Rotax 912 tach reading

[chriscobb1]

Uncle. RPM is OK until the top end where it stops increasing at 4800. 1 wire from Rotax 912 ULS trigger coil goes to ground. The other wire is connected to the EMS white/green wire with no resistor in line. PULS/REV is set to 1.00. Engine type is set to Rotax 912. Tried the white/blue wire and reconfigured the Skyview = no difference. Reinstalled latest software 3.3.2 AND the sensor update from May 2012.

 

[chriscobb1]

Maybe solved. I borrowed a prop tach counter. All RPM's were right on and then I hit 4,800 and no more RPM. Mentor suggested I re-pitch the prop (IVO). I flattened the pitch and I was able to get max RPM.

 

[Roger_Lee]

Hi Chris,

Set the prop pitch on your 912 to get 5500-5600 in flat and level flight WOT at your average altitude. Make sure the carbs are synced and your all set up and ready to go. Sync the carbs at idle and around 3500+ rpm and not the 2500 in the book. It's too low and you won't be synced at the higher rpms. Don't worry about what the static is as it is only to get you in the ballpark to tweak it for the actual in flight settings. The WOT rpm above will get you the best all around performance for a ground adjustable prop.