mandatory carb inspection or overhaul?

by russell messenger in General Tech Discussion 12 years ago

question for roger or any qualified rotax mech. rotax recommends carb removal, disassembly and inspection. it does not specify which, if any parts are to be repalced, unless they show signs of wear. I have a 30,000.00 dollar 914 and wonder why an engine that expensive would need a carb repair at 200 hrs. roger with your experience in carb overhauls, what are you seeing at 200, 400, 600 hr interval repairs? is there any consistency in wear patterns? would you predict any particular component failures at any given interval? again, 200 hrs does not seem very long. thanks RLM

Re: mandatory carb inspection or overhaul?

by MARK JACKSON » 12 years ago

MARK JACKSON

12 332 11

Hi Russell

Vibration plays a big part in carb parts wearing. The main parts that need checking are the needles where they are retained by the clip. If the needle spins in the clip, the clip can cut into the needle and eventually cut it in half.

The float hinges can wear where the hinge pin goes through the hinge. These can wear through allowing the float hinge to fall off.

The needle can wear the needle jet if the engine vibration is high, causing improper fuelling.

The floats can disintegrate and large flakes of float material can block the main jet causing big problems.

Depending on age and usage, the o rings can fail if they are allowed to perish.

The springs on the choke and throttle can also wear through.

Apart from that that they seem to be OK. :(

Mark

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