SlowMoe Posted February 22, 2011 Report Share Posted February 22, 2011 (edited) Alrighty! Just wrapped up the tranny mod on my bike s I figured I'd share the experience with everyone. Ok if you're not familiar with this mod its purpose is to reduce the amount of missed shifts when shifting under power. I can't comment on its effectiveness but everyone who has had it done seems to think its very worthwhile. I'm sure everyone does it a little different, but this is how I did it: First you will need: Digital camera Paint marker Rotary tool with some inch and a half or smaller cut off wheels Snap ring pliers Protective eyewear (Hopefully nicer than mine) Also leather gloves will come in handy when the part heats up. Don't forget a bucket of soapy water to rinse the gears off in after you cut. Edited February 22, 2011 by SlowMoe Quote Link to comment Share on other sites More sharing options...
sstaton1983 Posted February 23, 2011 Report Share Posted February 23, 2011 ok,i get what tools to use.but what are you cutting? Quote Link to comment Share on other sites More sharing options...
bbcmudtruck Posted February 23, 2011 Report Share Posted February 23, 2011 Hahaha, Sweet. Quote Link to comment Share on other sites More sharing options...
sstaton1983 Posted February 23, 2011 Report Share Posted February 23, 2011 i should have read the other post first,now it all makes since.lol i have my cases split so im gonna try it tomorow. Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted February 23, 2011 Author Report Share Posted February 23, 2011 (edited) Ok obviously first of all you need to remove the engine from the frame, tear the engine completely apart, remove both rows of gears from the cases and take off the bearings seals and stuff. Now you need to dedicate one area to tearing down and storing your row of gears and another to grinding, to minimize contaminating your parts with shavings and such Ok, first thing I do is take a bunch of pictures of both sets of gears from different angles, in case you forget how everything goes. Next, take your first rack and set it in front of you as shown; take your paint marker and leave a marking on each gear on the right hand side, and on the end of the shaft. This will help you to know which way the gears go on the shaft if somehow you are lost and the pics don't help. Be sure to wipe the oil off the gear before marking Next you pull the row of gears apart. What I like to do as I go is to slide the part (gear, washer snap ring) off and lay the right hand side of the part down on the table, so that when I put everything back together everything is exactly the same as before I took it apart. Start lining up your parts in order from the right to the left so that you know exactly what order to put it back together in. BE EXTRA CAREFUL because there are little thin washers that stay stuck to the gears and can fall on the ground and eventually be left out. Look at each side of each component good as they come out to make sure there isn't a washer stuck to it. Now that you are at this point, you know that everything goes back on the shaft from left to right, and that the side facing up goes on the shaft first. Be sure to take pics of everything lined up like this. Now, what we will do here is take every gear that has 6 cogs and remove every other one, leaving 3. Gears with 3 cogs will not be touched. Before After If a gear only has 3 dogs, leave it alone So on this first rack, there will be 2 gears total that you will be grinding on. The first one I grab is the one to the left. I begin by chopping off the protruding chunk of cog as shown in the photo. Use the least amount of pressure that your patience will allow you to keep from heating the gear too much. Be patient and pay attention to what you're doing so you only cut the cog you are working on. Once you have lopped off the big piece, skip a cog and cut off your next one. The reason I don't completely remove a cog at a time is I don't want to localize the heat too much. Now after you do all 3 you should be left with something similar to this: Now once you have the big cuts done go ahead and feather out the remainder of the cogs until you're left with this: Once you've completely removed all 3 dogs from the gear, go ahead and wash it real good in soapy water and wipe off all the trash and shavings. Put it back where it was in the lineup and do the other one. Once you're done with that one reasemble the row of gears and do the next row using the same steps outlined here. I believe the other row has 4 gears total that need grinding. It will take you 15-25 minutes per gear so be patient and PAY ATTENTION to what you're doing. It can get monotonous and you don't to veer off and cut a good cog all to heck. If you do cut somewhere not intended I suggest you blend the the nik into the parent metal at a 3:1 taper to eliminate any stress risers. Make sure your area used for cutting is well lit. I believe that's about it. Make sure you wear your safety glasses because 30,000 RPM + shrapnel can be bad news for your eye. A face shield would probably be a good idea as well. Edited February 23, 2011 by SlowMoe Quote Link to comment Share on other sites More sharing options...
bansheesrtoys Posted February 23, 2011 Report Share Posted February 23, 2011 nice write up. but i was always told that you have replace the snapp-rings once removed. and not to re-use them at all. Quote Link to comment Share on other sites More sharing options...
sheerider1026 Posted February 23, 2011 Report Share Posted February 23, 2011 i reused mine... no problems Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted February 23, 2011 Author Report Share Posted February 23, 2011 (edited) Well in my opinion, you can warp a new snap ring while putting in just as easy as you can taking the old one out and putting it back in. Unless there is some other factor I'm ignoring.. Edited February 23, 2011 by SlowMoe Quote Link to comment Share on other sites More sharing options...
bansheesrtoys Posted February 23, 2011 Report Share Posted February 23, 2011 i never understood why either. i re-use them on cars all the time. but in my clymer and the first/last time i let a shop do my motor they replaced all of mine, and said i had to anytime they are removed. but if you guys are re-useing them hell so will i. Quote Link to comment Share on other sites More sharing options...
tedd1 Posted February 23, 2011 Report Share Posted February 23, 2011 If these gears get hot enough that you can't hold them, the temper probably gone... Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted February 23, 2011 Report Share Posted February 23, 2011 OMG you jacked some of those gears up pretty good. Quote Link to comment Share on other sites More sharing options...
400sbc Posted February 23, 2011 Report Share Posted February 23, 2011 and what that does by tering off those cog? can you explain please Quote Link to comment Share on other sites More sharing options...
brodysblanshee Posted February 24, 2011 Report Share Posted February 24, 2011 If these gears get hot enough that you can't hold them, the temper probably gone... How hot do they get when drag racing on a summer day in Texas? Idk, but probably hotter than what I want to touch... Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted February 24, 2011 Author Report Share Posted February 24, 2011 It increases the chances of the cog of the "male" component landing inbetween the gogs of the gear to be engaged instead of on top of them, which is typically what happens when a shift is missed. And Tedd, you think that 150 degrees f is enough to make a gear lose its tempering? Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted February 24, 2011 Author Report Share Posted February 24, 2011 OMG you jacked some of those gears up pretty good. Luckily for me it isn't on any mating surface and it will be inside the cases where no one will ever see... Quote Link to comment Share on other sites More sharing options...
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