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Post by rogerdog23 on Jul 6, 2019 9:54:40 GMT -5
Hi All—I completed my first two engine mods yesterday on a 2014 4t Kymco Agility 50 and it really messed something up. I can only go 10-15 miles an hour now on flat ground!
1. Replaced original rollers (scoot only has 500 miles on it) with dr pulley roller sliders 6 gram.
2. Replaced original torque spring with a 1500 rpm spring.
Put it back together and everything sounds fine and accelerates to about 15 miles an hour and then I can’t go any faster (was going close to 40 before the mods). Engine doesn’t sound like it is working hard at all and definitely isn’t over revving.
My only hint to offer is I couldn’t get the belt back on as it was too tight so I opened the back pulley a bit and snuck the belt in so it could get deep in the pulley and I’d have plenty of slack to get the belt on the front. Not sure if this could cause an issue but thought I’d mention. Oh, also I lost the tiny washer that goes on the very outside nut that holds the clutch assembly on (the 14mm nut, not the 39mm one). Can’t imagine losing a thin washer would cause this problem but want folks to have all the info I have (I’ll replace the washer as soon as I can).
Really appreciate any help...
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Post by pinkscoot on Jul 6, 2019 15:12:27 GMT -5
It sounds like you trapped the belt into the variation when you tightened it. Once you revved the engine it came loose but the variator isn't tight now. Pull the CVT cover off and see if the variator is still tight. When you put a belt back on you should pull it down into the clutch so that its slack on the variator, after you tighten it turn the belt to be sure it isn't tight. On some scoots that thin washer is what it needs so that you have threads left on the crank shaft.
Another word to the wise when tuning, do one thing at a time. In your case new sliders, install them and see how it runs. If you need more bite on the clutch then add the torque spring.
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Post by SMALL CC TEK on Jul 6, 2019 22:40:47 GMT -5
It sounds like you trapped the belt into the variation when you tightened it. Once you revved the engine it came loose but the variator isn't tight now. Pull the CVT cover off and see if the variator is still tight. When you put a belt back on you should pull it down into the clutch so that its slack on the variator, after you tighten it turn the belt to be sure it isn't tight. On some scoots that thin washer is what it needs so that you have threads left on the crank shaft. Another word to the wise when tuning, do one thing at a time. In your case new sliders, install them and see how it runs. If you need more bite on the clutch then add the torque spring. One thing at a time best advice. Pull it all apart and start over , did you install the sliders correctly ? It's easy to stick them in wrong if you have never done it . I think your good on the washer just check i can't remember just check be for you take it off if everything is all tight . If you have the Contra on correctly don't take that apart . |
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Post by rogerdog23 on Jul 7, 2019 8:26:14 GMT -5
I went back to stock and everything was fine. Tried every combo of new and old parts and realized I was using 5.5 gram sliders the first time (when I could only get 15 mph). Went to 6g and got way better top speed than 5.5g but still way slower than stock. 6g and 1500 rpm spring was a slight improvement on hills but not much and it cost me quite a bit on top end speed (wife is much faster on her identical stock bike and we used to be same speed. Hill climbing improvements I received aren’t nearly worth the top end improvement I received).
I think I’ll race the wife with 6g roller sliders and stock torque spring and see if it is better. Original goal was to improve hill climb speed from embarrassing to okay’ish without losing top end. Was told the 6g and 1500 spring would do the trick but it didn’t.
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Post by aeroxbud on Jul 7, 2019 8:45:54 GMT -5
As long As the belt isn't slipping, just use the stock spring.
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Post by SMALL CC TEK on Jul 7, 2019 14:03:28 GMT -5
As long As the belt isn't slipping, just use the stock spring. That's good advice . Get quality CDI box Moto force or Ban jing Naraku even , that seems to be the ticket when you start Modifying the kymco . Also look at that stock air filter from the factory they are over oiled hurts performance bad . I had them come back doing 15 or 20 mph because of it be for .. |
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Post by rogerdog23 on Jul 9, 2019 12:25:15 GMT -5
Appreciate the thoughts. What will a good CDI box do for me? Just clean the air filter somehow and not replace it?
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Post by SMALL CC TEK on Jul 9, 2019 16:18:04 GMT -5
If you have a air compressor or a friend has one just blow it out keep the tip of the air gun 3" 4" away from the filter and do both sides . you will have a hand full of oil by the end . A good CDI has a better curve built in to it so you will run a little hotter but your full advance will come in way quicker than your stock one does giving you more low and mid range pull and for longer and the rev limit will be higher than stock . Plus when you do your next steps you already have the ignition part worked out .
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