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Post by greentoker26 on Nov 10, 2014 15:50:43 GMT -5
OK so I just I can't do any more upgrades to the engine except a stroker upgrade which hopefully will be one day in the future so besides buying a crank. Now the scooter is completely great by myself but with my fiance when we go uphills our stock transmission can not take it, together we weigh about 280 lbs. and uphill we lose all power will only go to 4 rpms and about 20-25 mph depending on how much of an incline it is. Besides hills everything is great keep up with traffic with me and her even while I am taking it easy in the break in process. Now I am going to buy all new performance transmission parts (gears, variator, sliders, clutch assembly, etc.) but I have a budget and am wondering what would be the best thing to buy first for under a $100 and get the best deal to solve my problem I am hoping someone can help me out on here. The kit I bought came with 8 gram rollers and I will get sliders pretty soon but I don't think that will solve my problem.  I would love to get this but its just so expensive, not even that just too much at once. |
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Post by alleyoop on Nov 10, 2014 16:04:52 GMT -5
The thing you want is to keep the RPMS up going up a hill or an incline. So having 8gram weights are pretty heavy for a 50cc. Most folks will go with much lower weights to get the rpms up and keep them up going up a hill. Before you go and spend a some coins just get some 5-6 gram rollers and try them. Going to 5 gram from 8 gram you will pick up around 1500 rpms that is a lot. Remember for every gram ROLLERS up or down the rpms will change from 500-600, Sliders 200-350.
So knowing how your rpms will change with each gram up or down you can tune your CVT to keep the power up going up a hill and just loose mph due to the weight slowing it down. Your Cvt should be tuned to only loose a couple of hundred rpms not thousands.
Alleyoop
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Post by UniqueSP on Nov 10, 2014 21:25:54 GMT -5
When i lived in Puerto Rico which is mountainous. I sometimes had to go to a town that was up a mountain about 2,000 feet up. I would actually switch out my roller weights from heavy which i used in my town since it was flat most of the time so i wanted speed. to light weight rollers to get those extra RPMS to get up the mountain. I weigh about 250lb
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Post by greentoker26 on Nov 11, 2014 12:43:25 GMT -5
Thanks for the quick reply alleyoop,
But I installed the 8 gram weights because it came with the kit I bought, so I figured that would be the recommended weight for the 50mm piston kit I installed. I have a very accurate scale and I have extra 4.8 and 5.8 gram rollers which I assume are 5 and 6 gram rollers. the 5 grams are stock and the 6 gram weights are from a wrecked 47mm big bore 139qmb. So I will try the 6 gram rollers since you advise this alleyoop, I will let you know how it works out. Although the 8 gram rollers are great for everything else its just hills with me and my fiance which is about 280 lbs combined weight. But alleyoop I have decided to buy a ncy performance transmission kit in about 3 weeks or so, so what spring rates for the small and big springs would you suggest I get? Considering my set up which is performance parts from the 50mm piston all the way up to the carb and air filter. So me and fiance can get some power uphills we encounter them often on the way to our work places. I like you alleyoop your very helpful thank you man!
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Post by alleyoop on Nov 11, 2014 15:17:55 GMT -5
One thing I can tell you is you are getting one of the better CVT kits(NCY) they are the lightest of any of them out there. Not the greatest for the max top end but still no slouch but very good in your low end.
The springs and weights are a trial and error thing, no two motors and or cvts will usually give the same results. To many variables, type of variator, type of weights, belt, clutch, how strong of a motor, wheel size etc..
The springs on the clutch pads as the weights in the variatopr work by centrifugal force, which translates into RPMs how fast the crank is turning. So it is all on how you like to ride around and the area you ride around in will dictate your cvt setup. Now if the motor has a lot of power then you can usually have strong takeoffs as well as the most top end possible. But usually you will have to give a little on the bottom or the top and find a middle ground, one with good acceleration and descent top end. Some live in the city and they need all low end power and torque to scoot from light to light and stop sign to stop sign and not much long stretches where top end is a concern. Then you have the opposite folks that live out in the boonies where they have to travel on highways they need top end to keep up with the fast traffic and they will give up the low end for the top end.
Just remember they have Clutch Pad Springs rated 1000, 1500 and 2000, Which translates into adding that number to the rpms that currently are required for you clutch pads to be thrown out and grab the bell to turn the rear wheel.
Example: If currently your scoot starts to move at 2500 rpms and you put in 1000 rated clutch pads springs NOW your scoot will start to move when the rpms are around 3500 rpms and so on.
The Contra Springs are rated the same but what they do is put a lot of pressure on the side of the belt keeping it up high in the clutch pulley. That again translates into more rpms required to force open the Clutch Pulley so the belt drops down for top end speed. Also when you let off the throttle the pulley will close quicker pushing the belt up much quicker and getting the belt in the low ratio quicker as well as your rpms because it now is putting a load on the motor.
I personally do not like stronger Contra Springs and or stronger Clutch Pad Springs. All they do is basically require you to ride around with higher RPMS just to cruise around nice and easy, but that is my taste.
Alleyoop
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Post by greentoker26 on Nov 12, 2014 13:01:22 GMT -5
Thanks for all the info alleyoop all very helpful! Now I live in vegas where I drive all around, so I encounter a mix of stop signs/lights and long stretches although right now I am perfectly happy with my top end and just feel like my acceleration could use a little help but if thats what the spring ratings change then I will most likely stick really close to the stock spring ratings. I am sure once I get some sliders that will solve my problem but right now I am running 8 grams which you said is really heavy so I figure 7 gram rollers is what I need and that being said what weight sliders should I get I am pretty sure I remember them needing to be either a gram lighter or a gram heavier, compared to rollers, but I can't remember can you shed some light on that for me alleyoop?
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..BAD TO THE BONE..
