Propeller pitch is chosen so the engine reaches Suzuki's full-throttle operating range with a normal load aboard: too much pitch and the engine lugs below the range and runs hot and hard; too little and it over-revs against the limiter. The ranges below are from Suzuki's owner's manuals; the propeller-hardware rules are from the same source. Compiled by the Boat Max Online service team.
Suzuki full-throttle operating range by model
| Models | Full-throttle range |
|---|---|
| DF2.5 | 5250–5750 rpm |
| DF4A, DF5A, DF6A | DF4A 4000–5000; DF6A 4750–5750 rpm |
| DF8A, DF9.9A | DF8A 4700–5700; DF9.9A 5200–6200 rpm |
| DF9.9B, DF15A, DF20A | DF9.9B 4700–5700; DF15A 5000–6000; DF20A 5300–6300 rpm |
| DF25A, DF30A | DF25A 5000–6000; DF30A 5300–6300 rpm |
| DF40A, DF50A, DF60A, DF50AV, DF60AV | DF40A 5000–6000; DF60A 5300–6300 rpm |
| DF70A, DF75A, DF80A, DF90A, DF100B | DF75A 5000–6000; DF90A 5300–6300 rpm |
| DF100A, DF115A, DF140A | DF100A 5000–6000; DF115A 5000–6000; DF140A 5600–6200 rpm |
| DF115B, DF140B | DF115B 5000–6000; DF140B 5700–6300 rpm |
| DF150A, DF175A, DF200A (and AP) | DF150A 5000–6000; DF175A and DF200A 5500–6100 rpm (the AP manual lists the same two ranges) |
| DF200, DF225, DF250 | DF225 5000–6000; DF250 5500–6100 rpm |
| DF250AP, DF300AP | DF250AP 5500–6100; DF300AP 5700–6300 rpm |
| DF300B, DF325A, DF350A | DF300B/300BMD 5300–6300; DF350A/350AMD 5700–6300 rpm |
Models not in the table (the DF50A, DF100C, DF115BG/140BG, DF325A, the legacy DF150/175 and DF200, and the 2007–2011 DF300) have their range on the specifications page of the owner's manual; we will add them as we verify each manual.
How to use the range
- Load the boat the way you normally run it, run wide open on flat water with the motor trimmed for best speed, and read the tachometer.
- Below the range: drop pitch. Above the range: add pitch. As a working rule, one inch of pitch moves full-throttle rpm by roughly 150–200, so a motor 400 rpm low usually wants two inches less pitch. Confirm on the water.
- Aim for the upper half of the range with a light load, so the engine stays inside the range when the boat is fully loaded.
- Stainless props are stiffer and often gain a little rpm and speed over the same-pitch aluminum prop; treat a stainless swap as a new pitch test.
Suzuki's propeller hardware rules
- Inspect the propeller nut and cotter pin at the 20-hour service and every 100 hours or 12 months.
- Suzuki's procedure ends with inserting and bending a cotter pin; our shop fits a new one every time the propeller is refitted rather than re-bending the old one.
- Grease the propeller shaft at every annual service and check behind the hub for fishing line, which cuts the shaft seal.
- On the dual-prop DF300B/325A/350A, the front propeller nut stopper is inspected on the same schedule as the nut and pin.
Genuine Suzuki props are on the Suzuki propellers page and the nuts, washers, spacers and cotter pins on the propeller hardware page. If you send us your model, boat and current full-throttle rpm, we can suggest a pitch: contact us.
Sources: Suzuki owner's manuals for each model family (specifications and maintenance schedule). The pitch-to-rpm rule of thumb is general propping practice, not a Suzuki figure; always confirm with an on-water test.