mag drop

by Robert Musgrave in 912 / 914 Technical Questions 11 years ago

I have a bad mag drop on 912ULS, and FAQ suggests using the Ignition Troubleshooting Guide. Trouble is I cannot seem to locate this guide? Where would I find it?
Regards Robert :(

Re: mag drop

by jan kerstens » 11 years ago

jan kerstens

34 131 5

Robert,

Did you clean the carbs recently?

Jan

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Re: mag drop

by Robert Musgrave » 11 years ago

Robert Musgrave

5 3 0

No I haven't but definetly worth considering.
Thanks,
Cheers Robert B)

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Re: mag drop

by Roger Lee » 11 years ago

Roger Lee

125 5.12k 4.53k

Are the A&B ignition drops equal and how big a drop are we talking about and at what rpm is the mag check done?

Mag drops are affected by plug gap (too wide or too narrow), bad connection with the plug boot and ignition wire, grounding issues, thermal paste on the plug electrode, Loose plug, cap not on the plug tip tightly, poor connection up at the ignition modules. The carbs may be involved, but I would check the electrics first. These are the most common and where I would start my inspection.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: mag drop

by jan kerstens » 11 years ago

jan kerstens

34 131 5

Roger is right. Check the ignition system first.

Some time ago I had a bad mag drop when I cleaned the carbs by mild pressurized air and thereby dislodging the membranes in the carbs. Just my 2 cents.

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mag drop

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