pabansheematt Posted December 7, 2008 Report Share Posted December 7, 2008 Motors coming apart so I was wondering what is the better upgrade. TZ bearing or the straight gears. I've been told the gears take alot of pressure of the crank bearing. Let me know what you think. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted December 8, 2008 Report Share Posted December 8, 2008 I would think they take a lot of lateral (pulling on the end of the crank) force off. You still have a high hp motor trying to force the gears appart during hard launches. I would go with a tz berring if your only doing one. Might as well put a max load on the stator side of the crank while your in there. josh Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted December 8, 2008 Report Share Posted December 8, 2008 straight cuts. if you take the pressure off the bearing it becomes less of an issue. if i had to pick one and only one itd be straight cuts. i have both in my 10mm cub. Quote Link to comment Share on other sites More sharing options...
FireHead Posted December 8, 2008 Report Share Posted December 8, 2008 If cash isn't an issue, do both. Otherwise the TZ and max load bearing is good enough. :geek: Quote Link to comment Share on other sites More sharing options...
4stroker Posted December 8, 2008 Report Share Posted December 8, 2008 when you say TZ bearing, is it a genuine yamaha part? and is it only available for the PTO side? thanks, mark Quote Link to comment Share on other sites More sharing options...
grpark20 Posted December 8, 2008 Report Share Posted December 8, 2008 I would think they take a lot of lateral (pulling on the end of the crank) force off. You still have a high hp motor trying to force the gears appart during hard launches. I would go with a tz berring if your only doing one. Might as well put a max load on the stator side of the crank while your in there. josh Would it be beneficial to put a tz bearing on both sides or is it just too much over kill? Quote Link to comment Share on other sites More sharing options...
shanYE west Posted December 8, 2008 Report Share Posted December 8, 2008 straight cuts. if you take the pressure off the bearing it becomes less of an issue. if i had to pick one and only one itd be straight cuts. i have both in my 10mm cub. what this guy said! Quote Link to comment Share on other sites More sharing options...
No Limit Powersports Posted December 8, 2008 Report Share Posted December 8, 2008 I would not do a tz bearing without straight cuts. The tz bearing is a needle type bearing and is not made to take any side load like the ball bearing style max load. With the helical cut drive gears there is going to be some side load which is not good for the tz bearing. The tz is a great bearing but i wouldnt recommend using it without the straight cuts. Quote Link to comment Share on other sites More sharing options...
pabansheematt Posted December 8, 2008 Author Report Share Posted December 8, 2008 Motors coming apart so I was wondering what is the better upgrade. TZ bearing or the straight gears. I've been told the gears take alot of pressure of the crank bearing. Let me know what you think. Thanks for the advice guys. I was just being lazy and did'nt want to split the cases. Anyway I decided to do both. I have to much invested to be lazy. A friend of mine has a 400 cheetah a blew 2 right side crank bearings in 2 years. So that got me a little worried. I'll just do it right before somthing blows. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted December 8, 2008 Report Share Posted December 8, 2008 (edited) I guess I'm a lucky one.... I've had a TZ on my PTO side for 2 years and literally hundreds and hundreds of passes without a single issue...on my 1996 stock helical gears. Straight cuts are a waste of money on smaller motors, unless you're running pavement, hitting N20 or you need to alter your gearing ratio for 1/4 mile runs without running a HUGE front sprocket. No one really carries the Yamaha OEM TZ bearing anymore. People buy the NTN bearing and have the race machined for the clip on the PTO side... It's what I have in mine. I still have an OEM on my flywheel side. Edited December 8, 2008 by dajogejr Quote Link to comment Share on other sites More sharing options...
FireHead Posted December 18, 2008 Report Share Posted December 18, 2008 I guess I'm a lucky one.... I've had a TZ on my PTO side for 2 years and literally hundreds and hundreds of passes without a single issue...on my 1996 stock helical gears. Straight cuts are a waste of money on smaller motors, unless you're running pavement, hitting N20 or you need to alter your gearing ratio for 1/4 mile runs without running a HUGE front sprocket. No one really carries the Yamaha OEM TZ bearing anymore. People buy the NTN bearing and have the race machined for the clip on the PTO side... It's what I have in mine. I still have an OEM on my flywheel side. Dave actually shares my base blanket opinion on this subject. The only other reason to run the straight cuts is if you want to change your primary gear ratio, then a straight cut hear is easier to manufacture. :geek: Quote Link to comment Share on other sites More sharing options...
BellicoseBanshee Posted December 18, 2008 Report Share Posted December 18, 2008 I've had a TZ on my PTO side for 2 years and literally hundreds and hundreds of passes without a single issue...on my 1996 stock helical gears. Straight cuts are a waste of money on smaller motors, unless you're running pavement, hitting N20 or you need to alter your gearing ratio for 1/4 mile runs without running a HUGE front sprocket. No one really carries the Yamaha OEM TZ bearing anymore. People buy the NTN bearing and have the race machined for the clip on the PTO side... It's what I have in mine. I still have an OEM on my flywheel side. I really debated a long time (well, about ten days anyway) about purchasing straight cut gears. I have much faith in what you and Firehead are saying, but much like Matt, I did not want to take a chance wrecking an engine that I thinks runs very well for one built by someone who does this as a hobby. If cash isn't an issue, do both. Otherwise the TZ and max load bearing is good enough. :geek: It is funny, I took this advice before you posted #11 above. :biggrin: Just ordered them... Quote Link to comment Share on other sites More sharing options...
BellicoseBanshee Posted December 18, 2008 Report Share Posted December 18, 2008 Thanks for the advice guys. I was just being lazy and did'nt want to split the cases. Anyway I decided todo both. I have to much invested to be lazy. A friend of mine has a 400 cheetah a blew 2 right side crank bearings in 2 years. So that got me a little worried. I'll just do it right before somthing blows. Are you adding the gears to your existing basket? I decided to throw down for the Hinson spring tension basket with the straight-cut gears... Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted December 18, 2008 Report Share Posted December 18, 2008 Are you adding the gears to your existing basket? I decided to throw down for the Hinson spring tension basket with the straight-cut gears... damn baller!!! Quote Link to comment Share on other sites More sharing options...
dajogejr Posted December 18, 2008 Report Share Posted December 18, 2008 Bellicose...I don't blame you. The thought of pissing away thousands to save a few hundred has never sit well with me either. I've been lucky on my last two cub motors to have a good friend help me, and he's done quite a few of them. I put my faith in him when he said straight cuts weren't needed...throw a good PTO bearing on there, and you're fine. 2 years and a LOT of runs later, he hit the mark with me. I would LOVE to have a spring loaded hinson and straight cuts. Now that I'm gonna spray it with 30 some time this year....that might be one of the next things on the list.... That setup is very nice...enjoy!! Quote Link to comment Share on other sites More sharing options...
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