Re: Failed response to throttle
by Bob Robertson » one year ago
Berndt,
When was the last time you serviced the carburetors. What you encountered sounds like a flooded carburetor. If you were at an idle the engine is not running smoothly. If your float needles are the least bit dirty, they could possibly not seal completely this causing one (or both) of the carburetors to overfill causing a flooded carb situation. As soon as you touch the throttle the engine would stumble. Noting that the engine cleared up with time is also an indication the issue was intermittent.
My suggestion is to disassemble the carburetors and clean them thoroughly. If the float needles had the old style red/orange rubber tips, the needles should be changed out to the newer ones with the black tips. Any Rotax dealer will know which ones to use.
You should also look at cleaning the air-filter. A dirty filter can cause over-rich operation and have the same symptoms.
Hope this helps
Bob Robertson-Light Engine Services
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