 Grand National Finals
at Road Atlanta by Thomas Wilson,
riding the Scott Beach / Michael
Tjon tuned, Team
Kinko's YZF750r. The 1.7-RK RaceKit
was later used by AMA Supersport
racer, Anthony Lupo, who rode for
us and also used on Tom Kipp's Vance
and Hines yzf (a formerly "big secret"
- but an ex team member related
the story of how they got our kit
).
We happily helped carry Yamaha's
flag, with a small investment from
Yamaha, and did very well, with
creative ideas, hard work and good
R&D using the EC997 dynos - and
we were happy to do it. In
2006, Yamaha did very well, with
a lot more of their money......
We later did the same quality work
for Italy's Belgarda R6 Yamaha bikes
when they had the fastest 600 World
Supersport bikes.
Long Boy Fuel Screw Kit $89.95 pn: 3020m1
with 4 new extended screws, springs, washers and o-rings.
2.
"Long Boy" Finger and screwdriver adjustable extended Fuel Screw
Frustrated with trying to find an "almost 90 degree" screwdriver
to fine adjust your fuel screws for best idle and cruise?
Use Factory Pro's new "finger adjustable" fuel screws to adjust fuel
screws for best throttle response. Traveling to high altitude? It's
easy to lean out the lowend temporarily.
Make your life easier!
Installation:
Remove old short stock fuel screws, old o-rings, old washers and old
spring. The o-ring might be stuck in the carb, so, take a light and make
sure it's really out if it didn't come out with the screw (or you can't
find it after you took out the screw)
Use a small bent wire to pull it out if it doesn't drop out. Keep the
old parts for "spares".
Each screw assembly comes with:
4 Long Boy fuel screws
4 new o-rings
4 new washers
4 new springs
Would you imagine
that you could buy the exact
same carb kit that helped
the AMA stock class Yamaha 750 win the
1100cc "A Superstock" WERA National Championships
in our own Team Kinko's bikes in
1994 with Thomas Wilson riding at
Road Atlanta?
and
The exact same carb kit that
V and H rider, Tom Kipp, used in
his dynojet sponsored AMA winning
bike? In 1995, an ex VHR race team
member confessed that they, mid
year, had somebody else buy our
1.7-RK RaceKit and change the cam
timing to what we told them, at the beginning
of the year :-)
We could even tell you that the
best cam timing on that bike:
with a stock cylinder head -
106-108lc intake and 101lc exhaust
and with a full radius
valve job, the bike wanted 104lc
intake and still, 101lc exhaust.
NOT 105 / 105.
Could even let you
in on a clutch basket mod to stop
the chattering under hard launches
(look in our Tech Section for chattering
clutches).
This "1.7-RK RaceKit"
requires some drilling and tapping
to install, but easy to do with
hand tools. Use with stock or aftermarket
exhaust. This carb kit makes best
power, overall. At every rpm. Period.
Was used by every top Pro
AMA yzf750 roadracer and absolutely the
best performing kit for on and off
track use. Best low, mid and topend
power. At the end of 94 - absolutely
no top AMA Yamaha teams were using
any carb kits developed on a dynojet
dyno (that's a hint about dynos)
When properly tuned, this kit produces
the best low-end and midrange possible
- and adds 2-3hp to the topend power
and revs even higher before
dropping off.
The kit, when properly tuned, adds
more low-end / midrange and if the
proper main jet is selected, more
topend power. Easy to install and
tune - no slide drilling!
Make
float height setting easier! Pick
up a Float Cage Holder for Mikuni
38mm carbs -
Click here
TECH Notes:
1.
Check needle jets for wear!
2. EXUP motor (or similar) MUST
be attached or engine will not rev
above 4000 rpm
CRB-Y73-3.0 $149.95
(if using pod filters)
usa bikes
Config 30 carb kit
Requires removal of stock airbox
and running K&N or equivalent individual
air filters. Otherwise, it is a
drop-in kit. Low-end response is
as good as, if not better than stock
carb tuning.
Make
float height setting easier! Pick
up a Float Cage Holder for Mikuni
38mm carbs -
Click here
TECH Notes:
1.
Check needle jets for wear!
2. EXUP motor (or similar) MUST
be attached or engine will not rev
above 4000 rpm
Factory
Pro manufactures stock replacement
needle jets!
(called emulsion tubes by
some) to original factory specs.
The needle jet
orifice wears oblong in as little
as 10,000 (but commonly 20,000 miles)
miles and is particularly aggravated
by "in town", low rpm operation.
The result is excessive richness
at low rpm that can only be partially
compensated for by lowering the
fuel level.
A direct replacement for worn, original
items. Accepts standard standard
Yamaha jetting and our Factory Pro
Carb Recal Kits.
Also fits other
bikes with 38mm downdraft Mikuni
carbs, such as Ducati, TDM 850
/ TRX 750 and 800, fzr1000 (89 and
up, but not including the Thunder
Ace).
Includes Factory Pro Microbearinged
Detent Arm, slightly heavier duty
detent spring and gasket. Makes
shifting more positive at the expense
of slightly stiffer shift lever
action. The stronger detent spring
rotates the shift drum faster, so
the gears are more likely to engage
under quick shift conditions. The
Microbearing removes friction for
the quickest shifting.
Yes, that's
what we all used in 93-94 to make
shifting super slick! The kit will
make the yzf 750 shift better than
quite a few 2018 bikes.
The pivot screw screws into a
raised boss in the crankcase.
YZF 750 references:
D and D, Team Kinko's, Vance and Hines, Tom Wilson, Jason Pridmore, Scott Beach,
Robert Nutt, Tom Halverson, Jim Leonard, Tom Kipp, Anthony Lupo, Mark Cassina, Scott
Ruehle.
Float
Height Setting Trick for 38mm "Mik's"
One of the
problems with setting the float
height on the 38mm downdraft Mikuni's
that come on Ducati's, yzf 750's,
tdm 850's and fzr1000's, is that
the darn white plastic "float cage"
keeps popping out of the carb body
unless you hold it in.
When you hold
it in with your fingers, you always
flex the cage frame and distort
the reading that you are setting
the float height at..... Aaarrggghhh!!
:-)
After spending
45 minutes setting some yzf750 carbs
in the sweltering Mid Ohio heat
of summer, I decided to make a float
cage holder and sell 'em! I'd make
a million $$!!
When I got
back to work, I set up and made
a pile of cute little flat braces.
As I was sitting
there, admiring my cleverness......
one of my parts guys wandered by
and asked what was I making? I showed
him that you could just take my
clever little piece of aluminum
and hold those float cages right
tightly up into their seated position
- so you could get consistent float
height readings.
He says.....
It looks like you could just put
the float bowl on with the front
holes on the bowl lined up with
the rear holes on the carb body
and slap some screws in and it would
do the same thing...........
I bought him
lunch with the million $$ I didn't
make....
Marc
Hello. Here’s the pics you
asked for! Thanks for the
help, the bike runs BEAUTIFULLY
now, lots more power! The
front end now comes up on the throttle
– whereas it didn’t before!
There’s another pic in there too
where I used a bar code to measure
the bowls. I found this a
lot easier than using a ruler.
I measured the bar next to the number
“8†on my barcode to be the recommended
height on my bike – 14mm.
-Mike Beary
Thanks Mike, for the pics!
Marc Salvisberg
Absolutely NO carb parts sold in California.
New and improved Suzuki Teka SFI 2
with new TPS display and "MMT" Memory Module
Tuner
Finally - Quick, easy, cost effective
Suzuki
tuning with no expensive "add-on boxes"
Suzuki cruisers and sportbikes
And most
importantly
Restart back at the HOME page and click on the red box in
the top left to find the bike that you want parts for...
restart at HOME page
This Tuning Site has been visited by
people. www.digits.net - the
oldest counting service on the web
We use a variety of proven drills and training techniques.
Practicing these techniques with our Yamaha dirt track trainers will
enhance your abilities both on the track or the street.
It doesn't matter what you ride or race, the Rich Oliver Mystery School
improves everyone's skill level and mindset!
WW2 vintage flying Special
Book a sightseeing flight over the Wine Country
or a Kamikaze aerobatic flight or a biplane flight over famous
Sonoma Raceway,
the Golden Gate Bridge and the San Francisco Bay for one or two during
the spring and get a free souvenir t shirt!
(NEW! Ask about the P-40 flights!)
707 938 2444
Just tell them that you
saw this on the Factory Pro website!
Marc
Northern California's most unforgettable flying experience. No
experience required. Open weekends!
The extension of the laboratory
for engines of the Swiss Federal Institute of Technology was completed
in about 1935. Its architect was Rudolf Otto Salvisberg (1882-1940).
He had a successful career in Berlin but returned to Switzerland after
the advent of the Nazis. His architectural style was somewhat similar
to that of Erich Mendelsohn. The staircase of the laboratory is in normal
use but well preserved.
Edited to the tunes of Chemical Residue by Herbie Hancock.
