jimbob Posted December 22, 2008 Report Posted December 22, 2008 BUT....whats the differnece between normal primary drive gear and straight cut drive gear? besides the obvious, one being straight and one not. Quote
BellicoseBanshee Posted December 22, 2008 Report Posted December 22, 2008 Straight-cut gears relieve the axial load on the crank bearing. If you have a TZ bearing, it is a good idea to run striaght-cut gears, for a TZ is not really designed for axial load as it is a needle bearing (supports radial loads) as apposed to a ball bearing (supports radial and axial loads). I have a TZ bearing in my cub, so I opted to install straight-cut gears. The thought of grenading a well-running engine just to save a few hundred dollars was not an option for me. Straight-cut gears come in different ratios as well, which is nice for those wanting to change the primary gearing for different applications such as asphalt racing... Quote
jimbob Posted December 22, 2008 Author Report Posted December 22, 2008 Straight-cut gears relieve the axial load on the crank bearing. If you have a TZ bearing, it is a good idea to run striaght-cut gears, for a TZ is not really designed for axial load as it is a needle bearing (supports radial loads) as apposed to a ball bearing (supports radial and axial loads). I have a TZ bearing in my cub, so I opted to install straight-cut gears. The thought of grenading a well-running engine just to save a few hundred dollars was not an option for me. Straight-cut gears come in different ratios as well, which is nice for those wanting to change the primary gearing for different applications such as asphalt racing... oh riiiight. cool thanks for clearing that up. so what would be the benefit/reason for changing up or down on the primary ratio? Quote
AKheathen Posted December 22, 2008 Report Posted December 22, 2008 oh riiiight. cool thanks for clearing that up. so what would be the benefit/reason for changing up or down on the primary ratio? if you gear down the primary, it lowers the rotational mass in the tranny, and allows you to run a smaller sprokett on the rear and slow the chain down. gearing up can allw for smaller tires like street radials to be geared really high without going extreme on the sproketts. i really have nothing to do with drag or dune, so i can't say there. if i am wrong in any way, i anticipate someone to chime in soon :biggrin: Quote
jimbob Posted December 22, 2008 Author Report Posted December 22, 2008 thats ok man thatll do nicely i was just curious thats all. lol. :thumbsup: Quote
AKheathen Posted December 22, 2008 Report Posted December 22, 2008 thats ok man thatll do nicely i was just curious thats all. lol. :thumbsup: i'm pretty sure, but i've been away from atv's for years, and in the automotive and heavy equipment and street racers so much that i might get mixed sometimes. for exaple, i havn't been in a mikuni much in the last 15 years, but plenty of carter, edlebrock, holly, and quadraget carbs, and forgot the needles run in the main jets, not the pilots. but electrical is something i never seem to forget for some reason, and everything is coming back in strides. so just in case, i would like to be corrected if i'm wrong Quote
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