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Old 2011.07.09, 05:40 PM   #1
arch2b
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Kyosho Stock Class Racing

Why Kyosho Stock? All of us started somewhere. For many of us, this was LONG ago when Mini-Z racing was in the early stages of being formally organized via the then Kyosho Mini-Z Cup and similar sponsored events. HFAY for example has it's roots in nearly stock class racing with the Kyosho box stock motor. Over time HFAY, like other series, has evolved and focuses mainly on modified stock and open/mod racing leaving little to no support for the beginner classes. We want to address this by adding a Kyosho Stock racing class to our club racing to help bring in new racers with more affordable entry costs so that they may participate and compete while learning if the hobby is indeed for them. They can choose to up the ante so to speak by joining our HFAY racing and other local events or some may find it's not for them and decide to move on to something else with minimal loss. With Kyosho USA's support of stock racing, we will be joining them in establishing this class and use the rules established by Kyosho USA for their stock class racing. We will be following this rule set as developed and revised by Kyosho USA for the basis of our Kyosho Stock Class. Who knows, if they ever decide to restart the Kyosho Mini-Z Cup series, we will already have experience with this class

Here are the Kyosho Stock Rules, (Ver. 2.3) Updated on 12-23-2019

Open to any Kyosho Mini-Z Racer FWD, RWD, and AWD Chassis, Iwaver/Fire-Lap Racer and AWD Chassis. Chassis can be any configuration including LM and wheelbases from 86mm to 106mm.

• Chassis - No modification (shaving or drilling unless absolutely required for proper part operation)

• Motor - User choice; Kyosho Racer and AWD Stock, or any manufacturer 3500KV or less rated Brushless Motor (PN V1, V2 or V3.1 ONLY), or PN PNWC 70 Turn Ball Bearing Motor (132370) or Kyosho 4100KV Brushless Motor (MZ606). 6-9T pinion gearing for brushed motors, 10T permitted for brushless. Please note use of 10T requires clearancing of motor spacers, etc. for proper gear mesh.

• PCB - No modification allowed except for updating to current PCB board. No Gyro permitted, no increase in quantity of FET's permitted. This accommodates periodic changes or upgrades in PCB design with regard to frequency, etc.

• Bodies - Must be Kyosho Kit or Autoscale body, or full painted and assembled white (unpainted) body. Modification (shaving or drilling for weight savings and aerodynamic gain, adding wings etc) not allowed. (Exceptions; hole may be drilled in rear deck lid of Ferrari F355 to allow for damper clearance as example, front splitter or low air foils that protrude to sharp points may be rounded at corners/edges.) custom painted bodies must be fully painted and ALL accessories excluding optional kit parts (rally light on Toyota Celica for example). completed body must be within 2 grams of original Autoscale weight (average weight of Autoscale rear spoiler). Bodies found to have greater deviation will not be permitted. R246, Iwaver,/Firelap, GL Racing Autoscales are acceptable.

• Wheels - Any Manufacturer plastic wheels only. Wheels/tires must be of appropriate width and offset for respective Autoscale and fit inside the body.

• Tires - Any Manufacturer brand rubber tire (No grooving, cutting or silicone based tires allowed)

• Batteries - Four AAA batteries. Alkaline, Ni-MH or Ni-Cd batteries may be used. No other type of battery may be used. For example: Lithium Polymer may not be used, Ni-Zn may not be used.

• Ball Bearings - Any manufacturer non ceramic ball bearings are permitted.

• Front Suspension - Manufacturer stock suspension and parts permitted ONLY. Optional front suspension springs are permitted from Kyosho Circuit Pack (MZW2019C, MZW2015MM, or MZW2015RM). Please note, there are three versions available, all are acceptable.

• Rear Suspension - Manufacturer stock suspension permitted ONLY and assembly appropriate for chassis type (example, LM stock configuration includes rear damper. Other kits include Kyosho Rear Shock Set #MZ206) Please note, as of December 2016, Kyosho has updated the Racer line to include the MM2 rear end with retail kits in stock form (not Limited, SP, Cup Class, etc.). MM2 Set #MZ217.

• H/T Plate - Any Manufacturer H/T plate permitted, must be appropriate to stock wheelbase for chassis configuration and Autoscale selection.

• Wheel Nuts - Any Manufacturer wheel nuts permitted.

Modifications to the rules
• If you put it on the track you acknowledge and accept the potential/possible outcomes therein, to include but not limited to lack of first place finish and or damage to car resulting from the track and or interaction with other cars on the track.
• Oils, lubes, greases, tire tape will be allowed in our series.
• Allowable ESC modifications are limited to the replacement in kind (same as stock) of fets and other board components.
• Autoscale modifications are limited to the minimum clearancing needed for operation of permitted equipment. Shaving bumpers, skirts, windows, etc. will not be allowed. Please choose your autoscale accordingly as there will be no exceptions made thus no excuses.
• Wiring must remain stock except you may replace motor wires with like wire. IE; replace stock motor leads with Turnigy 24awg wires. You may replace the stock antenna wire with like wire.
• FWD, AWD and RWD chassis may use the aluminum motor spacers to assist in dissipating heat.
• Kyosho SP Pinions are permitted as you get all 4 pinions sold in convenient parts kit. MZW119.
• Kyosho Circuit Pack (MZW2019C, MZW2015MM, or MZW2015RM) are permitted.


If here are any questions, please don't hesitate to ask and we will update this as needed.

MR-01 stock parts kits can be found here.
MR-015 stock parts kits can be found here.
MR-02 stock parts kits can be found here.
MR-03 stock parts kits can be found here.

Last edited by arch2b; 2019.12.29 at 01:31 PM.
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Old 2011.07.16, 11:30 PM   #2
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A refresher of the discussion on permitted options for those that may not have been around for them.

T plates often break as a result of crashes and replacements are only available within a parts kit that includes many un-necessary parts. I don't recall anyone ever breaking a spring. Loosing a spring yes, but it's rare that a spring breaks. I do see the merit in the discussion though and will discuss it further this Saturday.
MM t plate parts kit MZ204 $7: 1 plastic T plate and MM motor mount
RM t plate parts kit MZ210 $6: 1 plastic T plate and RM motor mount
Kyosho FRP T plat sets MZW410H, MZW410M, MZW410S, MZW409S, MZW409M, MZW409H $19: 3 t plates of a specific stiffness in either RM/HM or MM/LM. there are a few others in sets of 3 but include S, M and H at the same price range. the average replacement from PN or Atomic runs about $4-6 however are much more durable than plastic and your not saddled with extra parts that may or may not be used. i am still running the stock plastic h plate and i know a couple others are as well.

Ball bearings are not solely for performance but mainly to accommodate extended use of stock motors and extending run times. Our desire to maintain stock motor class requires concessions to make it viable in the long run. To this day I do not understand why Kyosho includes plastic bushings in kits. Even their mini-z cup allowed for ball bearings. I've given away more sets of bearings than many have ever bought and still keep a couple sets on hand just in case someone joins and doesn't have any and not comfortable paying for the Kyosho bearings. I never have and never will spend $$$ on high end bearings. I run the same $8 Boca bearings or bearings included in past purchased 'cup' kits. If TRC ever restocked the dry race bearings, i'd jump back to those in a heart beat but alas, TRC has not restocked in maybe 10 years.

Lock nuts are unsprung weight in the end. some swear by them, others prefer the plastic. In the end, they are not a performance part but used in effort to reduce chance of loosing a wheel during a race, despite the high entertainment value it typically provides. I've had better luck with alloy thus always use them. There are very cheap alloy lock nuts available and always have some on hand if anyone needs them.
This is very similar to the request for alloy motor heat sinks. They are added weight and serve to maintain the stock motor and agree these should be permitted. Please note, this is limited to motor spacers/heat sinks, not motor pods because they may include heat sinks as part of the kit.

LM is a matter of choice. It comes as standard equipment on a 'stock' LM kit. if driver X feels this is what they need to compete, the choice is there to switch to LM autoscale of choice. There are near endless choices to be made in terms of which chassis and autoscale to choose in the end, each based on driver X criteria. I see this as one of the many strengths of stock class vs. a fault. I do see the merit in the discussion though and will discuss it further this saturday. If i recall correctly, even the kyosho mini-z cup permitted the stock spring damper shock on chassis that did not include it.

If anyone is ever in need of a part for stock class and is not comfortable paying for Kyosho parts, please inquire with me. I am more than happy to assist and typically have extra's of just about everything on hand.

I'm currently working on a new member parts kit as we speak that will include bearings, ample supply of lock nuts, proper box wrench, Philips screw driver for about $15. I already dispensed to HW a large quantity of battery cases to be distributed to new members.

Last edited by arch2b; 2015.01.06 at 02:13 PM.
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Old 2011.07.21, 08:17 PM   #3
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anyone else got a stock car and interested? courtney said he had a couple people waiting for this class so attendance should pick back up.
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Old 2011.08.13, 08:36 PM   #4
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i think it was a good first race today with the bumpy condition of the track, LM models seem to handle best. i've already ordered the R390 autoscale and 30/20 tires. i'll move the HSV to my HFAY chassis as i do like this body.

bill did fantastic with his stock Mazda LM! nearly as good as he did with his HFAY car.

does courtney have a stock lm differential in stock? forgot my chassis kit came with the lm ball diff, not a geared diff.

Last edited by arch2b; 2011.08.13 at 10:11 PM.
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Old 2012.07.19, 08:20 PM   #5
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trying to get this going again, maybe at Mimi's since HW doesn't seem interested in pushing this.
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Old 2012.07.23, 03:24 AM   #6
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i've always loved this class (because it's cheap and fun)... wishing you well and hope this class can bring in more racers...
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