Machines
Tuning
How the parts work, and why a setup is the way it is. Every article states what its claims rest on: a general principle, a rulebook, a supplier's own published guide, or a named racer who has run it. Nothing here is a number somebody guessed.
By subject
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mixes fuel and air
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makes the spark that fires it
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burns the charge and turns the drive shaft
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carries the burnt gas away
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turned by the shaft, it throws water back
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a jet of water out the back, which drives the craft
Two things go into the engine, and its work leaves by two routes: gas out through the exhaust, and turning force down the shaft to the pump.
How we know: the carburettor, spark and exhaust are as US patent 5,370,088 describes a two-stroke (paragraphs 5, 8 and 9); the shaft from engine to pump and the water thrown out of the stern are US patent 8,905,800 (paragraphs 5 and 6), and the craft moving as the reaction is US patent 6,705,908 (paragraph 3).
Not to scale.
Which of these do you want?
| Page | Answers | Rests on | Size and certainty |
|---|---|---|---|
| By symptom | What the ski is doing wrong, rather than what the part is called. | The same articles, indexed by the fault a rider turns up with. | 33 symptoms across 12 articles. |
| Spec tables | The numbers: clearances, torques, jetting, in one place. | Named documents, and every table says which. No number here is remembered. | 6 tables, 136 rows. |
| What fits more than one machine | Where one part number is listed against several skis. | The manufacturers' own application lists, not our inference. | Every shared row in the spec tables, grouped by part. |
| What is legal, in plain words | What a class means at a tech inspection, argued instead of tabulated. | The class records under Class Legality, read back as prose. Where an article and the class record differ, the record is right. | 3 articles, each naming the class it explains. |
This is explanation, not instruction. Check anything here against your own manual and your own machine before you act on it.
12 articles · 6 spec tables · 33 symptoms