Rekluse clutch

[camchain]

Yeah Crisis, that man/auto clutch combo is interesting. Hard to imagine how it might work in practice though. I wonder, could you flick the clutch to break traction, or if you dump the clutch while stopped/or v slow, would it stall? Seems to me as soon as you dump clutch the auto would kick in, so how useful might it be?


Quote Reckless: "How do they go when your like chugging (using the torque) over a slippery dune or hill? Would they disengage?"

For me, it didn't seem to disengage any more than I wanted, just smooth drive even with fairly small amounts of throttle. At no point in my ride (at Woodhill) did it feel like anything other than just plain easier to ride. I never really got to try that type of situation properly though. I think it mostly depends on how well it's set up.

I reckon on a small 2 stroke it could be harder to find that sweet spot in set-up.
I'd have really liked to have a go on that YZ125/auto that was on TradeMe recently!

I wonder too, what it'd be like if say, you were in 3rd going up a soft sand climb, 'off the pipe' - but wanted to get more rear wheel speed (but not clutch slip and useless revs)? With no man clutch lever to flick, i kind of think you'd need to change down.

Pretty sure changing gear without backing off would be as just tough on gearbox as with manual though.

On my mates bike it seemed (almost) as soon as you crack the throttle you get drive. It's just like the very first part of your throttle action becomes the clutch. It didn't feel too slovenly (e.g. not like that 'rubber band' auto transmission feel on a car), just felt more like you'd smoothly disengaged the clutch manually. My clutch feels a bit like an on-off switch! Been thinking about it, and I'd put money on me being quicker through the trees with an auto-clutch.

Another plus that comes to mind for an auto/4 stroke is lack of engine braking, for me an annoying 4T characteristic when swinging through the trees.

Hey btw, what's the deal on a go-kart with no clutch Reckless - how do you start?

[Reckless]

Hey btw, what's the deal on a go-kart with no clutch Reckless - how do you start?

Sprint racing: Crash/Push start out the pits, line up two lines and a rolling lights out start all races.
Road racing: Illegal for no disengage incase you had a sieze at high speed but we made up alloy dog teeth set ups to satisfy scrutineering.
You wouldn't believe how easy you guys treat your engines in MX Bikes!! LOL!!!
I spoke to a karter racing 125 gearbox overseas and they are now machining just over 3kgs out of the big end (crankshaft) in a high performance Rotax kart engine!! I have no reason to disbelieve him but shit that's huge!

[camchain]

That's amazing Reckless, wouldn't have thought a gearbox would stand up to it, especially with such a hard transfer of load with sticky tires on seal. Maybe I can afford to be a bit less of wuss with clutchless shifts.

[motor_mayhem]

KT100 karts are 1 gear and 0-100 in under 10 seconds

[clmintie]

I think any spare money would go into a steering damper for me but if I won lotto I'd love to fit a new bike out with all the bullshit!! LOL!!!

Imagine it!! Brand new 2012 direct injection exc200 with olins damper and forks/shock, Rekluse clutch, pivot pegs, 10 years off the rider, Bloody magic!!!

Imagine a fit, healthy rider, the real 'go fast' goodies..

Life is back to front.. Can't afford the cool stuff till we're too old to use it...

[Reckless]

That's amazing Reckless, wouldn't have thought a gearbox would stand up to it, especially with such a hard transfer of load with sticky tires on seal. Maybe I can afford to be a bit less of wuss with clutchless shifts.

yeh but gearbox seizures where very far and few between, I never had one.
I suppose as long as you shift with no weight on the box ( off throttle) the tyres/load doesn't come into it?

Life is back to front.. Can't afford the cool stuff till we're too old to use it...

Oh never a truer was spoken LOL!!! You are truly wise Oh great one!!

[camchain]

Cheers - interesting stuff Reckless. What's the reason for not running a clutch though, why not have one? Would've thought still a bit hard on gears especially (with amped-up youngsters) if downchanging too early? (E.g. My road going TL had some sort of slipper clutch deal for aggressive downshifts.)

Having never had a gearbox apart, interested to get an idea where main load is with a clutchless shift.

[Crisis management]

Having never had a gearbox apart, interested to get an idea where main load is with a clutchless shift.

Bike gearboxes are constant mesh..all the gears are always in mesh with their opposite gear so the "only" bits being loaded up are the gear dogs on the sides of the gears that interlock to drive through a particular gear set, with a clutchless shift you can't match engine & gear speeds so it's just a matter of forcing the dogs together.

What can possibly go wrong?

[Reckless]

Cheers - interesting stuff Reckless. What's the reason for not running a clutch though, why not have one?

Horsepower my friend LOL!! Think about it if you take the fan off a V8 you gain (is it??) 2 horsepower even on a big engine like that so removing the complete clutch basket off the end off the crank of a 125 ?? I can't remember the dyno figures its to long ago LOL!!

Bike gearboxes are constant mesh..all the gears are always in mesh with their opposite gear so the "only" bits being loaded up are the gear dogs on the sides of the gears that interlock to drive through a particular gear set, with a clutchless shift you can't match engine & gear speeds so it's just a matter of forcing the dogs together.

What can possibly go wrong?

We'd quickly punch down 2-4 gears nearly every corner in a sprint meeting and at Manfield we'd be flat out in 6th punch down one gear, no braking, and sling it onto the sweeper at the end of the straight at 120mph or so in the 125. The gear box ever missed a change, hit false neutral or any such carry one so they must be pretty good. Mind you it was a few years ago hopefully they are still making boxes as good now LOL!!!

Shit we've done a really good job of Hijacking this thread! LOL!!

[Crisis management]

An explanation of gearboxes....

http://www.gadgetjq.com/transmission.htm


Reckless, you're a rough bastard that doesn't appreciate good engineering

[Reckless]

An explanation of gearboxes....

http://www.gadgetjq.com/transmission.htm

Good site!!

Reckless, you're a rough bastard that doesn't appreciate good engineering

All in the name of speed my friend !!!
We never knew to change to oil as I learned you guys do since I started dirt riding either? Maybe you guys have been conned by the oil companies? Although I do notice the fibers, aluminum plates in the clutch and the riding of the clutch (clutching) we do when we ride, do blacken the oil much much faster so I still change mine 5 hours earlier than the book recommends!

[andy 101]

http://ktmtalk.com/index.php?showtopic=390244

Here is a link to the dynaring testing on ktmtalk, I dont know wheather the link will work or not but worth a try.

[camchain]

Great info and answers gents. That gearbox page was good for me crisis, now I get the constant mesh thing / hooking different gears output shafts - cool.

Andy that KTMtalk link was well worth a look.
(for others if link no-worky, it's in the 2-stroke section - REVLOC Dyna Ring)

Auto to Man clutch with turn of a knob? $379 US, and 15 minute install too. Wow. Running fewer plates so probably faster wear, but still seems a pretty amazing device.

[marks]

I have a rekluse on my wr450 and I think the biggest benefit is that, in tight conditions, you don't tire out as quickly. As you get older your energy levels become the major limiting factor and I'm convinced I can ride for at least 25% longer on a auto clutch bike in tight conditions.

My son has a sx250 that we are looking at putting a revloc into so it will be interesting to see how that compares to the rekluse.

On steep hill climbs I struggle on the sx as its hard to keep that perfect point of traction where as the wr just tractors with the clutch slipping as and when needed.