Speed shops are reporting the new Polaris 600 H.O. is indeed a very strong engine package, but that the engine requires a hot pipe to make full power and that the little mill is somewhat sensitive to the exact jetting. This engine varies ignition timing and power valve opening and is fitted with a detonation sensor, but it has no form of fuel delivery compensation or float bowl pressure control.
No surprise here, but with the automatic fuel delivery compensation systems of the others in this class, the need to be changing jetting is an area that can be improved upon for more accurate fuel delivery (and economy).
We do have options. The Holtzman ATACC float bowl pressure compensator system is being installed into these units by some of the speed shops to get the jetting more accurate. The ATACC automatically reduces the float bowl pressure as the temperature or elevation changes (similar to the Ski-Doo DPM), so the jetting and fuel delivery is more consistent with the engineâ€™s requirements and the power delivery remains more consistent. If you experience flat performance due to jetting, consider one of these auto-compensation units from Holtzman Engineering (715-479-8727) to make it work even better as conditions vary.