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Post by zummerrunner on Jul 1, 2020 23:12:38 GMT -5
So I’ve been dealing with a 2014 TaoTao Zummer. I purchased it used back in late 2016 not running. I ended up throwing a big bore kit in it and it lasted a few months. Sold the blown motor an let it sit till spring this year 2020. I purchased a new Gy6 50cc long case. I’ve had that installed the past few months with a high flow exhaust and air filter upgrade. The carb has the stock pilot jet I believe 32?* dont quote me. And currently a 94 main jet seemed to give me the best performance.(which isn’t much) The Zummer feels like a absolute dog compared to my buddy’s taotao VIP 50cc. It’s slower in all aspects down low/mid and high. I’ve played around with roller weights I’m currently running only 3 5g rollers and the stock clutch. Pick up is still slower then the VIP 50cc and still slower top speed. The Zummer also has upgraded CDI box and ignition coil. I tried a aftermarket clutch with 2k springs but the scooter ran worse...even with heavy roller weights. SOMEONE HELP! I’ve tried everything and I still get smoked by my buddy’s VIP 50cc he paid 200$ for😢! Thank you
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Post by zummerrunner on Jul 1, 2020 23:31:00 GMT -5
Also adding the scooter only does 15-20mph up hills and about 25mph on flat ground. I almost feel like the belts slipping but can’t really tell. The motor is very new. I’ve had the CVT apart many times belt looked good. I’m at a loss for what to do next?!?! I planned to do a BBK to gain even more speed but I’d like to get the scooter running properly before modding it anymore. It’s very very slow....
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Post by CrankingWithCG on Jul 2, 2020 2:08:12 GMT -5
Also adding the scooter only does 15-20mph up hills and about 25mph on flat ground. I almost feel like the belts slipping but can’t really tell. The motor is very new. I’ve had the CVT apart many times belt looked good. I’m at a loss for what to do next?!?! I planned to do a BBK to gain even more speed but I’d like to get the scooter running properly before modding it anymore. It’s very very slow.... How many miles? Tuning wise, im leaning to too rich on the needle or main jet. But if it's a really low mile motor, it probably needs to be broken in. Stock 50s arent too powerful to begin with, and beating on it when its not broken in isnt too good. They'll pick up more power as the rings start sealing better, and bearings start running smoother |
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Post by zummerrunner on Jul 2, 2020 9:48:37 GMT -5
I put the motor in with just over 600 kilometers. Now after yesterday’s ride I have about 1300km. So give or take 350-400 miles. Oil been changed....scooter just feels restricted. Starts first kick/electric start but runs like I weigh 500 pounds (I actually weigh 140lb so that isn’t the case). I know the scooter should be faster. I’ve owned many many gy6 50cc and can’t figure out why this ones lacking. My buddies TaoTao VIP 50cc beats me all around the board like I said above. He has faster lunch/pick up/ and pulls away from me on the top end.....on any surface he leaves me in the dust on hills. I’m stuck doing 14-17mph via gps...while he’s clearly doing 25+ up some steep inclines. I’m totally lost and tired of throwing money at it. That’s why I’m hear for some helpful advice. I know these scooters pretty well inside and out. But I’m stumped here. Scooter just seems like it doesn’t pull. 😕
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Post by zummerrunner on Jul 2, 2020 10:07:38 GMT -5
I ran the scooter with a 78 main jet when I originally got the new carb. It ran very lean (pipe started turning gold/ pops and flames on deceleration). I’ve since tried tuning it and found the 94 main jet worked well with the bigger intake and exhaust. I have not played with the needle clip position. It takes the scooter for ever to reach 30mph on flat ground. I’m going to try some more carb tuning later today maybe go back to a 90 main and see if I get any improvement. just want the scooter to be running healthy and pulll me in and out of traffic safely. Because as it stands it’s unsafe.
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Post by lunatuck on Jul 2, 2020 13:40:49 GMT -5
The main jet seems rich to me. It's bigger then my main jet in my 80cc BBK with pod filter. The 15MPH to 20MPH uphill doesn't surprise me or seem out of the norm, but the scoot should go about 30MPH on flats. I'd check the main jet for top speed on flats and then tune the CVT for hills.
That said, have you checked the valve lash? Bad valve spacing can cause issues like this.
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Post by zummerrunner on Jul 2, 2020 14:34:33 GMT -5
The main jet seems rich to me. It's bigger then my main jet in my 80cc BBK with pod filter. The 15MPH to 20MPH uphill doesn't surprise me or seem out of the norm, but the scoot should go about 30MPH on flats. I'd check the main jet for top speed on flats and then tune the CVT for hills.
That said, have you checked the valve lash? Bad valve spacing can cause issues like this.
I plan to try and switch a 90 main jet into it an see it’s any better. I have some partial break up rolling back into the throttle sometimes. As for the 15-20mph up hills it doesn’t feel right. My buddy can cruise right by me up a hill like I’m standing still on his stick TaoTao VIP with only a pod filter rest is stock. I almost can run faster then this thing goes up hills. Something definitely isn’t right. It’ll take me for ever to ready 30 and I’ll have a line of cars up my butt by the time it reaches the speed limit. As for the valve lash. I’ve checked them in the last 200 miles. I have no ticks or any slappage coming From the head/valve cover. Scooter starts right up no issues. Back to my buddy’s TaoTao VIP that’s faster then mine (everywhere) you can hear his valves ticking from over 20ft away. Yet he’s still faster. I’ve gone ahead and ordered a 80cc BBK / new pod filter and 1500rpm clutch springs. Hoping to wake this thing up? Just feels so so slow to me. I’ve owned over 20 of these scooters as I buy them broke and fix them up. But this one of course my (personal scooter) I can’t get to run anywhere as good as all the ones I’ve sold! 😅🙃 |
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Post by FrankenMech on Jul 2, 2020 19:32:02 GMT -5
It's when there are no ticks coming from the valves that trouble is present. Set the valves at .004", .005" is OK on the exhaust. I hear you know how, but check the videos on how to set the valves, you may be missing something.
There are videos here on how to tune a carb, check them out. Guessing is not part of tuning. Also be aware that the numbers on jets are not universal, they vary by manufacturer. What other people use is irrelevant. It is your scoot that matters.
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Post by zummerrunner on Jul 2, 2020 20:04:33 GMT -5
It's when there are no ticks coming from the valves that trouble is present. Set the valves at .004", .005" is OK on the exhaust. I hear you know how, but check the videos on how to set the valves, you may be missing something. There are videos here on how to tune a carb, check them out. Guessing is not part of tuning. Also be aware that the numbers on jets are not universal, they vary by manufacturer. What other people use is irrelevant. It is your scoot that matters. Awesome I appreciate your input I’ll will open the valve cover back up and recheck them. I’ve done valve adjustments countless times on these gy6 50cc. Pretty straight forward as long as your TDC and have a feeler gauge set. I installed a 90 main jet and the pilot is a 33 double checked this evening. The 90 main seemed to help a bit. Still breaks up coming back into throttle after being wide open. No major performance gain. Ether my valves are too tight or I have a serious CVT issue robbing me of power. The scooter gets up to about 20mph “decently” (my buddy‘a VIP 50cc still beats me.) It seems after 20mph the scooter just falls on its face and won’t rev out anymore. I have a digital tachometer installed and it won’t go past 7k. And when I go up hills I pretty much watch it fluctuate dropping lower then higher by a few hundred rpms. Down hills the thing has hit 48mph at 10,500rpms but as soon as it gets flat or semi incline the thing just slows back down To about 25-30 flat ground and anywhere from 10-18mph up hill (depending on the hill). I’m lost. I’ve had the carb and CVT cover off more times then I can count. I just want it dialed in 🤬! |
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Post by GrumpyUnk on Jul 3, 2020 10:20:18 GMT -5
I would check cam/valve timing. When one or more teeth off, you'll have no low end or no high end.
Itis possible for the maek on the flywheel to be off, so check the 'T' vs actual piston being at TDC(p4ncil in plug hole). Then check cam alignment.
tom
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Post by zummerrunner on Jul 3, 2020 12:25:05 GMT -5
Okay so I just checked the valve lash. Both intake and exhaust were a bit tight. Intake had no movement and the exhaust had barley any. They are now adjusted to .004 both intake and exhaust valves. I know hear the common tick and seems like scooter gained a little performance. After taking it on a test ride it does seem better but still not where it should be. Only seeing 20mph up hills still with RPMs not going over 7k. The pick up from a stop to about 20mph is decent. Seems like after initial take off when the CVT goes to a higher gear the scooter just plateaus on power and falls on its face struggling to reach 30mph + on flat ground. I’m open to all advice here! GY6 50cc Zummer with 90 main jet/aftermarket exhaust/intake/ blue Cdi box and orange ignition coil. I’m running only 4 5gram roller weights. I have a big bore kit coming next week. Just trying to solve why the scooter feels so slow before I install that and have bigger issues! Thanks for the help thus far🏁🏁
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Post by zummerrunner on Jul 3, 2020 12:26:02 GMT -5
I would check cam/valve timing. When one or more teeth off, you'll have no low end or no high end. Itis possible for the maek on the flywheel to be off, so check the 'T' vs actual piston being at TDC(p4ncil in plug hole). Then check cam alignment. tom Okay so I just checked the valve lash. Both intake and exhaust were a bit tight. Intake had no movement and the exhaust had barley any. They are now adjusted to .004 both intake and exhaust valves. I know hear the common tick and seems like scooter gained a little performance. After taking it on a test ride it does seem better but still not where it should be. Only seeing 20mph up hills still with RPMs not going over 7k. The pick up from a stop to about 20mph is decent. Seems like after initial take off when the CVT goes to a higher gear the scooter just plateaus on power and falls on its face struggling to reach 30mph + on flat ground. I’m open to all advice here! GY6 50cc Zummer with 90 main jet/aftermarket exhaust/intake/ blue Cdi box and orange ignition coil. I’m running only 4 5gram roller weights. I have a big bore kit coming next week. Just trying to solve why the scooter feels so slow before I install that and have bigger issues! Thanks for the help thus far🏁🏁 |
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Post by FrankenMech on Jul 3, 2020 13:37:02 GMT -5
Check that TDC mark and cam location. Throw that blue CDI in the trash. Put the stock intake back on. Put the carb back to stock. Put the stock rollers back in the CVT. Forget that BBK for the time being.
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Post by zummerrunner on Jul 3, 2020 16:04:49 GMT -5
Check that TDC mark and cam location. Throw that blue CDI in the trash. Put the stock intake back on. Put the carb back to stock. Put the stock rollers back in the CVT. Forget that BBK for the time being. When I adjusted the valves I made sure the piston was TDC and checked with a pencil as recommended above. The 3 marks on the cam were lined up and looked to spec. I then went ahead and adjusted the valves to .004. Why are you recommending going back to stock? I’m not a huge fan of the blue Cdi anyways. I have a few black ones and the orange model I can swap it out with. I’ve also thought about buying the NCY CDI but not sure if it’s worth the 40-50$. I Havnt had the stock air box on in years I’ll have to see if I can find it but I’m not positive I still have it. As for the CVT the scooter came with 6.5g rollers and would barely move. So I had some 5g laying around and I’m running 4 of those. You recommend putting it back to stock? To me performance felt worse with them. I feel the Zummer is a heavier built 50cc then most with the larger tires and all. |
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Post by lunatuck on Jul 3, 2020 16:07:34 GMT -5
Did you do sharpie test on the variator? Before dropping roller weight, you should ensure you're getting full travel to the top of the variator. It's also worth measuring the belt width and making sure it hasn't worn.
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