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Dirt Bike Mods & Maintenance
Question for the experts…Modifying the Shift Star
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[QUOTE="bscottr, post: 273629, member: 24946"] [b]It Works....[/b] Thanks to Eric I'm up and running again. If you want a broad power band, I highly recommend Eric's Mo Better porting and mine's on a 265 kit. :aj: Anyway, back to the issue, here's what I found. The points on the shift star for neutral are actually slightly shorter than the other points (.03). I believe it's the shape of the neutral points that makes them appear taller. As I said in my original post I (actually a buddy) polished the contacting points of the shift drum, shift forks, the shift star and the mating surfaces of the shift pawl and shift shaft. This made the shifts of 2nd through 5th very, very smooth. It’s not at all hard to do, you just need a polishing wheel on a bench grinder. However, I don’t believe it helped much with the hitting neutral problem. The fix for hitting neutral is with the shift star. Looking at the “ramps” for neutral on the star that the wheel follows, you’ll see that they are very steep, more so than the ramps for the other gears. That’s the problem. Changing the shape of the neutral ramps to closely match the shapes of the other ramps is what we did. This does require that the height of the neutral points be decreased slightly. Again, this is not hard. For a great description and pictures of the process follow the link in azcourt’s post above or follow this: [url]http://www.thumpertalk.com/bike/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=10&t=002432&p=[/url] This is almost exactly what I did, except I didn’t remove quite as much material as he did. I will say that finding neutral now requires smoother (slower) movement of my left foot. However, it’s not hard to find. All shifts are now silky smooth and shifts from 1st to 2nd and 2nd to 1st are the way they should be. :cool: Hopefully this will help anyone with the same problem I had. AZCOURT, thanks a ton for posting that link, it made a world of difference.:D Scott [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Question for the experts…Modifying the Shift Star
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