You want the plastic spur anyway.. steelies are loud and chew up a nice pinion.

You might need a non-mugn diff case though. Not sure what's the latest there... but I dont' think the kyosho spur fits a mugen diff.

Not if you have hardened one?

YAY! I have the old 46T Spur in the box so I'll just rebuild the diff and drop to a 12T pinon - Watch this space!

I think even hardened pinions will get chewed... depending on the horsepower and type of abuse dished out, they may last a long time. But they will wear... even the hardened clutch bells wear out in a nitro car. My 8ightT has worn the bell pretty bad in only a handful of race weekends this summer. It's usable still, but not looking good. If mikes' new hardened gears last as long as a clutchbell (a whole season) with a stock steel spur, then that's not bad.

If I had a Mugen I might do that. In fact, there is a new car that I really want to convert and I'm assuming it has Mugen style diffs. If it does, I will probably try the new hardened gears on it so I can just run the stock spur.

Running a plastic spur eliminates this almost entirely though. A cheap steel pinion will last a very long time and a hardened might last a lifetime. And the kysoho spur lasts a long time too, esp considering it's $5

When Chris (Arct1c) first told me about the Mugen mount, I was a little embarassed and confused that it didn't work(thought I had just become an honorary member of the Jacka$$ club), but then I looked at the pictures he sent - looked like a long buggy with a big spur gear. I am glad we figured it out, though - I thought I was gonna have to redesign the mount (I was pretty happy with the design and how they came out).
I made the mount to accomodate my range of hardened pinions (should accomodate a range of about 12-14 pinion options on the stock 46 tooth spur).

And for the record, Dustin - my gears are harder than the average hardened steel clutch bell. Most standard clutch bells use low carbon steel and case harden it - I do this for the emaxx idler gears, which last a very long time. The new hardened pinions have a higher carbon steel and are through hardened - I would be shocked it they didn't last a few seasons to be honest.
The hard case on your average clutch is perhaps .015" - .02" thick. Once this is gone, the wear accelerates quickly, and the deeper into this material you go, the "softer" it is. My new hardened pinion gears are hard all the way through - the wear won't accelerate in time, so they may outlast the spur gear in all reality - especially the larger ones.

Cool... I know there are different grades... just like the stuff that RRP makes, their "extra hard" high carbon gears.

That's what I was going to have made before the shop drove me insane and I gave up on them. I couldn't take it anymore, lol...

Glad you got them Mike.

All fixed! Focussed on completing the X1CR ande getting that out on a test run - Pics will be up shortly on the buggy forum.

Once I rebuilt the diff with the 46T it all went together fine - I eliminated the spacers too so everything that bit lower.

I have a 12T in at the moment but quest for speed my put me back to 16T.

Pics shortly...

Here are the completed pics - Once I got past the user error on the 62T pinion smooth as silk!

Thanks Mike!

http://s168.photobucket.com/albums/u180/Arct1k/Mugen/