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Post by quail on Apr 13, 2013 0:55:34 GMT -5
What size and weight sliders do I need for my 2008 mc54-250b? I read 15 grams was the best but I don't know the size. I want to buy them so I can take it apart and put it back together the same day.
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Post by oldmopars on Apr 13, 2013 21:13:45 GMT -5
As far as I know, the MC-54-250B uses a 20x12 slider, however I do not know what the stock weight is. Anyone know that?
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Post by ridecheap on Apr 13, 2013 22:01:01 GMT -5
Yes Comes stock with 20x12 14 gram rollers...... I put in 20x12 15 gram sliders and it jumps off the line and the top speed is there.
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Post by quail on Apr 14, 2013 11:59:06 GMT -5
[replyingto=ridecheap]ridecheap[/replyingto]ridecheap; I read your post on your mods. I have been looking for the 15 gram sliders but can't find them. I looked on the Dr Pulley site. I am assuming you have the Yamaha style engine. What is the advantage of the 18 coil magneto? How is it custom?
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Post by ridecheap on Apr 14, 2013 12:09:49 GMT -5
ridecheap; I read your post on your mods. I have been looking for the 15 gram sliders but can't find them. I looked on the Dr Pulley site. I am assuming you have the Yamaha style engine. What is the advantage of the 18 coil magneto? How is it custom? Heres the link for the 15 gram sliders 20x12 www.partsforscooters.com/169-290_Dr_Pulley_Roller_WeightsI took out the small 18 coil stator which is located within all the oil under the stator cover. I ordered another 18 coil magneto that was thicker coil wise more charge but still 18 coil. I had to make my own little mount to the stator cover but better power with the flywheel turning it. Not a huge advantage I ordered a thicker one 18 coil and made it fit. |
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Post by quail on Apr 15, 2013 6:09:04 GMT -5
[replyingto=ridecheap]ridecheap[/replyingto]well the 15 grams are on the way.!
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Post by ridecheap on Apr 15, 2013 13:22:15 GMT -5
Yeah you will see a much smoother and more jump off the start with these 15 grams sliders. Get some white lithium grease to relube the variator dont run it dry.
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Post by quail on Apr 15, 2013 20:01:50 GMT -5
There has to be something better than white lithium grease!
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Post by JR on Apr 18, 2013 8:52:09 GMT -5
Sorry going to disagree with this assessment on two things, one DO NOT grease sliders, they by their make and design are self lubricating, grease will eventually make them stick and cause shifting problems. ONLY grease the center shaft (boss) and the "U" slides on the variator face plate and then very little on the "U" slides.
Two even though 15 gram sliders will change the way your scooter takes off and runs 15g will actually have a slower take off than the 14g rollers, simple equation they are heavier.
Also 15g sliders if you run in the hills like I do will lose top end and make the engine drag with reduced RPM. If you are riding on nothing but flat ground then you'll be fine but if you ride like I do in the Ozarks you will hate the results of the heavier 15g sliders. I use 12g sliders from the original 14g rollers some who ride in even higher elevations use as low as 10g.
Remember the rule of thumb:
Rollers = 500 rpm reduction for every gram heavier you go and 500 rpm add by reducing the weight.
Sliders = 350 rpm reduction fro every gram heavier you go and 350 rpm add by reducing weight.
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Post by quail on Apr 18, 2013 21:53:05 GMT -5
[replyingto=jr]JR[/replyingto]I could not figure out how more weight would give a better low end accel. But I could see how by design sliders could give a better top end. So I order the 15 gram sliders..no that was not the best choice. The tach tells the story, the belt moves into a high ratio to fast. It will work ok for my wife due to her light weight.
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Post by quail on Apr 18, 2013 21:57:42 GMT -5
Sorry going to disagree with this assessment on two things, one DO NOT grease sliders, they by their make and design are self lubricating, grease will eventually make them stick and cause shifting problems. ONLY grease the center shaft (boss) and the "U" slides on the variator face plate and then very little on the "U" slides. Two even though 15 gram sliders will change the way your scooter takes off and runs 15g will actually have a slower take off than the 14g rollers, simple equation they are heavier. Also 15g sliders if you run in the hills like I do will lose top end and make the engine drag with reduced RPM. If you are riding on nothing but flat ground then you'll be fine but if you ride like I do in the Ozarks you will hate the results of the heavier 15g sliders. I use 12g sliders from the original 14g rollers some who ride in even higher elevations use as low as 10g. Remember the rule of thumb: Rollers = 500 rpm reduction for every gram heavier you go and 500 rpm add by reducing the weight. Sliders = 350 rpm reduction fro every gram heavier you go and 350 rpm add by reducing weight. Can you still reach 70 MPH with 10 gram sliders? Nice to run into you again JR. |
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Post by skuttadawg on Apr 18, 2013 22:15:36 GMT -5
Never use grease it could cause the belt to slip . Clean out any dust with a clean rag .
I read where a guy used wax and a soft buffing wheel to make the sliders and ramps smooth . I have not done this but it sounds plausible .
You can buy 2 gram heavier sliders and test . You can also mix up 3 15g and 3 17g to equal 16g
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Post by JR on Apr 18, 2013 22:43:12 GMT -5
On the linhai leave it dry skuttadawg, even graphite will come back to haunt you. Sliders are self lubricating and work very well dry.
Quail one should hit 70mph with 10g in but the 12g I have found gives you the best of all worlds:
Very good take off
slips into lower range in the hills and holds the rpm up to pull better
good overall top end
doesn't kill your MPG.
If you're running in all terrains I would highly recommend 12g with the 250B.
JR
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