Inherited Chinese ATV

Not the gear but the shaft (2.75" long) that holds the gears in place. The shaft has a pin that sits in a slot in the case. The pin broke allowing the shaft to spin out of place jamming the gears. The gears look to be in good shape, however I need to replace the shaft. Any ideas on where to order a replacement? I tried to send a pic but am unable.  

parts for these are pretty hard to find. i think wolf1 knows of a website that stocks parts for them but i cant recall the name of it,  
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2005 honda trx450 golden west graphics, hot cam, high compression piston, hmf exhaust, nerf bars,works shocks, golden west seat cover, one industries bars, and more

Thanks for the help,,I found someone to weld a new pin onto the shaft and now the bike starts with little effort and after working on the carb it idles perfectly. My new delema is the clutch. When I hold the clutch and put the bike into gear it leaps like I don't have a clutch. I adjusted it as far as it will go and it  made no difierence. I am preparing to remove the side cover to see what's up and I wanted to ask if anyone knows if there will be any suprises like; springs, washers, ect. that will come flying out once the cover is removed. Also, any tips on the clutch will be a great help. No manual.
To Continue,,,I removed the left hand side engine cover and it was dry. Is this normal or perhaps my problem? I read in another forum that 90 to 250cc chinese bikes are wet clutch systems. If that is true, what weight oil do you use? I know these are pretty lame questions, however I have been trying very hard to get this bike going and I don't want to forget something or make any costly mistakes. Thanks again for the help.  

After pulling the side cover off I found the clutch assembly was extremely dirty and had this gooey stuff all over it. I cleaned it completely and reassembled and now it runs like a top. It's actually pretty fast as well. I have NO experience with other quads but I ran through a couple of good sized mud holes today and the bike didn't bog down or loose power. It kicked right through. It is certainly not a racing machine but it will make a good hunting vehicle. I plan to use it next weekend. It's muzzle-loader season down here in South Florida. If I get a big hog I will be able to see if it will drag it back to the truck. Many thanks to billl2099, Fmxlevi, sw3507 and especially LynnEdwards for your patience and knowledge and advice that helped me get my machine up and hauling ass.