Setups
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Gearing
Stock gearing for the Yokomo YZ-4 SF2, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 16T | 5.00 | 12.50 |
| 17T | 4.71 | 11.76 |
| 18T | 4.44 | 11.11 |
| 19T | 4.21 | 10.53 |
| 20T | 4.00 | 10.00 |
| 21T | 3.81 | 9.52 |
| 22T | 3.64 | 9.09 |
| 23T | 3.48 | 8.70 |
| 24T | 3.33 | 8.33 |
| 25T | 3.20 | 8.00 |
| 26T | 3.08 | 7.69 |
| 27T | 2.96 | 7.41 |
| 28T | 2.86 | 7.14 |
Shaded rows are the pinions most 1/10 4WD buggy setups run on the stock spur.
What pinion should I run?
Tell us your motor and track and get a starting pinion for the Yokomo YZ-4 SF2, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the Yokomo YZ-4 SF2?
It depends on your motor and the track. In the 1/10 4WD buggy class, racers gear by final drive ratio: 6T and below near 10.66, 7.5–8.5T near 10.00, 13.5T near 7.95. On the YZ-4 SF2's stock 80T spur that is about 19T for 6T and below, 20T for 7.5–8.5T, 25T for 13.5T. Tight tracks gear down, open tracks gear up. For a starting pinion matched to your motor, use the So Dialed Pinion Recommender with the YZ-4 SF2 selected.
What is the internal ratio (transmission ratio) of the Yokomo YZ-4 SF2?
The YZ-4 SF2 has an internal ratio of 2.5:1. Final drive ratio = spur ÷ pinion × 2.5. With the stock 80T spur, a 16T pinion gives an FDR of 12.50 and a 28T gives 7.14.
How many teeth is the stock spur gear on the Yokomo YZ-4 SF2?
80 teeth. Changing the spur moves every pinion's ratio at once; most racers leave the spur and tune with the pinion.
Kit setup
Kit shock setup. Part numbers link to AMain.
- Front
- 650 cst
- Rear
- 550 cst
- Front
- YA Purple (#YOKYAS-650) - stiffest YA
- Rear
- YA Black #YOKYAS-1000 →
- Front
- 10,000 cst
- Rear
- 10,000 cst
What shock oil does the Yokomo YZ-4 SF2 come with?
Out of the box the YZ-4 SF2 runs 650 cst front, 550 cst rear (Yokomo oil), on 2 x 1.6mm, 2.0mm thick black (#S162) front, 2 x 1.8mm, 2.0mm thick black (#S182) rear pistons. That is the kit setup; you will need to adjust it for your track conditions. The RC Setup App can help dial it in.
What springs does the Yokomo YZ-4 SF2 come with?
The kit springs are YA Purple (#YOKYAS-650) - stiffest YA front, YA Black (#YOKYAS-1000) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
What diff fluid does the Yokomo YZ-4 SF2 come with?
The kit diff fluid is 10,000 cst front, 10,000 cst rear. Thicker front adds steering on power; thicker center sends more drive rearward; thicker rear stabilizes the car under throttle.
Setup Help
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