Johnsinski wrote:
That also led me to the ugly details of how exactly am I going to get reverse in this? I had bought another CBR1000RR starter motor and had determined that the spline on it was actually a mod 1 gear. So I got to looking for a mod 1 spur in a 50 to 60 tooth but they were all pretty expensive and then I had the brilliant idea of just getting the starter shaft from, say, a CBR1000RR! 15 bucks shipped, 60 tooth, score!
My thought was to put a small 8 or 10 tooth sprocket on that shaft and that would give some good low gearing, about 10 MPH max freeload speed as near as I can guess. I tried to spin the starter up to figure out how fast it is, couldn't find my tach, so I tried to slow motion capture it and it seems to be about 7000 RPM at 12v.
I was trying to think of a good, not overly complicated way to engage the sprocket/motor assembly with the chain. Either a straight slide (downish) or rotation would be fine, but I kind of want it to "lock out" like a toggle, so whatever mechanism I use to move it isn't going to see the force (try to disengage) trying to spread the sprocket and chain. (english 101 fail)
The starter motor has another gear between it and the gear you have to reduce speed and provide more torque to turn the cbr1000 over without stalling and overheating the starter. You could use an automotive ring gear removed from a used flywheel or flex plate, to fit your own light ring that bolts to the sprocket but is spaced away an inch or so (depends on the starter nose design you use). The ring gear is heated to slip on then cooled to a interference fit but you can also tack a few spots or drill and add small roll pins along the mating line so it can't slip. Then all you need is a button control versus linkage or cables with springs. Just another consideration. Seat looks great.
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Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS
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