flynpa
New Puppy Dawg
Posts: 3
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Post by flynpa on May 1, 2009 21:04:10 GMT -5
Hello all. I am trying to change the CVT belt on my buddy's Titan 150cc scooter. I can't get the belt to just slip over like in the video. I tried to get the nut off the variator but it won't budge. The generic scooter manual that I am looking at says that they usually have left handed threads. Can anyone confirm this? I have tried it both ways but it just won't budge. Any ideas?
I hope I am calling the part with the nut correctly. I am referring to the pulley connected to the engine, not the wheel.
Thanks,
Stuart (flynpa)
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Post by cruiser66 on May 1, 2009 21:17:50 GMT -5
Welcome to ScootDawg Stuart.
To remove the nut you go counterclockwise or left. These nuts are on pretty tight and most people use an impact wrench. HarborFreight is a good place to get one.
66
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Post by usfmarine on May 1, 2009 21:24:55 GMT -5
I hate the idea of spending a bunch of money on an impact wrench for ONE nut. I guess I should just do it before my belt snaps though. Grr. I do have a temporary 20% off harbor freight coupon.
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Post by usfmarine on May 1, 2009 21:26:03 GMT -5
What size nut is that by the way, want to make sure I get the right socket with the impact wrench.
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flynpa
New Puppy Dawg
Posts: 3
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Post by flynpa on May 1, 2009 21:28:11 GMT -5
Thanks 66. I went and got a craftsman impact wrench just for this and I am pretty disappointed with its power. The nut wouldn't budge. I will try again tomorrow.
It is 17mm.
Stuart
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Post by usfmarine on May 1, 2009 22:31:04 GMT -5
I hope you didn't tighten it  How many foot pounds of torque did your Craftsman have? |
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Post by cruiser66 on May 1, 2009 22:56:47 GMT -5
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Post by bob on May 1, 2009 23:55:11 GMT -5
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Post by 2btiger on May 2, 2009 0:14:13 GMT -5
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Post by erictheviking666 on May 2, 2009 1:22:21 GMT -5
I have the El-cheapo $19.95 Harbor Freight 12v Impact, and it took mine right off no problem. You may have tightened it accidently before. I would say to keep trying as long as its not messing up the variator nut. It will be easier than a socket & breaker bar.
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Post by Riddick79 on May 2, 2009 3:38:44 GMT -5
If your impact wrench is cordless, make sure that the battery is fully charged. Mine wouldn't budge and I couldn't find a way to get it off, so I recharged for a few hours and it finally budged.  My variator nut is 19mm... but I have an MC-54-250. |
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Post by earlwb on May 2, 2009 7:40:45 GMT -5
A cordless impact wrench won't work. Not enough torque and impact power.
A 110c AC impact wrench may work, if it is a fairly powerful one.
The good air powered impact wrenches work well, but you need a big air tank to keep the air pressure up.
I use a socket with a long breaker bar and a homemade variator tool which is shown in several threads already.
Easy to make the tool. You only need a drill to drill three holes and a hacksaw to cut off part of it. Choose the bolts to match the hole size in the variator.
One thing though, you don't hammer, or try to jerk or snap the nut loose, that could result in the variator breaking or cracking. Don't touch or put pressure on the fan blade fins. Use your body weight as you apply firm even pressure steadily increasing until the nut comes loose. Do check the end of the nut closely, as I had to first scrape and chisel off some kind of a clear epoxy like substance intended to keep the nut from coming loose. Use blue locktite when you reassemble.
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Post by earlwb on May 2, 2009 7:46:03 GMT -5
That pitposse tool should work OK, it has both 5mm and 9mm pins for matching up to the variator.
On my homemade variator tool, I deliberately made it long enough to hook under or over the clutch, so I didn't have to hold the tool while putting all my body weight into loosening the varator nut.
So on the Pitposse tool, I don't know if it is long enough, but it does look pretty good. A couple of years ago, they didn't have that tool available.
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Post by bob on May 2, 2009 9:18:15 GMT -5
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Post by 2btiger on May 2, 2009 11:17:32 GMT -5
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flynpa
New Puppy Dawg
Posts: 3
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Post by flynpa on May 2, 2009 16:28:13 GMT -5
Got it! Gave it a couple taps with a hammer, then the impact wrench took it right off. Thanks.
Stuart (flynpa)
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Post by scooter3oy on May 2, 2009 18:39:03 GMT -5
and when putting the variator nut back on, it's advisable to use Loctite...i was playing around with different variator slider weights the other day, and after a swap, i was about 1/2 mile from my house when i started hearing a loud rattling coming from the transmission....scooter still seemed to run OK, but the loud clatter was disconcerting  so i killed the engine and pushed the scoot back to my house....after taking the CVT cover off, i noticed the variator nut had come loose...did not come completely off, but was barely hanging on....and this was after having my impact driver set to 50 ft. lbs.....so i now use Loctite every time i put the nut back on |
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Post by earlwb on May 3, 2009 9:20:29 GMT -5
2btiger, I saw those tools before too, but I don't recommend them as I can't tell which one to order from their website.
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Post by numbski on May 5, 2009 8:45:47 GMT -5
Glad I read this thread - was considering opening up my variator to get a look inside....wouldn't have thought of any of this! |
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Post by Troll on May 5, 2009 9:52:18 GMT -5
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Post by neilb on May 5, 2009 10:42:20 GMT -5
A cordless impact wrench won't work. Not enough torque and impact power. A 110c AC impact wrench may work, if it is a fairly powerful one. The good air powered impact wrenches work well, but you need a big air tank to keep the air pressure up. I use a socket with a long breaker bar and a homemade variator tool which is shown in several threads already. Easy to make the tool. You only need a drill to drill three holes and a hacksaw to cut off part of it. Choose the bolts to match the hole size in the variator. One thing though, you don't hammer, or try to jerk or snap the nut loose, that could result in the variator breaking or cracking. Don't touch or put pressure on the fan blade fins. Use your body weight as you apply firm even pressure steadily increasing until the nut comes loose. Do check the end of the nut closely, as I had to first scrape and chisel off some kind of a clear epoxy like substance intended to keep the nut from coming loose. Use blue locktite when you reassemble. Earlwb, I have the Bali 250cc, like Gary's, and we don't have the 2 holes on the CVT cover. What tool do you suggest I use to prevent the CVT from moving, if any? Thank you. |
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Post by jspencer on May 5, 2009 17:23:36 GMT -5
Take the scooter down to your local tire shop and have them take the variator nut off with their air-powered impact wrench. Then put the nut back on, tightening it with your portable battery-powered impact wrench. It'll cost you just a few bucks, or nothing if you are a regular customer.
As long as you tighten it with the portable impact wrench you will be able to remove it with the same wrench. I did this and it worked like a dream.
Jon
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Post by earlwb on May 5, 2009 17:29:43 GMT -5
You will have to use a good pneumatic air impact wrench on that nut then.
I am surprised there are no two locking holes on the variator. There is basically one or two companies that casts up all the variator pulley halves for everyone, and they carefully copied the originals to the most minute detail. So there are likely two holes there.
Can you take a pic of this variator for us and post it? We would like to see it.
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Post by neilb on May 5, 2009 20:07:08 GMT -5
You will have to use a good pneumatic air impact wrench on that nut then. I am surprised there are no two locking holes on the variator. There is basically one or two companies that casts up all the variator pulley halves for everyone, and they carefully copied the originals to the most minute detail. So there are likely two holes there. Can you take a pic of this variator for us and post it? We would like to see it. Hey Earlwb. Here is the pic - courtesy of Gary.  |
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Post by bob on May 6, 2009 0:01:17 GMT -5
This isn't earlwb but I would suggest a strap wrench. That's the first one I have seen without the two holes 180degree apart built into the fan blades.Bob
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Post by trigger on May 6, 2009 20:31:39 GMT -5
Great thread, thanks!
Is there any chance you could bend a rod with the a impact wrench? I am thinking about looking at my weights since I have over 5000 miles and hear a little noise coming from the variator lately. I have an impact, just a little worried about using it.
Ride on
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Post by madmanjustice on May 6, 2009 22:14:54 GMT -5
You will have to use a good pneumatic air impact wrench on that nut then. I am surprised there are no two locking holes on the variator. There is basically one or two companies that casts up all the variator pulley halves for everyone, and they carefully copied the originals to the most minute detail. So there are likely two holes there. Can you take a pic of this variator for us and post it? We would like to see it. the CN250 (CfMoto style motor) variator does not have the holes like its Linhai counterpart. |
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