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Old 2019.06.28, 06:48 PM   #16
mugler
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Join Date: May 2009
Location: SoCal
Posts: 394
Our Verison Of Box Stock Rules (in Reality Near Box Stock)

As promised just sharing the more comprehensive list of Box Stock guidelines we have developed over the years & go with in our area when we do run it. Things always evolve as necessary and as you can see we're still trying to figure out a few ongoing items most notably front tires & what to allow for 86mm WB.

Chassis:
Kyosho RWD Only
- but for now we allow MR ASF chassis too
Radio:
KT-531P Only ( come with RTR RWD)
- but for now we allow any Radio with ASF equipped cars only

Motor:
- MZ9P (comes with RWD)
- md009p (AWD version of white cap Mabuchi motor - more torque, as an option)

Gearing:
- Open gearing based on Kyosho stock gear diff and pinions included with the RTR RWD.

Wheel Base:
- 86*,90,94,98,102.

Body:
- No Lexan Bodies, Only Plastic Kyosho (ASC or white body with all pieces) ,TRP, Jomurema, GL bodies with original rear wing ( no aftermarket wings).
- No Lexan windows allowed.
- If original wing is broken or lost body should be run without one.
- Missing side mirrors, canards and other pieces are OK.
- Thinning out wheel wells for clearance an eliminating long front spoilers allowed.
- Cutting out body pieces & thinning out the body to save weight or improve aerodynamics not allowed.
- Drilling holes or even eliminating the “rear” windshield only to clear the Kyosho friction shock is allowed as well as thinning out the roof for the same purpose.
- At discretion of race director body can be brought back up to stock weight using golf lead tape or something similar if its deemed to be too light.

Mounting the body:
- Aluminum front Body mount base and carbon fiber adapter plates like the ones from PN allowed ( to avoid stripping body mount holes on the chassis which is very easy to do)
- Some of the newer ASC bodies included with the RTR RWDs come with side clips installed too low or high …detaching and re-gluing as necessary is allowed.NOTE, shaving off bottom of the body to then be able to mount it lower is not allowed.

Tires:
- Open Brand Rubber material only. (*)
- No saucing or cleaning of any kind except with iso alcohol. ( we never clean unless if tire comes into contact with oil or grease by accident)
- No CA gluing tires to rims, only tire tape to be used for this purpose.
- CA anywhere on tire sidewalls is allowed.
(*) When we get a chance we’ll be testing the short K- front tires and if they’re good enough we’ll make those the spec front tires as they do not require truing and this plays into keeping box stock more light hearted.

Wheels:
- Plastic spoke wheels only of any brand and any offset allowed.

General Misc items & Mods:
- Any brand T-Bar allowed
- Aluminum T-Plate mount allowed ( for durability to avoid stripping screw holes on chassis)
- Any Brand Front Springs allowed
- Reversing original king pins allowed.
- new Replacing steel upper arm balls with aftermarket derlin balls allowed (example PN Part#: MR3039 - frees up the balls movement (compared to stock steel) on lower front suspension arms when king pin is reversed)
- Shimming T-Bar at motor mount and or T-bar holder allowed using shims of any brand or material.
- Any grease or fluids on any part of the chassis, drive train or motor allowed ( doesn’t apply to tires , see tire rules)
- Using longer screws to hold the front body mount to limit arm travel allowed.
- only kyosho plastic motor mounts allowed for all WB-es.
- Any brand & any material DDS which can be adapted to any of the Kyosho Plastic motor mounts allowed. Any brand and material bits and pieces to allow adaptation of DDS to kyosho plastic mounts are allowed.
- Only Kyosho friction top shock allowed (not mandatory).
- Soldering motor wires to the board allowed.
- Replacing board & battery terminal wires to thicker gauge not a good idea and left to race directors discretion case by case.
- Any aftermarket wheel nuts allowed
- Removing capacitor from motor allowed ( our racers understand this may cause overheating of the motor, Fets etc)
- Only plastic shims of the kind included with the RWD can be used to adjust front ride height ( as many as necessary)
- Any kind of reaming, polishing of the front king pins and knuckles for smoothness is allowed.
- Ceramic bearings NOT allowed, there are ways to check this and race directors encouraged to do so.
- Degreasing and applying light oil to bearings allowed, running dry bearings also allowed.
- Cutting original battery clips to any desired shape allowed. (changes flex characteristics of the chassis)
- After market servo gears not allowed except for 4th servo gear.
- Changing Servo motor with one other than same as original not allowed.



Grey Areas & items for which final rulings were not made yet so still allowed:
- if narrow front bodies can use wide front suspension holder instead and -1 offset for clearance when possible.
- * For 86 mm WB since there’s a huge inherent performance handicap & no known DDS system available we’ve been allowing all mods for this wheel base only even though this is not in line with the spirit of box stock….until we get to run more box stock again and come up with better solution for 86mm.
- Allowing slight reduction of height on the front end just behind the wheel wells as a measure of clearance even though this delves into the grey area of reducing body height which is not allowed if its done on the entire body.
- Again we’ll be looking into making kyosho short front tires spec for front after testing, rear tires will remain open rubber of any brand.
- In case of failure if it’s necessary to require the use of original potentiometer only that comes with MZ414 - not enough info as of yet if they're the same or there's an advantage using a different one.


If a hop-up or modification is not mentioned then by default it is not allowed, for example even though adding FET’s or drilling chassis not mentioned they are still not allowed.

Last edited by mugler; Yesterday at 08:39 PM.
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