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Post by Zino on Jul 26, 2020 7:04:48 GMT -5
I would agree you are the fastest 4 stroke I have seen . I think you are right about gears there is more room than conventional wisdom .
It all comes down to power and setting the trans right. I helped set up a prebug got the wrong gears that pushed us to 10 to 1 . I instead of sending them back swapped them in . After getting the trans right it still would wheelie. This set up had athena sport and a leo vince zx so just your basic sport set up.
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gutiwarrior
Scoot Enthusiast
Malaguti F12 Project Wife
Posts: 160
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Post by gutiwarrior on Jul 26, 2020 7:09:50 GMT -5
I got to start reading and seeing what’s going on. Just seeing your build. It’s all going to come down to cvt tuning and the bike. Obviously. My malaguti Warrior f18 which is considered a kymco dink will do 70 easy. No engine work. Just carb and cvt. Italians I guess....let me read up or see the bike and maybe we can pick each others brains.
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Post by rehabkymco on Jul 26, 2020 7:15:27 GMT -5
I would agree you are the fastest 4 stroke I have seen . I think you are right about gears there is more room than conventional wisdom . It all comes down to power and setting the trans right. I helped set up a prebug got the wrong gears that pushed us to 10 to 1 . I instead of sending them back swapped them in . After getting the trans right it still would wheelie. This set up had athena sport and a leo vince zx so just your basic sport set up. Thanks Zino, from what I've been seeing I am pretty much the fastest 4 stroke on the forum, at least in a 72cc setup. As for gears, when I had the 10.15 set in Becky it acceled just as fast as with the current 11.28. Just needed the trans set just right.
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Post by rehabkymco on Jul 26, 2020 7:35:11 GMT -5
I got to start reading and seeing what’s going on. Just seeing your build. It’s all going to come down to cvt tuning and the bike. Obviously. My malaguti Warrior f18 which is considered a kymco dink will do 70 easy. No engine work. Just carb and cvt. Italians I guess....let me read up or see the bike and maybe we can pick each others brains. Any time scooter brother, and thanks for the inspiration to keep driving for 70. Kym should be back to daily driver status by next weekend. Vari and belt should be here Tuesday. Gonna take my time breaking in this belt. Multiple short runs, all less then 15 minutes run time with an hour cooldowns until I have 40 miles or so on it. And NO more then 1/2 throttle. And gonna set the vari up as is out the box (39mm boss 8g rollers shimmed as needed) Can not afford to shred this belt. Cause none of the local shops have this belt on hand. Once the belt is broke in then CVT tuning. Over the next 4 to 6 weeks thou I'm hoping to have my 2t rebuilt. Looking at $500 going into that. Hence the reason for the caution.
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Post by cypher1982 on Jul 26, 2020 8:18:17 GMT -5
I'm glad you keep pursuing this. I dont see many other kyms on here. And being my first scoot a lot is learning and then obviously testing and retesting and adjusting. It does surprise me to see your carb setup, I would have thought it to me a bit small for what you have. But then again..I'm still learning the small engine stuff. It all about seeing what does what. Keep at it!
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Post by rehabkymco on Jul 26, 2020 8:32:52 GMT -5
I'm glad you keep pursuing this. I dont see many other kyms on here. And being my first scoot a lot is learning and then obviously testing and retesting and adjusting. It does surprise me to see your carb setup, I would have thought it to me a bit small for what you have. But then again..I'm still learning the small engine stuff. It all about seeing what does what. Keep at it! Agreed, it's a learning curve that I'm still on myself. CVK carbs are a bitch to tune. CVT tuning is also something to learn as well. If your trans isn't in tune then everything else you do won't give you the best results and could have one chasing their tail.
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Post by cypher1982 on Jul 26, 2020 8:38:22 GMT -5
I'm glad you keep pursuing this. I dont see many other kyms on here. And being my first scoot a lot is learning and then obviously testing and retesting and adjusting. It does surprise me to see your carb setup, I would have thought it to me a bit small for what you have. But then again..I'm still learning the small engine stuff. It all about seeing what does what. Keep at it! Agreed, it's a learning curve that I'm still on myself. CVK carbs are a bitch to tune. CVT tuning is also something to learn as well. If your trans isn't in tune then everything else you do won't give you the best results and could have one chasing their tail. Definitely agree, I didnt know a CV carb existed before I got my kym lol. But everything else is still stock. I figure that way it's still a controlled system while I attempt to get the engine in tune as best I can. Once that's good, the tune wont change with cvt mods or otherwise. I know you had listed mods earlier a bit but what intake system are you using? What exhaust? I still have stock exhaust and I know that's considered a nono with carb and airflow mods, so I'm wondering still if that's not giving me a bottle neck. But I've also read aftermarket pipes dont do a whole lot for us 4 strokes... and I dont wanna hack up my stock one as it's all in nice condition and just over 1k kms
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Post by rehabkymco on Jul 26, 2020 8:43:38 GMT -5
Agreed, it's a learning curve that I'm still on myself. CVK carbs are a bitch to tune. CVT tuning is also something to learn as well. If your trans isn't in tune then everything else you do won't give you the best results and could have one chasing their tail. Definitely agree, I didnt know a CV carb existed before I got my kym lol. But everything else is still stock. I figure that way it's still a controlled system while I attempt to get the engine in tune as best I can. Once that's good, the tune wont change with cvt mods or otherwise. Actually you should get the trans in tune first. You could be chasing things with the carb all because your trans isn't in tune. And NO they are not in perfect tune stock, so far from it for max performance actually. Barely tuned for the 35 mph crusing they are intended for
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Post by rehabkymco on Jul 26, 2020 8:52:14 GMT -5
cypher1982 this is my pipe. And the modded area that was needed because generic pipes don't fit the Agilitys at both mount points. My pipe as been lengthened and braced because it's only held by the upper mount point. It's from Scooters to Go. The black tube from the carb is off the stock airbox. My intake mani is the stock one just dremeled out to 19mm on the engine side.
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Post by rehabkymco on Jul 27, 2020 3:47:05 GMT -5
Well this early bird may have found a worm.lol. Ive got this 83cc Airsal build on my mind. Found out the NCY store has Hoca big valve set(21.5/19)for 64mm head for 22.50 + shipping. Need to call a couple machine shops and find out if they could cut the seats in my stock head for these valves. I have a set of the same size 69mm valves in a broken 50mm head (spark plug hole stripped out and I'm not smart enough to fix it) that id love to put in a 69mm stock 50cc head. Or find a 47mm chamber BVH, then I woke up. Lol.
Anyways as I was looking threw the NCY store I seen these Taida valve springs, 11k and 12k rpm capable. Makes me wonder if they are actually good for them rpms. I've had my stock dual springs at 10,500 way back a year ago. And don't think the valves floated. Even with the STG A9 cam. Does anybody use these springs and are they worth the money. I already know that titanium retainers are worth it but they do wear out quite quickly.
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Post by rehabkymco on Jul 28, 2020 16:45:04 GMT -5
All my pretty parts came in. Now I gotta figure out how to remove these starter bendix bushings out of the case and cover so I can put the new ones in. Specs on this vari, Universal parts "performance" 89mm diameter 8g rollers 39mm drive boss Gonna put it together just as so with the 738 18 28 Naraku belt. Will update on shimming or changes when I get it on.
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Post by rehabkymco on Jul 28, 2020 19:20:35 GMT -5
Got it back together. But if it wasn't for bad luck wouldn't have none at all. Do to not getting the bushing seated all the way, the bendix started binding and took teeth off my CNC faceplate 😖😤. Guess they are better used for kick start only. Time to break the belt in now. Gonna take the next couple of days to do it
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Post by rehabkymco on Jul 29, 2020 19:03:26 GMT -5
Got the next cylinder today and it's even better then I expected. It's a real Airsal branded Aluminum cylinder kit. SCORE
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Post by rehabkymco on Jul 30, 2020 16:47:56 GMT -5
More damn bad luck done ripped teeth of the aluminum and the steel variator face plates. And tore up another bendix. Even had the new bushing walk out the block. And to top it off I really think the crank is bent on the variator side cause the face and vari wobble up and down a noticeable amount spinning it over by hand.
Almost be easier to put another whole engine in it at this point. With the amount of Kymco only things I've found so far, such as the side covers and what I've been told by every scooter shop in my area
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Post by rehabkymco on Aug 3, 2020 5:22:44 GMT -5
Well I should be picking up a long case short block for Kym this weekend. Hopefully it will even have a kick starter. Plan to just drop my 72cc kit, carb and gears into it and ride. Did figure a couple things out about my current setup thou. Biggest being I've been at 10:1 gearing all this time (52/15 pri, 49/17 sec) and with the speeds I've hit that,according to the calc, is 10,300 rpm at 57.3mph. And that was with a 88mm vari and ill fitting 729 belt.
As long as the kicker works on this new engine I intend to just remove the bendix. That way I can use my "toothy" CNC face with the 89mm vari and 738 18 28 belt. I wanna see 60.
I may put this in the 4t performance as well, but if anyone is using the Adjustable type cheap clutches, such as the one from SSPG, what is the rpm engagement range. I'm looking for a clutch that would engage at or over 5500 rpm(current clutch with red 2k engages at 45-4800 rpm). I know they come with blue 1k springs, and theory dictates that I could use 1.5 or 2k springs with it as well.
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