Hi Dan,
yes I've replaced the starter drive adapter that broke the spring when the engine kickbacked.
The engine had to come out of the engine mount and move up and forward.  This meant the exhaust all had to come off and all associated cables such as throttle, prop etc. etc..
The best source I found was Niagara Air Parts.
good luck
Charlie K.  See me on the period Web at  www.Lancair-IV.com.


--- On Tue, 11/25/08, Dan Reagan <dreagan@fuse.net> wrote:

> From: Dan Reagan <dreagan@fuse.net>
> Subject: [LML] Starter adapter drive
> To: lml@lancaironline.net
> Date: Tuesday, November 25, 2008, 8:00 AM
> Has anyone ever replaced a starter adapter drive on a
> TSIO550? (this has the turbo scavenger pump on the back of
> it)
>
> I currently have the problem of the starter motor running
> but the prop not turning past a compression stroke.  I am
> told that the whole assembly has to come off the back of the
> engine and the shaft and spring replaced or rebuilt.  The
> problem I have on the IV is the distance from the back of
> the shaft to the firewall is only 2 or 3 inches.  I
> don't think this is enough room to slide the assembly
> out.  Will the engine have to be moved forward to remove
> this assembly?
>
> Any help would be greatly appreciated.
>
> Dan Reagan
> Lancair IVP 570 hours