Prop Balance

[Dorsal]

One quick question is does it change much on one ignition or the other?

[Slyfox]

I am going to throw this out here. there is always one side when checking the mags that is always a little rougher.

next, when starting these things if you choke a slightest bit to much, you WILL have a low end roughness. to choke mine I have mags off , pull throttle all the way off, with choke on crank for a count of 3 or 3 cycles, can here it (compression) . I than stop release choke, turn on mags, start engine. after start up I go to 3000 rpm. the rotax manual actually says to run at High rpm until it smooths out. I generally keep it above 2500 all the way out to the runway. After my flight and land, the low rpm is nice and smooth.

Now with that said, I have choked it just a little to much, like count of six, that thing will not run at low idle for nothing. At least until I pull the plugs and clean them, than It's back to normal.

these engine hate too much fuel. I've flown behind the ul and uls for 1800 hours now, rich starts always affects the low end.

[68niou1]

I am going to throw this out here. there is always one side when checking the mags that is always a little rougher.

next, when starting these things if you choke a slightest bit to much, you WILL have a low end roughness. to choke mine I have mags off , pull throttle all the way off, with choke on crank for a count of 3 or 3 cycles, can here it (compression) . I than stop release choke, turn on mags, start engine. after start up I go to 3000 rpm. the rotax manual actually says to run at High rpm until it smooths out. I generally keep it above 2500 all the way out to the runway. After my flight and land, the low rpm is nice and smooth.

Now with that said, I have choked it just a little to much, like count of six, that thing will not run at low idle for nothing. At least until I pull the plugs and clean them, than It's back to normal.

these engine hate too much fuel. I've flown behind the ul and uls for 1800 hours now, rich starts always affects the low end.

Slyfox I need you to stop by and listen to it. Brendon is right behind me and I have listened to his- Chad's and Kelly's, none of them sound like mine. Let me know when you are available-

[Slyfox]

are you back out at felts? what times are you generally there? You can also take the plugs out and look at them. chances are the front plugs I believe might be black, that's not good. although it can be normall, for these generally are darker than the others. If need be I have a spark plug cleaner. quick clean and back in. Do you have a key switch for mags, or flip switches. I have flip switches and I feel that's the only way to go on the 912.

The other day when doing a check over, I found my cable slipped out at the carb for the choke, that can kick the choke on just a little. the fix is to put a wire from the carb to the wire to keep it in place.

[Slyfox]

One more thing, if you choose to be able to crank the motor with the mags off, you should be able to install a starter button seperate from your keyed mags switch, that is if you have a keyed switch for everything. I have a starter button on my rv. makes for bring up oil pressure with the mags off, very usefull.

[68niou1]

Well Slyfox came over and listened to it- he found one of my chokes slightly open, cleaned the plugs and tried again- same issue as before. So now he has loaned me a prop to try- and the warp drive tool to check mine. Thanks Slyfox!! I will try to get to it on Monday- will update the results.

[DesertFox4]

Well Slyfox came over and listened to it- he found one of my chokes slightly open, cleaned the plugs and tried again- same issue as before. So now he has loaned me a prop to try- and the warp drive tool to check mine. Thanks Slyfox!!

Steve's a good man.

Hope you get to the bottom of this problem.



I agree on the ignition switches and start button. Love that setup.

[68niou1]

One quick question is does it change much on one ignition or the other?

Does not change on either side. Both ignitions are within 50 rpm of each other at drop- and I do not use the choke to start it.