Undercut Gears

Rocket Scientist said:
Not sure why most bike manufacturers don't undercut the gears to begin with. Here's a pic from an early 60's 305 Honda. Look at the amount of backcut on those gears from the factory.

Click to expand...

Maybe it's the cheaper option they take. With the amount of Rockets on the road by comparison it may be a small number that have most of the problems. As someone said this week on this thread we only hear about the faulty machines.
 
It will a disqualifier when I shop for bikes in the future, no undercut...no purchase, that simple.

There is no valid excuse aside from “price point”.
 
A lot of the times a bike jumping out of gear can be caused by the selector forks worn as these can have a massive bearing on holding the gears together...the forks have little hardened pads at the end which run in grooves...ive seen these little buggers blue as they have run that hot. Not holding the gear lever up or down after shifting can prolong there lives or not resting your feet against the spring with the motor running can help too. Remember that the gear teeth only alter the ratio of the drive train and its the gear dogs that transmit all the power and torque so they are a vital part that need to be 100% and hopefully no rounded edges as this then is all downhill after this happens
 
Did we ever establish if the dogs are case hardened? Ive been curious as to whether or not undercutting by a degree or 2 would remove the harder metal.
 
Ahaha Mr Hunt. Regarding case hardening, if they are case hardened undercutting will most certainly cut through it.

The reason undercut should be the standard is it prevents all those other gentle bits (forks, drum, etc) from getting damaged in the first place.

Yes, the engine has to get split to do the trans.
 
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