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Post by redhouse7 on Feb 26, 2012 10:51:50 GMT -5
Looking for a little help...I can't get the nut to loosen up on the variator/clutch on my Jonway 250 (CF250 engine).
I've tried some penetrating oil, 1/2" impact, an assortment of wrenches. I think if there was a way to "lock" the engine I could get it off, but now it just turns and I can't get anything to keep the engine from turning. I tried a strap wrench around the variator, a chain wrench, and sticking a screwdriver in the cooling fins (broke one off, damn).
I'm sure someone out there knows how to keep the engine from turning and can help a guy out!
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Post by nulldevice on Feb 26, 2012 13:29:42 GMT -5
You didn't say what kind of 1/2 inch impact wrench. If it is an air driven one, get an air supply of about 125 - 150 PS, a short hose from the air tank to air wrench,I and check the wrench over for a knob or dial you can turn to change the maximum torque and set it to the strongest setting. If it is an air driven one, be quick about pulling the trigger all the way back.
In any case, use impact sockets and hold the wrench firmly with both hands and in line with the socket. Both will increase the energy that transfers to the nut and save your hand wrench sockets.
Don't just stand there and hammer away with the motor turning. Do a short burst of 4-5 whacks then, let the motor stop turning, do another burst. Rinse and repeat until it comes loose.
If that doesn't do it, I have non-wrench ideas but they require a new nut when you are done.
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Post by leo on Feb 26, 2012 22:00:09 GMT -5
Looking for a little help...I can't get the nut to loosen up on the variator/clutch on my Jonway 250 (CF250 engine). you will need an impact wrench or some other special tool to hold the variator. DO NOT try to use a screw driver in the fins, your fins will break off. wedging the belt will not work either, at least it doesn't on my bike. a strap wrench will work but it requires 2 people. one to hold the strap wrench, the other to break the nut loose. honda sells a special tool to hold the variator, part # 07923-KM10000 |
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Post by mainepeace on Feb 26, 2012 23:38:53 GMT -5
There are some people that say you can put some rope in the cylinder through the spark plug hole when the piston is lowered to BDC. I'm not sure if I would try it, but it's a known procedure. There actually is a tool that threads into the spark plug hole and pushes on the piston to keep it from moving.  there is another tool available. Greg |
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Post by WarrenS on Feb 27, 2012 10:06:22 GMT -5
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Post by mainepeace on Feb 27, 2012 13:56:37 GMT -5
Some people have had success with the right size spanner wrench too. Of course it only works if you have a metal fan (like most 250's have).
Greg
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Post by redhouse7 on Mar 1, 2012 15:28:04 GMT -5
Thanks, I'll see what works.
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Post by earlwb on Mar 1, 2012 16:22:23 GMT -5
Like Warrens stated, I needed to use a big wrench breaker bar handle and even then it took my body weight on the nut to get it to pop loose. The factory puts them on tight. One thing to looks for is whether they stuck on some epoxy like stuff to help keep the nut on there or not. I had to chisel off some clear epoxy like stuff, before I went to loosen the nut. You can see what I did above in the thread Warrens mentioned. If you use a air impact wrench, you need to use some serious air pressure. I never got any electric or battery powered impact wrench to work on these variator nuts that the factory put on. I needed to fabricate a variator tool to lock the variator in place. The screws or bolts used are chosen to match the holes in the variator. I also make the handle long enough to allow it to catch up against the clutch housing too. I also use a six sided socket, preferably a impact socket, do not use the 12 sided sockets that only grip the corner tips of the nut, otherwise you will strip the corners off the nut.  |
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Post by wile on Mar 1, 2012 16:32:20 GMT -5
You can also try hitting the wrench handle with a hammer, it acts a little like an impact wrench.
Wile
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Post by leo on Mar 1, 2012 17:55:09 GMT -5
I needed to fabricate a variator tool to lock the variator in place. The screws or bolts used are chosen to match the holes in the variator. the problem for us 244cc owners is that the variator does not have the holes needed for the tool to work. caveat: the 244cc variator faces will mate together perfectly. an old face can be used as a holder if the spindle hole is drilled to accept the socket and a handle attached. |
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Post by bikerdude on Mar 4, 2012 15:08:01 GMT -5
In this case I would go to a garage and tell them to loosen it for you. After that you will be able to do it on your own. I was shopping for impact guns and got an earth quake dual hammer gun. Up to 800lbs force thank god adjustable. I had to crank it 3/4 and do 1 sec bursts on some those buggers.
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Post by redhouse7 on Mar 4, 2012 21:56:40 GMT -5
I think I'll just bring it in, pay $20 to have someone loosen it up.
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Post by redhouse7 on Feb 13, 2013 13:29:23 GMT -5
This is a follow up. The solution I found was in my garage all the time...A piece of 3/8th rope. Remove the spark plug shove the rope in the hole until you get a few inches in there and it keeps the piston from moving past TDC essentially locking the motor. Works like a charm.
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