GL1500 F6c
Strong, smooth and very large, the Valkyrie is perhaps Honda's best interpretation of that American "Bigger IS better" attitude.
If you are over 6', and you wanted power, it is the choice to make!


The sweetest Valkyrie carb recalibration kits

CRB-H78-3.0-SBR    $169.95
 Steve Brown Replica Kit

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Steve Brown Replica Intake System

Bored with your Valkyrie's power?
Want to hear your intake howl at full throttle?

Mucho Modified Airbox:
Uses: stock replacement type K&N . Heavily modified airbox lid.

Adds ~8hp-10hp to full throttle / high rpm.  WAKE up! :-)
Dealer / Retail Special Order.

CRB-H78-1.0       $159.95
(if using the stock airbox)

For all years USA bikes

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Adds more low-end / midrange, and if the proper main jet is selected, more top-end power.
Includes pilot jets, needles, main jets, allen screws and more. Easy to install and tune - no slide drilling.

The Factory Pro jet kits are the kits that include #38 pilot jets.

many non USA bikes used 78 main jets - see below

CRB-H78-1.0 EURO     $159.95
(if using the stock airbox)

For non-USA bikes with 78 main jets

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Carb Kit - For non-USA bikes with stock 78 main jets
all years UK

CRB-H78-2.0      $169.95
AirBox Plus Kit (for slightly modified airbox)
does not include required K&N filter

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** Developed with the Cobra 6 into 6 pipes **

Slightly Modified Airbox:
Uses: K&N air filter without foam "Prefilter" installed. Remove rivets and baffle in top of the airbox lid.

Adds ~2hp-4hp to full throttle / high rpm.
Ignition Advancer - adds more "oomph" low and mid. 


Adds more lowend and midrange.

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Ignition Advance

Simply add 4 degrees of ignition advance to your Valkyrie. Perks up the low and midrange power and can improve mileage slightly, if jetted properly.

6 degrees is a bit too much for a Valkyrie, even if it's jetted properly.

Easy install - 1 hour. 

Pro Shift Kit - fewer missed shifts

Pro Shift Arm

pn: SHFT-PRO-H78 / MN5 / MCA-ceramic


replaces Hon pn: 24430-MN5-000 and MCA-000 arms

(415) 883-5620

And I  DO make a spring

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Stage 1

Low friction Pro Detent Arm Shift Kit

(w hybrid ceramic bearing)

You've done all the tricks and it shifts better, but still feels lazy and flaccid-

The F-Pro 52100 steel raced, ceramic balled microbearing equipped detent arm reduces shift drum rotational friction as compared to the steel "roller" version - resulting in quicker shifts and  fewer missed "quick" or "lazy"  shifts.

Help prevent gear dog and shift fork damage caused by missed shifts.

This kit will not fix missed shifts caused by already damaged gears and shift forks.

Takes about an hour to install.
Thx - Marc
(415) 883-5620 

(use our MCA spring for the gl1500)

Stronger F-Pro Shift Spring.

pn:  z95-HMCA-xxxx


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Stage 1

You've done all the tricks and it shifts better, but still feels lazy and flaccid-

This spring will make the shift drum complete it's

Help prevent gear dog and shift fork damage caused by missed shifts.

This kit will not fix missed shifts caused by already damaged gears and shift forks.

Takes about an hour to install.
Thx - Marc
(415) 883-5620

Special short D type, Honda / Triumph Fuel Screw Wrench 

TL-HONDA "D" WRENCH     $29.95

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SHORTY version -  shorty version required for Valkyrie

STEEL CONSTRUCTION Fuel Screw / Mixture Screw Wrench, "D" type

(as used on most modern Honda Keihin CV carbs)


True Rear Wheel Horsepower by Factory EC997 Eddy Current Dynamometer


User report - or "I did it My Way"
(sung with Frank Sinatra voice) -
Thanks for the pics and report, Steve)

Marc, It has been quite some time and weather has just started to cooperate but I have great news. I have been able to make the Valkyrie run real nice!!!
I had removed the top of the air box (some pictures included) and ported out the entire intake system. My final set up is as follows:
Pilot jet # 38 (included in the Factory Pro jet kit)
Factory Pro needle: Clip on # 3rd groove (from the top)
Main Jets have an orifice of .072" (thousandths) not sure what size jet that would be? (180, 182, 185 Keihin or  Factory Pro K series main jet, Marc)
Fuel screws @ 2.5 - 2.75 turns
It runs remarkably and pulls well from 1200 rpm in 5th gear.
The sound and acceleration is quite addictive!! It hits the rev limiter in 1st and  2nd before you know it!
It took me 13 tries to jet this setup. Please feel free to pass this combination along to anyone with confidence!
 Thank you for all your help and encouragement!
regards Steve Brown






















Steve Brown in his Magic Kingdom.








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

Please click here for more info

Contact Factory Pro
M-F, 9am - 5pm, Pacific time, -7 or -8 GMT

800 869-0497
 USA and Canada

415 883-5620

parts information

EC997 dynamometer information

Product Support /Tech SECTION
click here


Mailing / Shipping address:

Factory Pro
101c Roblar Drive
Novato, CA

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...
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EFI and Carb Tuning - Most all FI and carb tuning

by Wheelsmith Racing

Flight Training - train with AMA race winner Todd Harrington.

The Harringtons own American Flyers, one of the most established flight training facilities in the USA.

 8 locations

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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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!
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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.