Chuck Sorrensen's Rocky Stargel factory RS250

Aprilia RS250
with Suzuki RGV250 engine

Super Seal Exhaust Manifolds

Aprilia 250 / Suzuki RGV 250

NOTE: RGV250 guys -
 These spigot MIGHT fit - look at the measurements towards the bottom of the page?


RTR-YAM-1-05     $89.95

1. Choose your shipping method

NOT for 250!!


Ignition Advance Kit - NOT for 250!

We do NOT NOT NOT NOT (not!) make an ignition advance kit for the  RS / RGV250!
NOT! No!!

The RS / RGV 250's use a different flywheel puller than a fzr400 or fzr600 that only a dealer would have.
The woodruff key from the RTR-YAM-1-05 is the same key that fits the RGV 250.....

If you buy the RTR-YAM-1-05 kit, you can use the supplied woodruff key and the installation instructions for the fzr400 / 600...... and you'll have a nice fzr400 / 600 flywheel puller tool, too!
NO! You can't buy the key without the puller, I know you can't use the puller - but - as I said, I don't make an RGV 250 kit......

This IS the key to use for the RS and RGV's.

In the engines that I've tested, this advance kit's key will improve power by 1 to 2 TRUE hp (that's actually "loaded" EC997 dyno, "Rich Oliver" sort of power - (I don't know about mythical inertia dynojet hp).

It's specifically suggested to NOT use the RGV "Suzuki kit" computer in a high compression RGV engine, as the kit box has much too much advance at high rpm  and, from one local customer's experience (yes, it's repeatable!) that a high compression 250 engine WILL detonate and seize or hole a piston at very high rpm when properly jetted........ every time, with the kit box installed......

Using the woodruff key advanced the timing for better power in a stock ish engine.


High Performance / leak resistant / Double O-ring / Stainless Steel
Exhaust Spigots

F-Pro Spigot Kit includes:

2ea 304 Factory Pro Super Seal Exhaust manifolds, Stainless Steel
4ea  39mm id x 3mm Viton o-rings

pn: EXH-AP20-SPI40SS 



1. Choose your shipping method



One of the hardest things to keep clean on your two stroke motorcycle is the exhaust flange / header pipe area. Two stroke oil always drools out and slowly bakes into an ugly, crusty mess.

One of the fastest ways to kill 250 high end power is to have leaky expansion chamber / stock exhaust headers - The pulsing pressure of a two stroke engine's exhaust is a major key in filling the cylinder to it's maximum - lose the pulse with a leak and "zippo"! - there goes your high rpm power.....

I bet you didn't know that Factory Pro started out in 2 strokes, did you!
We had the third fastest 350cc production RD350 on the West Coast in the early 80's. My current next door neighbor had the second fastest....... Also, that we held track records at Sears Point / Infineon Raceway. You may not have even known that Factory Pro EC997 dynos tuned (dynojet dynos don't work properly for 2 stokes) almost ALL of the AMA's 250GP bikes, including Rich Oliver's, and Roland Sand's  tz250s,  Chuck Sorensen's ex-factory Aprilia RS250, Simon Turner's TZ250 and John France's Honda RS250 and about 80% of the rest of the AMA guys, too.

Factory Pro / Marc Salvisberg designed these updated, all custom 304 Stainless steel manifold with super tight clearances keep the pipe from pivoting and rattling when revved and includes super sealing, tight fitting, replaceable,  dual metric o-rings.

Fits like a tight glove for stock or aftermarket 40mm exhaust headers AND, since they are stainless steel, they will never be covered in rust. Uses all stock bolts, nuts and flat flanges.

These may fit some other bikes, so I gave some dimensions to check your app.

for pipe fitting
40.25mm   So, it fits 40mm OD exhaust header with .25mm clearance
FPro SPIGOT OD:  49.6mm your stock flat exhaust flange ID needs to be bigger than this
where our spigot fits into the head
52.1mm where the exhaust flange seats into the head. You could easily trim down the FPro spigot OD a bit, if necessary.


Spare Parts

Buy 4 replacement Viton o-rings
These o rings fit the Jackel TZR 250 exhaust spigots, too.

$24 for new 4 Viton o rings  (39mm x 3mm)

1. Choose your shipping method

2. Buy Buy





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...
restart at HOME page


This Tuning Site has been visited by
people. - the oldest counting service on the web





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!

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!
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.