Rotax has a description of this. What I understand is that the new
flywheel has the timing lobes changed so when STARTER ENGAGES ignition
takes place a few degrees AFTER TDC, not before, as with the old flywheel.
I have both a new set of Rotax soft start CDI modules and the original CDI
units. Never tried either with the old flywheel as I was advised by Rotax
that mounting a new flywheel would be far be the most effective and cost
effective solution. So, with the old CDI I noticed it starts a slight bit
rougher but not much. With the new soft start CDI its quite smooth. I
think the biggest difference, though, was to go for the lithium battery.
Not only saving 12 lbs up front on the foot well but much more consistent
and higher voltage during cranking stage. The smaller starter cranks like
crazy. Worked for me, even in the Canadian winter last year.
I think the flywheel makes sense and exchange is about 1 hour when the
engine is out.
Christoph
On 2014-10-08, 8:26 AM, "David Watts" <dg.watts@talktalk.net> wrote:
>
>Hi Christoph,
>
>So what is the difference between the new and old flywheel?
>
>David Watts G-BXDY
>
>
>> On 8 Oct 2014, at 11:23, Christoph Both <christoph.both@acadiau.ca>
>>wrote:
>>
>><christoph.both@acadiau.ca>
>>
>> The small starter works fine with the new flywheel and a lithium
>>battery on the 912 ULS with the classic engine pint. Flywheel is only
>>$350. 150 hours and no problems or kickbacks.
>> Christoph
>> #223 Classic
>> Wolfville Nova Scotia Canada
>>
>> Sent from my iPhone
>>
>>> On Oct 7, 2014, at 22:14, "Troy Maynor" <wingnut54@charter.net> wrote:
>>>
>>><wingnut54@charter.net>
>>>
>>> Hi,
>>> I second what Dave says about the starter. The heavy duty one that now
>>>comes on the 912S hits the classic fwf mount.
>>> An alternative to the soft start system that has worked fine for me
>>>for 4 years is to wire the ACS start switch that I installed to where
>>>when you turn it to the "Start" position one mag is grounded allowing
>>>the engine to only start on one mag. The instant you release the switch
>>>both mags are on line. I've never had any kick back with the small
>>>starter and a 4 year old battery. Thinking I may change the battery
>>>this year even though it still spins up the engine fine. It's the
>>>Odyssey 680 I believe.
>>> FWIW
>>> Troy Maynor
>>> UK120
>>> 250 hours (slow year)
>>>
>>>
>>>
>>>
>>> Read this topic online here:
>>>
>>> http://forums.matronics.com/viewtopic.php?p=431636#431636
>>
>>
>>
>>
>>
>
>
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