Ruff running on one mag(elect module) on my 912s
I have a highlander with a 912s, 500hrs TT.
Started having problem with engine running rough on one mag(module)and on cold start dead on that mag untill abt 3min warm up then works but rough compaired to opposite mag, about 100 rpm def on mag test at 4K.
I have a bully hawk soft start module installed and when disconnected I have the same problem.
Bully hawk people said it might be the module pickup coil is not set right.
Has anyone adjusted these pickups and can give me heads up on difficulty?:confused:
plugs have been gapped and all show good color.
Bob
Mag help and troubleshooting
Hello everyone. First I'm an A&P mechanic with an approved Rotax certification on the 912 series engine. With that being said lets get to the business. Assuming that the problem you gentleman have is with the ignition system here are a couple of possible faulty components and some simple troubleshooting procedures you can use to help diagnose your fault. 1. Let's assume the carbs are both synced properly. 2. Check that all of your ignition cables are securely attached to your spark plug connector. There is a specific pull off force for the spark plug cable cap from the spark plugs. The minimum pull off force is 30N (newtons) or 265in/lbs. 3. If the fault persist your spark plugs maybe be bad or out of tolerance. The minimum gap for new plugs is .6" and max gap of a new plug is .7 new. I try to keep my gap as tight as possible or close to .6" the plugs can wear to .9" and at this point .9" the plugs are toast. 4. Let's get to some tougher stuff. Let say you suspect either an ignition module or an ignition coil. Your solution will be either a $1000 ignition module or a $300 ignition coil. That's a big difference in repair bill if you ask me. So here is a quick tip to determine which part is bad. These engines are redundant so I would swap parts A system to B system. 5. The trigger coils can sometimes be a problem and may also need adjustment. This solution may just be the best and only cost 1 labor hour or two to your favorite A&P or light sport repairmen with a rotax maintenance certification. Additionally the fault everyone is experiencing seems to iminate from an out of tolerance trigger cool. These faults show there symptom such as duff running and larger than normal mag drops 300 +RPM. These are basic trouble shooting technics and I hope they help. If anyone has any specific questions feel free to pm me and I will reply promptly.