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RotaxEngines-List Digest: Hard Starting

 
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mctrader(at)bigpond.net.a
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PostPosted: Tue Mar 07, 2006 1:06 am    Post subject: RotaxEngines-List Digest: Hard Starting Reply with quote

Re Hard Starting -

Over the 11 years and 500 hours I had my Rotax 912, the most I ever got out
of a battery was 2 years. I was using Harley 19 ah mostly, even tried a 30
ah out of the Big Twin model but the 912 just seemed to have an appetite
for batteries.
In contrast, the Odyssey 680 in my Lycoming -powered RV has been flawless
for the past 2 years and 200 hours.

In starting the 912 from cold, it is imperative that the throttle is fully
closed and the 'choke' ( actually a separate starting circuit ) is
activated. This is typical of CV or Constant Velocity-type carbs that don't
have an accelerator pump.
Because the 912 is a fairly cold-blooded beast and runs quite lean, I
sometimes found that it was helpful for starting to unhook the float bowls
with the fuel selector 'on' and let them fill up a bit higher before
clipping them back together. Those that have any experience with the
2-strokes may recall that this, or blowing in the overflow tube to achieve
the same thing, would make a big difference to ease of starting. Definitely
don't do it if the engine is already warm....

Another bit of advise is to make sure that the spark plug gaps are set to
the factory specs. and not a fraction more.

Regarding oils - Mobil One motorcycle oil can be had in both 15W-50 and
20W-50 grades, while the automotive series is much thinner - 5W-30 etc -
definitely not suitable for the 912's gearbox.

FWIW,

Martin in Oz


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