The 1835 Hapi on my KR had a 4 hole aluminum flywheel, and it too was 
very  close to failing when I discovered it while changing out the 
alternator which had gone TU.
Question,,why is TU considered a bad thing? I always thought it was a 
good thing...

Mark Langford wrote:
> And if it has an aluminum flywheel, check out the two photos at 
> http://www.krnet.org/misc/HAPI_flywheel/050917111m2.jpg and 
> http://www.krnet.org/misc/HAPI_flywheel/050917111m.jpg  .  This was on Jim 
> Hill's HAPI engine, and it appears to be a matter of seconds away from 
> coming apart.  Steve at Great Plains also has a cure for this, I believe. 
> What made it obvious was loaded of end play on the crankshaft...the prop 
> would move fore and aft an eighth of an inch or so, rather than the .004" or 
> so it's supposed to be.
>
> Mark Langford
> N56ML "at" hiwaay.net
> website at http://www.N56ML.com
> --------------------------------------------------------
>
>
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