KX Riders
Maintenance & Technical => KX500 Original => Topic started by: Kawadougie on September 19, 2004, 03:36:59 PM
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It actually rained today and above 5000 feet it snowed. We hit about
6500 feet at the top and had about 2" of snow. Almost no dust at all. I
had just installed a prototype EFM Autoclutch in my KX-500 and had Eric Gorr port the cylinder and flow the head for bottom end power. Gary at EFM machined a spacer and clutch cover for my bike. The autoclutch worked perfect. It was actually better to start the bike in gear. You cannot stall the motor. I can rip into a corner and lock up the rear wheel and accelerate out of it. With a big bore two stroke, you always fear killing the motor in some tight trail with the motor hot enough to cook bacon and no room to kick it properly. Now, everytime you slow down the clutch is pulled in for you and it just sits there and idles. Pretty cool.
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WOW!Nice! Is the whole cover new,or is it based off the stock one?A top view picture please?
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Awesome! :shock: I also like the removeable clutch cover. Any more pictures?
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I sent the stock cover to EFM and they just milled off the clutch portion and machined up a flange and a cover plate. See photo.
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Very nice work! 8) 8) 8)
The cover looks cool too,factory look. :D
What parts did they use from stockclutch?
Did they use something from the kx250-setup they have for sales?
Can we "force" EFM(Gary) to make more of them? :lol: :lol: :lol:
Can you tell how much it cost or is it a secret?
//doordie
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I would imagine that if the time / effort where put into making the proto-type then one will be coming shortly. Especially if the feedback they recieve is positive. My suggestion at this point - UNLESS YOU WHERE TOLD NOT TO SAY ANYTHING - would be for the members that are interested in this to email info@efm-billet.com or call (if you're in the states) 330-947-1700 and express your interest.
Hell send them this link so they can follow the ride reporting Kawadougie is doing and at the same time see some live feedback.
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Alreay emailed them. I've been wanting a autoclutch for a long time now but found the Revloc a little too expensive.
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Garry at EFM charges $499 for any clutch he makes. The stock clutch basket is modified to mount the pressure plate. The new pressure plate has ball bearings that ramp down and put pressure on the stock clutch plates proportional to the speed of the motor. He made the cover and flange for $100. I had a local welder attach the flange for $80. You MUST use steel plates since the aluminum plates grow too much with heat. My work involved removing the excess welding bead and bending the brake lever to fit. :)
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Did the Revloc require making a mod to the case?
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Nice!Does look cool!
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The EFM clutch pressure plate assembly is roughly 1/2" wider than the stock clutch basket cover. Most modern dirt bikes today have a removeable cover which makes a spacer easy to manufacture.
The cool thing about this clutch is that you just turn the throttle and go. I haven't tried it without the flywheel weight yet, but that might be interesting too. :shock:
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Kawadougie,
Cool clutch! What is it like on deceleration? I raced an automatic 360 husky for a bit and it was odd going down hill since it would freewheel, with no engine braking. Took a bit to get used to. Does this clutch do the same? Cam.
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Come to think of it this probably wouldn't be much of an issue. I find I pull in the clutch as a habit whenever I use the rear brake so I don't stall (no steahly). In practise that wouldn't be much different than the clutch disengaging at idle. Neat! Cam.
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Had to have this thing! :twisted:
Can you tuning what rpm for engage and disengage,(sorry about spelling)? :oops:
Maybe with heavier/lighter balls or spring preload?
I will send a email to EFM and ask if they can ship it to Europe/Sweden.
Do you guys know what price for a clutchbasket in US?
//doordie
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This is much different than the old Auto Husky. It acts just like a regular clutch until the RPM's drop off. then it disengages automatically. You can adjust the speed of disengagement by adding or subtracting some small spring washers. On downhills you still have engine braking but if you lock up the rear wheel, the auto clutch will save you from killing the motor. It almost encourages you to ride in a higher gear, but if you climb a hill and the RPM is too low, the clutch will slip. Just shift down or crank on the throttle to go faster. It's a 70 HP woods scooter! :shock:
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Nor-Cal?Where abouts?Yeah,nothings like the old Husky AE's,always breaking parts!I still have a 390 and a 500AE out in the shed,resting.
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I live in Folsom, near Sacramento. I used to ride with a guy up in Oregon who rode a 430 Auto. He was blazingly fast in the woods on that thing but every now and then he would stop, cuss out loud, throw the bike on the right side and start ripping off the left engine cover. He carried spare parts in his bag and could repair it in about ten minutes or so.
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Im in Redding Ca,I caught a few people by surprise on my auto also!
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KXcam22 and mikesmith!
You know that Husqvarna is from Sweden and this "scooter" were awesome for that time! :D :D :D
Many Endurochamps ride it, but broke a lot of races and stop race them.
It was to much maintance. :evil: :evil: :evil:
I have race many huskys in my days,were very easy to shift engine to
another size: 125,240,250,390,420,430,488 in same frame to 1987
modell i think! 8) 8) 8)
//doordie
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Yes your right Doordie,but when Cagiva bought Husky out a few years later it became real hard to get parts.Thats why my 390 and 500 auto sit out in a shed and my brother has a 410 that sits,but in the 70's to about '82 they where a great bike.Husky had built the first competitve 4 stroke that started the whole 4 stroke thing going.
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Just gave them a call over at efm and they are planning to keep making this conversion for the MIGHTY KX but its gonna cost ya 6-7 hundies and some good lead time to own one.Because GOODIES aren't always there when you want them I'll put my order in soon.
eric 04kx500
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I had a 250 and 390 Husky in 1978. I used to break the trans gears regularly, and it wasn't even the auto. Raced the 360 auto a few times but didn't break it. Weird on downhills. That EFM clutch looks pretty cool. Cam.
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All we need now is an e starter and we'll be set.
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All we need now is an e starter and we'll be set.
Naah, the kicker works as an anti theft device :lol:
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good point!
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Clutch lever, perch and cable for sale - cheap!!!
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If I ever get one, I'd love to show up at a GP, live engine start with one hand on the helmet and IN GEAR! I'd also have to remove the hand guards, clutch and perch just to see people confused faces. :)
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I rode the big KX up in Southern Oregon this weekend. I put the extra springs in to make the clutch kick in at a higher RPM and changed the oil to my standard Castrol GTX 20-50W. It worked perfect. We rode some of the gnarliest trails I've been on in many years and the clutch worked great. I did discover it was better to start the bike in gear than to start it and then click it in gear. It really makes the bike very easy to ride. You know those tight woods sections where the motor gets hot and you inevitably kill the motor and have to start it a few times? Never killed it once. I swapped bikes so I could ride this guys 250 Honda 4 stroke and he wouldn't give my bike back!
I would also recommend Eric Gorr for porting. I had him port it for increased bottom end which included milling the bottom of the cylinder and relieving the head - all for $185.00!!! The motor hits right off the bottom and pulls cleanly. http://ericgorr.com/services/porting.html
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I've got a RevLoc automatic clutch in mine, it's very cool. You can be up an extra gear or two of what you normally would be and just roll on the throttle. We've had alot of rain in my area the past few days and since I just recently got my bike I wanted to ride anyway, and the RevLoc made things much easier. I used 2nd gear in some places that had 2 foot deep water and mud and didn't have to do a thing except apply the throttle. Without the RevLoc I would have had to baby the clutch all the way through.
The KX500 has so much power that it is nice to be able to have both hands firmly on the bars when really rolling on the power.
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By the way, I noticed you eliminated your clutch lever completely. With the RevLoc you are still able to manually over-ride the RevLoc unit and use your clutch lever to upshift or downshift if you want to reduce the extra stress that gets applied to the transmission, to me that is important.
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Glenn KX500,
Do you have a Revloc unit? :roll:
I didnt thought they made anyone for Kx500?
Is it for another brand with the same spec?s?
//doordie
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I don't know what the eye rolling is for, but yes.. it is a Revloc.
http://www.RevLoc.com
There is one available for the KX500, and from what I've read about the different manufacturers the RevLoc is the best. You still have the clutch lever to over-ride it and you can adjust the RPM it kicks in at by changing the stiffness of the springs. It's really neat how it works. I wouldn't have spent $1000 on it, though. It came with the bike.
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You don't have to remove the manual clutch lever when you install the EFM. The main reason I eliminated my clutch lever is that I wanted to get used to the automatic clutch. I can re-install it anytime. The EFM clutch works so well that I've never missed it! They even make a hydraulic rear brake lever that mounts in the same place on the bar but I might have trouble getting used to that. :shock: