KymcoForum.com
Scooters - 50cc => Agility 50 => Topic started by: ostrichmilkman on June 13, 2011, 07:27:31 PM
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hey im sure people have asked this before but what options do i have for derestricting my agility 50 ? its restricted to 31 mph atm and its too slow.
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Hi,
This is only what I've picked up from reading this forum, so excuse mistakes. I'm sure I will be corrected by someone else if i'm wrong.
Probably the first and easiest thing to do, is the CDI cut, its free and seems to give 5-7mph extra. http://www.kymcoforum.com/index.php?topic=1639.0 (http://www.kymcoforum.com/index.php?topic=1639.0)
You can then get a smooth variator boss, new variator, lighter rollers.
You will probably need to change the main jet size to avoid running lean.
Brads
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good job brad . You can also do a search on the fourm and it well tell you everything you need to know.
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One that seems to be coming up lately is belt size, I am wondering if they use a slightly shorter belt on scoots with restricted variators. In my opinion it would be best to derestrict the variator first, more speed for the same engine revs.
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I was trying to help someone else out theother day, check out this link, if you havent already, and you will get some usefull info and even links to the parts you need.
http://www.kymcoforum.com/index.php?topic=4365.0 (http://www.kymcoforum.com/index.php?topic=4365.0)
If your not sure about anything just ask before you try it and someone will helpout with info.
Let us know how you get on with it. Good luck.
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the belt size has been stumping me i tried the 729 and i lost so much jump and acceleration i'm about to go back to the stock bando though i did gain about 4 or 5 mph.. i think i may try to find a wider 729 but my variator & contra spring gave me an extra 10 downhill so i can afford to lose that extra top end
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I havd both a 729 and a 732 coming as well as a genuine one. I expect the longer one to give me a quicker launch as well as increased top end.
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let me know how that 732 works out & do you still have your bendix in(wondering if it might hit)? but i think it would slow me launch as thats what the 729 did to me but when i got it it says on the side 729/17.5/30 which i doubt is enough to slow me too much but it could be
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My 732 should arrive today or tomorrow. a longer belt should run higher on the rear pulley unless the existing one is already at the highest point. I will gain a lot because my belt width is down to 15mm, the wear limit is 17.
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If you fit too long a belt wont it just ride up over the edge of the variator and rip to bits?
My belt hits the top of my variator now cos I magic markered a line on it to see how far it was rising and all the pn was off after a test run. Guess my belt length is ok then and a longer one would just come off at the variator?
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Yeah, too long will either hit on the casing or tear on the starter bendix, depending on whether your model has the exposed bendix. With mine the bendix is in a separate compartment, so too long a belt will bind on the casing. I have seen belts advertised for my model (ZX50) in both 729 and 732mm lengths. The only way I am going to find out if they work or not is to buy them and try them.
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Well I think I will stick with my stock length belt since it seems to be ok and the agility does have an exposed bendix.
Had maybe 1/2 cm to 3/4 cm of marker pen left on the outer variator face bit had no pen mark left at all on the inner variator itself. Unless I fitted a larger diameter variator my belt would come off.
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As long as you are polishing the outer edge of the moveable drive face, you are as good as you can go, (without a larger variator). The non moveable drive face is larger, you won't get to the outer edge of that one.
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Yup sid, thats where im at right now so at my belt length limit, no more speed to gain there then :'(
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Belt width also has a pronounced effect, a wider belt shifts the whole range "upward" (less acceleration from stop and a higher top speed)
So you'd better change one dimension at a time if you want to learn anything because a longer and narrower belt might give the same performance as a shorter & wider one (or the other way around, I'm too tired now to really think about which way it works)
When I fitted a new belt I had to put a few 0.5mm washers against the drive boss to achieve the same combination of acceleration and top speed as before (i've got plenty of top speed for the place where I live, and I like some extra kick "off the line").
As the belt wears, I can remove one washer at a time to keep the result within the same range...
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Im not goin to mess with my belt right now ive almost got my agility set up just right for what I want. Harder fly springs in the next few weeks and I think im there :)
Anyway my belt still looks good, may upgrade eventually to a kevlar belt with exact same dimesions as the one I have.
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i tried kevlar once in a chinese scooter... won't be doing that again.. it held up nicely for about 4000km didn't lose performance at all then one day it went pop on my way to work i had to take my clutch assembly completely apart to get the little pieces of kevlar cotton crap out it looked like black and gray cotton candy in there..
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Wont be going with kevlar then :o
Got other things on my mind now anyway, came off this morning taking a bend in the wet. Smashed footplate at the rear footrest, smashed mirror, few scrapes on front, sprained wrist and left some knee-skin on the road. Not happy. Bummer.
Time to hit ebay and look for a new footplate and mirror :'(
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By now I've heard so many of these stories about kevlar belts. It seems like an nice idea but in practice it obviously doesn't work.
@streido : it always sucks when you hit the physical limits of what your tyres will take. Good you're still here to tell..
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Thanks mono, my knee now looks like I got 3 kneecaps all swollen up. Think i'll need to ride home with my sore leg out straight, will look just like a Harley rider, lol, ;D
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i tried kevlar once in a chinese scooter... won't be doing that again.. it held up nicely for about 4000km didn't lose performance at all then one day it went pop on my way to work i had to take my clutch assembly completely apart to get the little pieces of kevlar cotton crap out it looked like black and gray cotton candy in there..
I've heard this is only a problem on the Chinese scoots? Even though most use the same gy6 engines as our AG 50's, the build quality and exact tolerances are not up to par on them. Can anyone confirm?
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Even when this would be the case, the fact that the plain rubber belts don't shred immediately in chinese scoots and the kevlar ones often seem to do, means that kevlar belts are simply less reliable.
As far as I know there is no reason to use kevlar belts other than marketing hype.
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Reading this reminded me of a discussion earlier, this may be of interest, wordslinger also links to another thread on the subject.
http://www.kymcoforum.com/index.php?topic=991.0 (http://www.kymcoforum.com/index.php?topic=991.0)
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what if you cut the boss down and then go with a thiner belt. but I would rather have a wider and stronger belt.
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@blue : cutting the boss down and using a thinner belt have the opposite effect, you're sure that's exactly what you meant to do at the same time ?
Most tuning parts for all mopeds and scoot that I owned in my life turned out to be of an inferior quality compared to the original parts.
My current aim is to use as little tuning parts as possible, only change the parts that really make a large difference and ignore all possibilities which don't add much power but involve using non-kymco parts or modifying Kymco parts...
I once fitted a sh**ty Malossi Torquedrive which rattled and leaked grease all over the place and didn't make enough difference to justify the annoyances, I tried cutting the CDI which made the engine run very rough but did not add the kick I was hoping for, and I have tried lots of small modifications to things like intake manifold and exhaust without noticable effect...
Tinkering and playing around can be fun but I will stick with the things that are proven to make a real difference (at least I guess I will... ;D ) My Agility now only has a 72cc big bore kit, a NCY T2 camshaft and a NCY Overdrive 2 variator and I'm quite happy with it.
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how did that camshaft work out for you? i've been considering getting one but i hadn't talked to anyone who had one.. install is no problem i'm quite handy and i've been into this motor quite a few times just wondering about results
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The NCY T2 camshaft adds some power to a big bore kit at medium and higher rpms, the difference is not as spectacular as changing the cylinder from 50cc to 72cc, but it's certainly noticable. (it is said to have little effect when used with a 50cc cylinder, but I didn't try that myself.)
I won't go back to the original one, even though the engine became a little less powerful at lower rpms and variator adjustment is somewhat more critical because of that, the gain at mid and high rpms makes it worthwile for me.
The T2's timing and lift are not as extreme as with some high-rpm racing camshafts though, it's still fairly mild tempered, smooth running and useful for normal driving compared to those. (I wouldn't choose a true racing camshaft for road use, people that need those would be better off buying a two-stroke bike IMHO anyway...)
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the gain at mid and high rpms makes it worthwile for me.
well that is exactly where i need that gain in power i have my cvt set up with a fairly light weight so i rev fairly high from stop all the way to full speed it stays very even around what sounds sorta like 4000 rpm till i hit 45mph then it starts to rev higher