KymcoForum.com
Scooters - 50cc => Agility 50 => Topic started by: hungryrussian on May 13, 2011, 05:16:19 PM
-
hey guys i'm not really new to scoots but i am new to the forum so let me introduce my scoot to start off, i drive a 2008 agility 4T with about 7000k on the clock. it was my first scoot but i blew it up a year or so ago running too lean (burnt a hole in my piston & scarred my cylinder pretty bad) so when my other scoot fell apart i decided to rebuild the kymco ;D. i installed a naraku 72cc kit from enviromoto, LeoVince handmade Titan exhaust, built a cold air intake out of the UNI filter that came in the kit and a peice of my original airbox tubing, and filed my main jet out to somewhere near a 110(not too sure but plug chops are coming out light tan) before the rebuild i had already cut the cdi and installed the unrestricted variator boss. i have been lurking around this awesome forum for quite some time during the rebuild and tuning afterward learning all types of stuff from you guys but i cannot seem to find an answer to the problem i'm having. the scoot has loads of power up to 40mph indicated but once it passes the 40 mark and heads toward the 70k mark it hits what feels like some sort of rev limiter >:( i know she's got a lot more in her because she'll hold 40mph up some pretty steep hills but she won't go farther than 70k even down hill any ideas? i'm sure i'm forgetting something simple here any help would be greatly appreciated!
-
Are you still using the stock variator? If you are that may be the problem, you could fit a race variator, think that may help but im no expert.
Only suggest this cos I had similair issues on my deresteicted scoot till I fitted my race variator, now hits 80+ downhill, 75-80 on the flat on my 50cc.
You can get the usual malossi or similair but I used a gy6 clone from taipai scooter assassins on ebay for £18 insted of near £60 for the malossi kit. Im happy with my scoot now. Maybe someone else can confirm if this sounds like your problem could be due to this? If you are still running a stock variator that is?
-
Check to see if your belt is running to the outer edge of your variator, you will see by the wear marks, shiny part. If not, you may be able to try a longer belt.
-
If you are still running a stock variator that is?
yes i am still running the stock variator, clutch, & belt i'm also thinking this could be the problem so i'll be ordering one as soon as i get my next check as i've been planning on purchasing one anyway. & sid i'll check the variator later today, would either of these transmission problems cause the popping sound i'm getting?
-
ok i pulled the cover & checked the wear pattern it looks like my belt is riding all the way up theres about a cm left untouched on the outside edge so i don't think that is the problem. i can post pics of it but i'm not too sure how to do that on here ???
-
If you can see a section that has no wear marks, that would signify the belt is not running to the top, that will cost you a lot of speed.
-
ok sounds like i need to pick up a slightly longer belt & try it out if nothing else it will eliminate that from the list if it's not the problem & non kevlar belts are fairly cheap & easy to find around here.. now to decide what lenght.. the research begins again :)
-
ok i went ahead and ordered the 729-17.7-30 belt slinger had on his a50 i'll see if that makes any difference i could use a new belt anyway(still running the stock one) i'll let yall know how that goes :) hopefully well but i'll be ordering either an ncy trans kit from enviromoto or digging deep for the multivar & some new clutch springs & whatnot next week
-
I don't want to be a wet blanket but, check out wordslinger's posts about the ncy clutch.
-
yea.. i just read up on that.. won't be going that route lol malossi it is then. you know of any good clutches out there because i ran my bike for a day or so with the beck brake over tightened so my clutch bell is a little discolored from heat because my clutch was slipping so i'm thinking i may need a new clutch eventually as well
-
I don't know of any personally, but malossi and polini are two good names. The saying goes you get what you pay for, but sometimes you pay for the name.
-
ok thanks for your help sid i'll be sure to update once i get my belt & decide on my trans parts i'm looking forward to hitting 50+ again ;D
-
got my new belt in today & threw 'er on. lost a little low end but not enough to bother me & i'm hoping to gain it back with a new variator eventually, but i gained about 20kph i am now hitting 75kph(46mph) indicated on flat & around 48mph down a good hill still holding 42mph uphill so i am fairly happy, still popping once it hits top speed but as long as i cruise at 1/4 throttle it goes away hopefully the variator will fix that problem gotta wait on a check for that bab boy anyone know where i can find a multivar? i'm having some trouble locating one everyone is out of stock :-[ also what are the dimensions of our variators? i'm gettin there ;D
-
Have a look through wordslinger's posts, he was looking at an overrange variator and posted the diameter of his stock one, though I don't remember what that was
-
thanks this overrange variator sounds pretty enticing :o i'll have to check that out
-
I don't know wether he ended up getting it or not, but I think he did post the size of the stock one. Might have to dig a bit to find it.
-
i looked couldn't find it word's got like 6000 posts lol but when i need it i can just measure mine dunno why i didn't think of that ;) but i just threw some 8 gram weights into my stock variator and it magically hits 50 on flat ground now? i'm loosing a lot of low end with the heavy weights & longer belt but i'm loving keeping up with traffic and it holds an easy 42-43 on slight uphill with the wind attacking me from the front, haven't had a chance to check hills out but i'll post after work got a nice curvy hill-filled run there & back ;D
-
i ran an average of 46 on my way from work and slightly faster on the way there i've lost a lot of low end but it's not enough for me to go back to 43 top speed my climbing is a little stronger if i'm already cruising but take-off from stop uphill is fairly dissapointing. i think i need some 6.5 or 7 gram rollers so i can get a happy medium but this will do until i can get my hands on a variator :)
-
Im sure you will feel a difference in acceleration thro the range with a race variator fitted, I know I did, my scoot runs much better since I fitted mine.
Now I just need change my contra and fly springs and im done tuning. For a while anyway at least.
-
thats the plan i get paid tuesday so ima order a variator & contra spring & while i've got the clutch apart i'll go ahead and try out my yellow leovince fly springs that came with my exhaust for some reason.. o well free parts are always awesome. i'm thinking about getting a variator tuning kit to find the right weight though since i jumped from 5.5 to 8 grams i want to find that perfect medium
-
I was running 5.5g rollers but decided to try 7.5g again today. Not happy at all now but cant be bothered changing back cos the rain just started.
I need a new clutch so I ordered that and also ordered new 1000rpm contra spring and a #85 main jet, should arrive mid week so going to try that in next weekend sincei needed the clutch anyway cos I saw I only have 2 clutch surfaces right now, the 3rd has come off somehow and is missing.
Will try with the 7.5g rollers then if no good put my 5.5g ones back in. Sure I read somewhere you can run 7-7.5g rollers using the tighter spring? Was going to go to 4.5g to try that a few weeks ago.
Once I get it perfect ill be happy, bit of a pain stripping it down all the time just now tho.
-
i've got electric and pneumatic impact wrenches so i've developed a system to get to my rollers within 30 seconds or so but it's still a pain tuning the transmission because once you test ride it you either have to let it cool for 15 minutes or break out the welding gloves.. and keep in mind rollers are a little hard to maneuver with gloves on lol i nearly lost one last time i tried that ;) i'm pretty sure i need a new clutch too so i'm going to order a stage6 clutch along with my variator and contra spring and of course get the set of 1000 1500 & 2000 rpm fly springs for tuning. i definitely do not like my take-off with these 8 gram rollers but it is the only way i can get it over 43 so i'm leaving them in for now. by the way a little off topic but anyone have a windshield? i'm considering getting one as it rains a lot in VA & the bugs are getting insane >:( but i'd like to know from someone that has one the pros and cons of a windshield on a scooter ;D
-
LOL, yeah already did the whole welders glove thing a few times now ;D
If you do find a cheap decent windshied that fits good canyou post up a link cos ive been looking for a while now for 1 for my agility?
-
most definitely i'm still shopping around now but once i get it i'll post a windshield thread
-
well... good and bad... i just installed my naraku hs variator and i love it :) acceleration is super smooth no hikes in revs no bogging or "problem rpm's" gained about 7mph over stock; now hitting 55ish indicated(buried speedo) but i'm still getting the popping/backfiring noise once it tops out and no matter what i do it will not go any faster.. i tried both of my belts, i'm beginning to think the stock cdi has a second rev limiter or something... :( oh well i'm very happy with 55 and thrilled with acceleration don't get me wrong i just know something is not right.. next step: contra & fly springs.. ima be flyinnn
-
Could it be the exhaust can exit enough gasses quick enough,causing the backfire and popping?
I would be too wary of breaking my scoot if it was bad popping/backfiring when riding. Take it you checked your not running too lean?
Great its now going so fast but i guess you cant fully enjoy it till you get to the root of the problem.
-
that's what i've been worrying about but i've been keeping it near 50 and staying at half throttle there so i only hear the popping noise once in a while and i immediately drop the throttle.. & yes i've done plug chops wot, half throttle and 1/4 throttle all come back light tan to medium tan except when it's humid then they're a little darker so lean is not the problem, i have an aftermarket leo vince exhaust with the restrictor removed so it's definitely not that, i love the speed but i hate the popping i've blown this engine once.. i don't plan on doing it again
-
well it looks like the yellow clutch springs and 1000rpm contra along with the stock 728x18x39 belt and 8 gram did the trick for now. i'm hitting 55 or so indicated downhill(which is slightly scary by the way :D) and holding 50 or so on flats scoot feels very very torquey compared to before and holds speed very nicely much smoother at every speed my cltch pads are worn to almost a mirror finish though so i think i may be loosing some jump but it'll spin tires in gravel on command which is kinda fun ;D i'll give it a nice long ride tomorrow to see how it's really performing i'm sure i've still some twaeking to do but this scoot has come a long long way
-
Good to hear it beginning to work out, nothing more annoying than something wrong that you cant solve.
I fittd my 1000 torque spring at the weekend, just ordered a fly spring set too to try them. Want to go 1500 flys to see how that goes, may drop to 1000 flys if its too jerky off the line, cos wife uses my scoot now and again to nip to the shops etc, if its sunny.
-
cos wife uses my scoot now and again to nip to the shops etc, if its sunny.
:) After having done a round of mods on my scoot, Mrs. Sid took it for a ride around the block one night, well, she was gone about a half hour. When she came back she said "you have taken a mild nannered scooter and turned it into a blood thirsty beast. She was having fun surprising car drivers at the traffic lights. :D
-
lol. My wife had the great idea that she could use the scooter all thro the summer, in the good weather, while I used the car. Come winter, and bad weather, she would have the car back and let me use my scooter, guess what my answer to that was? ???
All I will say is, I rode the scooter to work this morning! ;D women do get some crazy ideas at times.
-
yea my younger sister has gotten this idea in her head that since i'm teaching her to ride it i'm going to give it to her when she goes off to college.. maybe if she buys me an old s9 liquid cooled... but that'll never happen :-\