answ3r Posted February 19, 2012 Report Share Posted February 19, 2012 If these gears get hot enough that you can't hold them, the temper probably gone... If the gear doesn't show any colouring, you're ok. It starts to get yellow at 390F. http://www.smex.net.au/Reference/SteelColours.htm Quote Link to comment Share on other sites More sharing options...
blowit Posted February 19, 2012 Report Share Posted February 19, 2012 Just to offer consideration for cutting gears and the respect to heat treatments, what has to be considered is both the temperature in the cut (not overall temp) and the fact that these gears will have a majority "case harden" on them for structural reasons. The temperatures in a cut regardless if using coolant can well reach outside the annealing and tempering temperatures of steel. It would be unlikely that the entire gear would reach a critical temp but anything you cut almost certainly would have lost some hardness, mostly because the gears are either carburized or induction hardened at only case thicknesses. Case thickness will usually be measured in thousandths of an inch so it does not take much to breach the "crispy crust" Gears are VERY picky about material condition. Most are through treated to bring the metal to a specific hardness and strength, are tempered to further improve the "toughness", then cased to further increase the hardness of the surface layer to increase wear resistance. Any time you cut on a gear, you should really consider a full retreatment of the gear. I understand that does not always happen but something to consider I guess. Brandon Mull Engineering Quote Link to comment Share on other sites More sharing options...
sheerider1026 Posted February 19, 2012 Report Share Posted February 19, 2012 are the points where cutting is done really a place on the gear that excessive load is being placed? i wouldnt think so.. when overides are cut, are they retreated?? i somehow doubt it.. i have not seen a transmission yet fail from being cut on.. sure it can happen, but i havnt seen it yet Quote Link to comment Share on other sites More sharing options...
sprinklerman Posted February 19, 2012 Report Share Posted February 19, 2012 Not a opinion...a FACT I have cut three overrides that i did NOT cut these splines out and it shift perfectly fine...i think cuttting these out causes the dogs to SLAM into the splines harder and causing the dogs to break off...as long as the drum is cut right and dogs cut on a 45 degree it WILL shift fine.....HBT ! Why would cutting the dogs out cuase them to slam "harder"? The involved parts will be spinning at the same speeds (cut or uncut) regardless.... Quote Link to comment Share on other sites More sharing options...
blowit Posted February 20, 2012 Report Share Posted February 20, 2012 are the points where cutting is done really a place on the gear that excessive load is being placed? i wouldnt think so.. when overides are cut, are they retreated?? i somehow doubt it.. i have not seen a transmission yet fail from being cut on.. sure it can happen, but i havnt seen it yet What I mention above is that you would NOT be losing strength or toughness of the gear but you would be losing wear resistance due to the loss of the case surface layer. We ran some tests a while back on Banshee trans gears and their case was as expected, I think .010" or so. Quote Link to comment Share on other sites More sharing options...
sheerider1026 Posted February 20, 2012 Report Share Posted February 20, 2012 What I mention above is that you would NOT be losing strength or toughness of the gear but you would be losing wear resistance due to the loss of the case surface layer. We ran some tests a while back on Banshee trans gears and their case was as expected, I think .010" or so. i gotcha.. i wasnt doubting your post.. just curious as to people claiming this isnt something a person can do themselves and not have problems.. good info though Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted February 8, 2017 Author Report Share Posted February 8, 2017 (edited) Hey I remember this Edited February 8, 2017 by SlowMoe Quote Link to comment Share on other sites More sharing options...
bigweav81 Posted February 9, 2017 Report Share Posted February 9, 2017 ........so how does it shift? Sent from my SM-S820L using Tapatalk Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted February 9, 2017 Author Report Share Posted February 9, 2017 I sold the bike but it cut down on the misses shifts massively Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted February 9, 2017 Author Report Share Posted February 9, 2017 I miss that thing. It had Paul turner hi-revs and pulled forever. Didn't even do much exhaust port work at all either Quote Link to comment Share on other sites More sharing options...
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