I have what Harry posted earlier in the year. Here it is. I don't know if any revisions were made but I'm sure Harry can post.
IT’S TIME TO BREAK OUT THOSE 650s !!
The first Formula 650 race will take place at Long Beach Grenada Street on April 23-24.
For those that missed the earlier threads, F650 is an inexpensive entry-level closed course class that utilizes Yamaha and Kawasaki 650s that run a stock pipe and any size single carb. All F650 races will be dead engine start, and off limits to anyone who has raced closed-course pro-standup in the last 5 years.
Attached at the tail of this post is the detailed language of the F650 class rules (for those interested).
Formula 650 class will be offered at all the remaining Region 1 events being put on by Everclear (LB Grenada & Cahilla), and the four Desert Steel events at Havasu.
AT ALL THESE EVENTS, GROUP K WILL BE PAYING CASH PURSES TO THE TOP THREE FORMULA 650 FINISHERS THAT PASS POST RACE TECH (1st $150, 2nd $90, 3rd $50)
In addition, Group K plans to be on hand at all events with “spec� versions of a F650 Yamaha and Kawasaki for folks to take short sample rides.
Aaron at Everclear says that F650 competitors will all pay the novice entry fee ($80). It’s the only class where amateurs can win back their entry fee.
If you have any questions about clarifications on the rules, please email to:
groupklemm@aol.com
F650 Rules
The following rules for Formula 650 are based on the IJSBA Stock classification rules with the following exceptions.
A) THE ORIGINAL STOCK CLASS RULE STATES:
6.3.1 Engines may be bored. Replacement piston assemblies may be used provided
the original port timing, compression ratio, dome profile, skirt length and shape
and type of material are not changed. Replacement piston assemblies must
weigh within ±25.00% of original equipment. Oversize pistons must not exceed
1.00mm (0.04 in.) larger than the original piston size. Engine displacement must
not exceed class designation (e.g., 550cc in 550 Stock, 800cc in 800 Stock,
etc.). Chamfering of cylinder ports must not exceed 1.00mm (0.04 in.) at a 30
degree maximum angle. (See diagram in Appendix.) No additional holes and/or
fuel passages of any kind in replacement pistons are allowed.
A) THE F650 VERSION STATES:
6.3.1 Engines may be bored. Replacement piston assemblies may be used provided
the original port timing, compression ratio, dome profile, skirt length and shape
and type of material are not changed. Replacement piston assemblies must
weigh within ±25.00% of original equipment. Oversize pistons must not exceed
2.00mm (0.08 in.) larger than the original piston size.
B) THE ORIGINAL STOCK CLASS RULES STATE:
6.3.5 No internal modifications of any kind, including grinding, surfacing, polishing,
machining, shot peening, etc., will be allowed on any engine components.
6.3.7 Cooling system flush kits that do not create a hazard will be allowed. No other
additions or alterations to the cooling system will be allowed.
B) THE F650 VERSION STATES:
8.3.2 Original equipment crankcase must be used. Internal modifications to the
fuel, oil and/or water-exposed surfaces are allowed. Filler material may be
added to hollow pockets in the base gasket areas. Base gasket and intake
surfaces may be machined. Bearing and seal surfaces may not be modified.
Crankcase drain system may be removed and plugged. Repairs to cracked or punctured
crankcases may be made provided only one damaged area affecting one
cylinder bank has been repaired. No other external modifications or external
repairs are allowed.
8.3.4 Original equipment cylinder must be used. Base gasket, head gasket and
exhaust manifold gasket surfaces may be machined. Port heights, widths and
shapes may be changed. Ports may not be added or deleted from cylinder.
Cylinders may be machined to accept aftermarket cylinder liners. Filler material
may be added to hollow pockets in the base gasket areas. No other material
may be added. Additional water-cooling fittings may be added to cylinder-head only.
8.3.5 External modifications to the engine finish (e.g., plating, polishing and/or
painting) are allowed for cosmetic purposes only.
8.3.6 Cylinder head may be modified or aftermarket.
8.3.7 Engine gaskets may be modified or aftermarket.
8.3.8 Exhaust system (i.e., manifold, head pipe, expansion chamber, waterbox,
muffler(s), etc.) must be stock oem. Through-hull exhaust may be
modified or aftermarket, providing a hazard is not created. Exit location of the
exhaust gases may be relocated to the transom below the bond flange. No
tuned portion of the exhaust system shall protrude outside the hull.
8.3.9 Aftermarket cooling lines and water bypass systems may be used. Bypass fittings may be modified, after-market and/or relocated but must be directed downward and/or rearward so
as not to create a hazard for other riders. Any valves used within the entire
cooling system must be of the fixed type or automatic (e.g., thermostats, pres-sure
regulators, solenoids, etc.). Manually controlled devices (by any means
of actuation) that alter the flow of cooling water during operation are not
allowed. Cooling system flush kits are allowed.
8.3.10 Replacement starter motor and bendix may be used.
8.3.11 Replacement engine mounts may be used.
8.3.12 Oil-injection system may be disconnected or removed.
8.3.13 Replacement of general maintenance parts (e.g., spark plugs, spark plug
wires, spark plug caps, wiring, water hoses, fuel lines, clamps and fasteners)
shall not be restricted to original equipment. Stripped threads can be repaired.
C) THE ORIGINAL STOCK CLASS RULES STATE:
Aftermarket flame arresters that meet USCG, UL-1111 or SAE J-1928 Marine
standards may be used. Carburetor jets (replaceable type), needle valves and
needle valve springs may be changed. Choke may be removed provided additional
air intake for the engine is not created. Aftermarket primer system may
be installed. No other carburetor modifications will be allowed.
C) THE F650 VERSION STATES:
Single carburetor only, may be modified or aftermarket provided they do not vent or spill fuel at any attitude with or without the engine running. No dual carb inlet systems may be used.No slide-type carburetors. Aftermarket primer may be used.
Intake manifold assembly may be modified or aftermarket.
Aftermarket crankcase pressure operated fuel pumps may be used.
8.5.2 Modified or aftermarket vapor/air separators must not exceed 2 in. x 6 in., and
must have a return line to the fuel tank open at all times. Additional fuel reservoirs
may not be used. Aftermarket or modified electric fuel pumps, not
exceeding 4 psi, may be used. When the engine is shut off or stops, the fuel
pump must automatically stop. No manually operated on/off-type fuel pumps
are allowed.
8.5.4 The entire fuel system is a closed system. The watercraft must not vent or
spill fuel at any attitude with or without the engine running. Original equipment
fuel tank, fuel filler and relief valve must be used and cannot be modified. The
fuel pickup, fuel filter and fuel pet**** may be removed and/or aftermarket
parts may be used. Additional fuel filters may be used and fuel cell foam may
be added to the original equipment fuel tank. Fuel tank filler cap may be modified
or aftermarket provided a hazard is not created.
Flame arrester(s) which satisfy United States Coast Guard, SAE-J1928
Marine or UL-1111 Marine backfire flame arrester test standards must be
installed. Aftermarket flame arresters satisfying one of these test standards
are allowed. Reed valve assemblies may be modified or aftermarket.
D) THE ORIGINAL STOCK CLASS RULES STATE:
Impeller may be modified or aftermarket, providing that the original diameter
is maintained. Replacement wear rings that are within OEM internal diameter
specifications may be used. Silicone adhesive sealant may be used in addition
to original equipment seal to seal pump inlet. Visibility spout must be
removed or plugged.
No internal modifications of any kind, including grinding, surfacing, polishing,
machining, shot peening, etc., will be allowed on any driveline components
(e.g., pump stator, reduction nozzle, etc.).
D) THE F650 VERSION STATES:
Impeller may be modified or aftermarket, providing that the original diameter
is maintained. Replacement wear rings that are within OEM internal diameter
specifications may be used. Silicone adhesive sealant may be used in addition
to original equipment seal to seal pump inlet. Visibility spout must be
removed or plugged.
Stock OEM vane body must be used. Grinding, surfacing, polishing of the stock oem pump case and vane body is permitted.
Pump nozzle and directional nozzle may be modified or aftermarket. Overall length of the complete pump and nozzle assembly may be no more than 50.00mm (1.97 in.) longer than original equipment.
NON-EQUIPMENT RULES
Riders who have competed as a “pro-class� competitor in a sanctioned closed-course stand-up event within the last 5 years “will not� be allowed to compete in Formula 650 events.
All Formula 650 races will employ a “dead engine start�, with no holders permitted.
Linear Mode
