Posted by MTC Engineering on 6/4/2019 to Tech Info
What’s This Gen II Multistage I’ve been hearing about?
So you’ve been hearing about the new Generation II Multistage Lockup units and now you are wondering, is it a lockup or is it a slider clutch? The Gen II is most definitely a lockup clutch. It maintains the use of the clutch lever allowing the rider to ride the bike back from a run and relies on the rider to release the lever for the clutch to engage. Let’s start with what’s the same between the two types of multistage lockups. Both units employ the same arm and counter spring mechanism. Changing the counter springs under the arms will change the timing of the arm application just like the original. Both utilize the same shimming procedure to adjust static spring pressure. The differences between the original multistage lockup and the Gen II are quite large. The Gen II takes a different approach to clutch application. The old standard of clamping the clutch pack between the pressure plate and inner hub is gone. This unit utilizes an inner hub with no back lip, so there is no inward pressure on the hub. A spacer plate is pinned in the bottom of the basket. This plate is replaceable if necessary, which should be rare. The clutch is clamped via the pressure plate which is tabbed to the basket and the spacer plate pinned to the bottom of the basket. Engaging the clutch in this manner eliminates an effect generated by the lockup of pulling out on the clutch basket while clamping the clutch pack. Since all of the force applied inside the basket is to that spacer plate and to the outer basket, it should result in less stress on the rivets in the outer basket. We believe that doing it this way should allow the basket to require less service. The arms are driven by engine RPM instead of input shaft speed, so clutch slippage doesn’t slow down application of the arms resulting in more repeatable runs.
Speaking of maintenance, you will be able to change the counter springs in the Gen II while it is still installed thanks to a quick access plate on the top of the unit(See picture). No longer will you have to remove the lockup from the bike, take the weights from the arms, take out the screws on the dowel pins, knock the arm and bucket out to change the springs. With the Gen II, you will remove the cover plate screws, make your change, bolt the cover plate back on, put the clutch cover on and you are ready to go. Altering the static spring pressure will still require the removal of the lockup unit from the clutch basket, but the removal of the lockup is aided by six included bolts. These bolts ensure that you will not be fighting the clutch springs to reinstall the lockup unit and tighten the lockup bolts. After the hat is secure, just remove the six bolts on the clutch springs and put them away until their next use. Now let’s clear up some misunderstandings. This unit is not a slider clutch, nor does it work like a slider clutch, they only use the same clutch basket. It does bring the arms in sooner than the original multistage because the lockup is now driven by the clutch basket and not the input shaft. The arms are restrained by the small counter springs which control where/when the arm will apply, whereas a slider’s arms are free and begin to apply pressure to the pressure plate as soon as the motor is running, which at idle, isn’t going to move or stall the bike. The Gen II requires the use of a clutch lever to disengage the clutch, unlike the slider which fully disengages when the engine RPM drops below the stall speed. It still employs static clutch springs and if you release the clutch lever, with the brake on,it will stall the engine. Additionally, the comparisons between the Gen II and Gann Clutch are not accurate either. The only similarity between the two is that they are driven off the basket(engine RPM). The Gen II is a completely different animal in just about every aspect.
If you have any other questions please contact MTC Tech Support (321) 636-9480 or via email at [email protected]