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Yamaha FJ1200,
86-94
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Yahoo |
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Yamaha FJ1200,
86-94
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Yahoo |
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Carburetor Tuning Kits |
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CRB-Y08-1.0 $139.95 |
 
Boosts power a bit at full throttle, improves throttle response - especially at low rpm and part throttle, smoothing power delivery. Engine runs a bit cooler and usually smoother. Comparison to dj kit: Much better driveability when properly tuned. |
CRB-Y08-1.1-ti $159.95 |
Titanium needles, drop-in kit uses Stainless Steel allen screws instead of zinc plated screws as in the #1.0 kits, otherwise, the same dimensions and jets sizes as the #1.0 kit. Comparison to dj kit: Much better driveability when properly tuned. |
CRB-Y08-3.0 $139.95 without filters |
Use if you remove the stock airbox and replace it with individual filters. Use with aftermarket exhaust, makes best maximum power. Comparison to dj kit: Much better driveability when properly tuned. |
 CRZ-EMU-100112k $132.00 set of 4 pcs |
Ok - The average 1200 has accumulated a large number of miles
- and by now, many of them have carbs on them that have really funky super-rich
low rpm running "feature". Sound like yours? 99% of the time, on a high mileage 1200, the needle jet
orifice part of the "emulsion tube" probably looks like an egg. That will allow too much fuel to rise up into the bore of the carb, decrease the engine's power and cause rich low rpm cruise and rich full throttle, low rpm running.... (Sound like yours?) These needle jets are NOT what Yamaha would sell as replacements - They are full patented new design that atomizes fuel to a finer degree - allowing a leaner burn w/o misfire and more power potential - along with 20th century improvements, like hard plating for longer life - A suggestion? Before you start trying to make your FJ run right or even attempt to properly jet, replace the emulsion tubes. |
Feedback
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Transmission Shift Improvement |
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SHFT-PRO-YAM-5 $99.95 (special order) |
Now that you've replaced the 2nd gear, it's mate and it's shift fork - Install this kit to make 2nd gear stay alive for years. Oh - nicer shifting, too. Includes: Factory Pro Microbearing Detent Arm, Heavy 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 eliminates much friction, allowing the
shift drum to rotate quicker for fewer missed shifts. Especially helpful
in decreasing the 2nd gear and shift fork wear that the FJ1100's, FJ1200's
and other bikes with large, heavy transmission gears are so well known for. |
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SHFT-YAM-5 $49.95 |
STD transmission detent spring kit Includes Heavy 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. Especially helpful in decreasing
the 2nd gear and shift fork wear that the FJ1100's, FJ1200's and other bikes
with large, heavy transmission gears are so well known for. |
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Ignition Components |
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Tools |
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 TL-float height gauge $59.95 |
The only way to accurately measure float
heights. Works on nearly every carburetor. More information on how to set floats, resultant fuel level, it's effect on low rpm fuel delivery, pictures..... Float Height Page |
| Does NOT
fit 86-87 models, RTR-YAM-6 $89.95 1. Choose your shipping method 2. |
Ignition Advance Rotor |
| Yamaha, fj1200,
all years 84 Yam pn: 16H-14141-90-00 CRZ-EMU-100112k |
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Factory Pro nickel plated replacements in stock HDJ Upgrade! |
Subject: FJ1200 Tuning
Date:
Sat, 20 Jan 2001 11:50:26 -0800
From: "georgef"
<georgef@c2i2.com>
To:
<factory2@ix.netcom.com>
Thank you, thank you, thank you for your excellent site - who would have ever thought
that lowering my float level .040" / 1mm would have transformed my bike so much.
1990 FJ1200
#45 pilot
needle #1170i-90q70rt
clip on /3 = center position
#132.5 main jets
fuel screws 3 turns out
Mid Arizona
70 degrees
1400 sea level
factory air box with six 1inch holes
K7N filter
Glad it all worked out, George. I think it's
best to teach how to solve the problem!
Thanks for the feedback!
Marc
Feb 03,1999
Hello,
I have a 1991 Yamaha FJ1200, and saw a tech article in Rider magazine about a problem
that these bikes exhibit. At low speed, the throttle is nearly "light switch" touchy
on my bike, and the article said that this was normal for FJ's but there was a solution.
The article went on the explain that the FJ1200 has a very sharp ignition advance
curve, about 33 degrees difference from 1000 to
2500 rpm. I checked the shop manual and saw that this was correct.
Rider magazine referred to your company as one offering a fix for this tendency.
I checked your website and noticed that the FJ1200 was not listed (or I didn't see
it) and was wondering if you offer an ignition advancer for this bike and at what
cost. Also, do you know why the factory would put such a sharp curve in the advance
of the ignition? Normally this is not a problem, but at parking lot speeds it can
be quite a handful, as you can imagine.
Any help you could give me would be greatly appreciated.
Thanks!
Chris D.
Well, well, there's an FJ1200 page now!
Actually, the problem is twofold - the low-end
carburetion is too lean and the ignition timing curve is pretty aggressive at low
rpm.
Try adding the advance and see if that's enough. Adding the Carb Recal Kit and the
advance will cure the FJ's "twitchy throttle" when properly tuned.
BTW - The FJ1100 needs the carb kit before the advance - as the advance alone will
cause a light pinging at cruising speed when going up slight hills on the freeway.
Thanks for the question,
Marc
| Carb overflowing while sitting |
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Float Height Measuring "touching, but not compressing the float valve spring" |
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Needle Jet wear (sometimes called "worn emulsion tubes) |
Inspect your brass needle jets for wear when you
take out the needles. If the needle jets have oval wear pattern, they
will allow too much fuel to pass by the needle causing excess low speed
richness. The fuel will also consist of more, large drops, rather than small droplets. Large drops of fuel tend to drop out of the airflow and not burn. Check out Tech Section for "Needle Jets, Mikuni, worn" Tech |
Go to
General Technical Support
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LINKS People ask me how I select the below links - as they aren't all mc related. The below links are people and companies that are consistently impressive with their continual uniqueness and dedication to providing traditionally valued, quality products and services. Marc |
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EFI and Carb Tuning by Wheelsmith Racing | ||||||
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The Rich Oliver
Mystery School will help you discover your hidden inner strength.
It will challenge you. It will teach you a new way of thinking, and a new way of riding. You can take your riding to an exciting new level! 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! |
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Factory Pro Spring Special! Book a sightseeing flight
over the Wine Country or a Kamikaze aerobatic flight or a biplane flight
over Infineon Raceway, the Golden Gate Bridge and the San Francisco
Bay for one or two during the spring and get a free souvenir t shirt! 707 938 2444 |
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| 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. |
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Maybe in next rewrite, he'll fix the ignition timing and dyno chapters... Otherwise great book with great starting ideas. |
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My bible |
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The little blue bible for quick references and little known facts. |
