ivand
Scoot Junior
Posts: 9
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Post by ivand on Dec 29, 2023 20:23:04 GMT -5
Hello  I am new to the moped scene and I just got myself a bug eye zuma. Just recently I installed a ncy exhaust, 1,500 rpm contra spring and the yellow springs from a Malossi oem performance clutch spring kit. My plans with this build are to do wheelies and mess around with my friends. Unfortunately I found that I cannot get enough power down to even pull up the wheelie, me weighing 130 lbs. I have concluded that it might be due to one or both of the 2 reasons listed below. If you guys could help me out either engine tuning or cvt tuning wise to allow me to wheelie the bike it would be awesome. Hypothesis #1 carburetor needs tuning: When I first start my zuma and it’s cold and I let’s say let it idle for about 15-20 seconds, and then take it out I can wheelie it. Once it starts to warm up I notice it gets very sluggish in the low end and loses the “grunt” it had when it was cold that allowed me to wheelie. I believe it MIGHT be that when it’s cold the choke is up allowing it to get more fuel and therefore run better? Or is this something in the cvt warming up and causing this? NOTE: This also occurred when the moped was bone stock. Now im not sure if this is the case, just an educated guess. I also believe it might be carb tuning becuase of the pipe I installed. I assume it would need some jets and an air box mod to support the improved exhaust flow. Would I need a bigger main jet/pilot jet or just bigger main. Also, if I need bigger jets, would I need to mod my air box? If so how would I go about doing so? Hypothesis #2 to stiff of clutch springs: After installing the yellow springs of the 29 7454 melosi oem clutch spring kit I began to read the manual it came with and I read the yellow springs were for “race” use and said to engage at 6,000 rpm. Do I need less stiff springs? For instance I rather install the white springs that are for “sports” use and said to engage at 4,500 rpm? OR is this something entirely different as In I need different weights in my variator? If you have any insite to why i can’t wheelie the bike please provide your input. I would greatly appreciate it as I know there are some experts in these forums. THANK YOU |
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Post by aeroxbud on Dec 30, 2023 4:39:34 GMT -5
You don't need a lot of power to wheelie a scooter. I used to know someone who could wheelie a four stroke Zip really well. Those are such a gutless bike.
If you have good technique, you could wheelie nearly anything. Loads of videos online. But you really need to get your weight over the back of the bike. Then pull up on the bars while accelerating.
Always cover the back brake.
You don't mention what pipe you have. But an expansion chamber pipe wouldn't help. As it makes power up higher in the rev range.
You don't need to mod the air box. But if you have a performance pipe, you will need to alter the jetting.
You really can't go far wrong with a sports 70 kit if you want that low end torque.
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ivand
Scoot Junior
Posts: 9
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Post by ivand on Dec 30, 2023 12:38:57 GMT -5
You don't need a lot of power to wheelie a scooter. I used to know someone who could wheelie a four stroke Zip really well. Those are such a gutless bike. If you have good technique, you could wheelie nearly anything. Loads of videos online. But you really need to get your weight over the back of the bike. Then pull up on the bars while accelerating. Always cover the back brake. You don't mention what pipe you have. But an expansion chamber pipe wouldn't help. As it makes power up higher in the rev range. You don't need to mod the air box. But if you have a performance pipe, you will need to alter the jetting. You really can't go far wrong with a sports 70 kit if you want that low end torque. The only thing is my zuma is a pretty heavy moped weighing around 200 lbs so it’s a lot of weight to throw up. I had mentioned in the beginning that I had installed a NCY pipe. |
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Post by Zino on Dec 30, 2023 13:20:31 GMT -5
If you are starting in the power band ,you just sit far back on the seat ,lean back and give a slight tug to do a wheelie If you have the ncy expansion pipe it will need the stiffer clutch springs to start in the power band I ran the malossi yellows or reds with a pipe . You want to feel power as soon as you hit the throttle wide open if you roll slow for 50 feet and then pick up speed try stiffer springs Did you put a bigger jet in the carb ? You need this for 2 reasons to feed the pipe because it runs at higher rpms and higher temps You also typically need to richen the needle by lowering the clip . Stock main jet is 80 Mikuni jets work in the stock carb typically 85 to 90 gets you in the right range . jetsrus.com/a_jet_kit_scooter/yamaha_50_zuma.htmDid you put lighter weights in the variator ? The pipe has a narrower and higher power band Zuma stock variator has 6 or 6.5 grams roller weights , you will need to be in the 5 to 5.5 gram range with a pipe to be in the power band . You want to feel power on and off throttle like a dirt bike if you have the right weights . |
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ivand
Scoot Junior
Posts: 9
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Post by ivand on Dec 30, 2023 14:39:21 GMT -5
If you are starting in the power band ,you just sit far back on the seat ,lean back and give a slight tug to do a wheelie If you have the ncy expansion pipe it will need the stiffer clutch springs to start in the power band I ran the malossi yellows or reds with a pipe . You want to feel power as soon as you hit the throttle wide open if you roll slow for 50 feet and then pick up speed try stiffer springs Did you put a bigger jet in the carb ? You need this for 2 reasons to feed the pipe because it runs at higher rpms and higher temps You also typically need to richen the needle by lowering the clip . Stock main jet is 80 Mikuni jets work in the stock carb typically 85 to 90 gets you in the right range . jetsrus.com/a_jet_kit_scooter/yamaha_50_zuma.htmDid you put lighter weights in the variator ? The pipe has a narrower and higher power band Zuma stock variator has 6 or 6.5 grams roller weights , you will need to be in the 5 to 5.5 gram range with a pipe to be in the power band . You want to feel power on and off throttle like a dirt bike if you have the right weights . I definitely don’t start in the power band; It’s sluggish at first, power band hits then power really comes on. Also, I haven’t changed any jets and upon opening my stock carb ,i found it’s running a 72 main (maybe too lean?) and my needle is non-adjustable; will I need a bigger pilot too?. After I buy jets will modifications need to be made to the air box? My vatiator weights are also stock so I will look into the weights you recommended. Should I just run all 5-5.5 g weights or should I pair it up with other weights? |
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Post by Zino on Dec 30, 2023 17:25:10 GMT -5
you must have a 2008 -2011 zuma with the restricted carb Advantages to 2008 best gearing of the bug eye disadvantages nonadjustable carb I used the vino pilot jet to richen up to make up for the non adjustable needle vino pilot jet 46 5BM-14353-23-00 is the yamaha part number Leave airbox as is It runs best like that You just need to seal the hole that came from the pollution control crap that went to the stock pipe Variator Try all 5.5 then try all 5's one will feel best and give you best Top speed . For setting variator weights Do high speed runs on the same stretch of road via gps on your phone track top speed and responsiveness run all stock weights for a baseline male notes like this 6 grams 40 mph sluggish on throttle off throttle 5.5 grams 40 mph spunky on and off throttle 5 grams 39 mph spunky on and off throttle You also can test the in between weights by running half and half for balance 6/5/6/5/6/5 I will bet the 5.5 are the ones that work best you have a restricted carb here is the fix www.zumasrus.com/zdox/ztip6.html |
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ivand
Scoot Junior
Posts: 9
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Post by ivand on Dec 31, 2023 13:23:38 GMT -5
you must have a 2008 -2011 zuma with the restricted carb Advantages to 2008 best gearing of the bug eye disadvantages nonadjustable carb I used the vino pilot jet to richen up to make up for the non adjustable needle vino pilot jet 46 5BM-14353-23-00 is the yamaha part number Leave airbox as is It runs best like that You just need to seal the hole that came from the pollution control crap that went to the stock pipe Variator Try all 5.5 then try all 5's one will feel best and give you best Top speed . For setting variator weights Do high speed runs on the same stretch of road via gps on your phone track top speed and responsiveness run all stock weights for a baseline male notes like this 6 grams 40 mph sluggish on throttle off throttle 5.5 grams 40 mph spunky on and off throttle 5 grams 39 mph spunky on and off throttle You also can test the in between weights by running half and half for balance 6/5/6/5/6/5 I will bet the 5.5 are the ones that work best you have a restricted carb here is the fix www.zumasrus.com/zdox/ztip6.htmlI already did the throttle mod so that is out of the way. For my variator weights, as a DIY method before I go out and buy weights, could I drill out the centers of them to decrease there weight?; I would obviously use the same drill bit for all of them, but I wanted to see if this is a viable at-home method. Another thing, u mentioned to plug the polution control pipe going to the exhaust, what about the other pipe coming from the air box that goes to another box above the cvt? Should I plug that pipe coming from the air box aswell? And what’s it’s pourppse anyway |
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Post by Zino on Dec 31, 2023 16:13:56 GMT -5
I get rid of that extra box on the cvt and its hoses it is does not have a use once you switch pipes
the purpose was to filter air to feed the catalytic converter in the stock pipe
Variator Weights .
What if you drill them down too far ,then you are stuck with a scooter that way over shoots the powerband.
Weights are so cheap .
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ivand
Scoot Junior
Posts: 9
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Post by ivand on Dec 31, 2023 17:23:12 GMT -5
I get rid of that extra box on the cvt and its hoses it is does not have a use once you switch pipes the purpose was to filter air to feed the catalytic converter in the stock pipe Variator Weights . What if you drill them down too far ,then you are stuck with a scooter that way over shoots the powerband. Weights are so cheap . Should I plug the hole where the extra hose coming out of the air box? Or should I stick a little screen/filter on it. And for the variator weights I plan on using a precision scale while trying to be as carful as possible not to take too much off |
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Post by aeroxbud on Dec 31, 2023 17:40:55 GMT -5
Yes plug the hole. It was only for the emissions system.
Rollers are cheap. I would just buy a couple of sets. If you try drilling them out, they may not be equally balanced.
Not something you want spinning round at 9,000rpm.
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Post by Zino on Dec 31, 2023 19:57:19 GMT -5
Plug the hole .
Extra air will cause you to run lean on fuel setting .
On these air cooled 2 strokes the mixture provides 80% of the cooling so you need it to be close to right or you could have engin3 failure.
If you want to run best in the transmission
Buy multiple weights so you can find the combo that works best.
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ivand
Scoot Junior
Posts: 9
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Post by ivand on Dec 31, 2023 23:52:58 GMT -5
Plug the hole . Extra air will cause you to run lean on fuel setting . On these air cooled 2 strokes the mixture provides 80% of the cooling so you need it to be close to right or you could have engin3 failure. If you want to run best in the transmission Buy multiple weights so you can find the combo that works best. You’re right I think buying actual weights would be a good reliable option 😅. Now last question, I just now bought a deltoro m6 jet kit. On the scooter swap shop states the size is for stock-17.5 mm carbs. Upon further research in forums, I found one person had issues with fitment of the m6 jets In his carb. Only thing is in earlier posts u had provided a link with the same specs as the jets I just bought. I will provide a link to the jet kit. Did I buy the correct jets, or did I screw up?  The jets I bought: scooterswapshop.com/collections/yamaha-zuma-02-11/products/dellorto-main-jet-kit?variant=12420118118497 |
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Post by Zino on Jan 1, 2024 0:07:01 GMT -5
I know the mikuni jets fit and what range of jets work best for a pipe and kit combo .
I just dont know if the dellorto jets fit .
If they fit
start way bigger than what I gave you for mikuni jets so you can find a safe tune
Your scoot should run crappy at wide open throttle
Work your way down until she runs clean and crisp.
Track your top speed as you work down in jets
I basically take the jet that gives me the best top speed by gps
If two jets run similar speed I take the bigger one for safety
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Post by Kagouras on Jan 2, 2024 13:40:29 GMT -5
You have a heavy bike but everything can pop the wheel up.
At first you need to set up the bike so its running good and you have responsiveness
For easy wheelie i will advice you this
First you find the right rpm that you will pull,after this you need to lean a bit towards your steering wheel and push the front suspension towards the earth.this way the suspension will come back with force and fully extend.wheel cant leave the ground if front suspension is not fully streched
Immediately after this you hit full throttle and pull with hands and hips
Wheelie is muscle mind connection
Just needs a lot of practise
Always fingers on brake or you will learn the hard way(i hope not)
I hope my english are understandable
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ivand
Scoot Junior
Posts: 9
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Post by ivand on Jan 2, 2024 20:54:31 GMT -5
You have a heavy bike but everything can pop the wheel up. At first you need to set up the bike so its running good and you have responsiveness For easy wheelie i will advice you this First you find the right rpm that you will pull,after this you need to lean a bit towards your steering wheel and push the front suspension towards the earth.this way the suspension will come back with force and fully extend.wheel cant leave the ground if front suspension is not fully streched Immediately after this you hit full throttle and pull with hands and hips Wheelie is muscle mind connection Just needs a lot of practise Always fingers on brake or you will learn the hard way(i hope not) I hope my english are understandable Your English is good I totally understand what you are saying! I know the basic techniques to perform a wheelie and I can do them on dirtbikes. I definitely still need to learn the specific techniques for a moped but I think my problem lies elsewhere. My low end acceleration is horrible and I thinks it’s Becuase of my jetting. Upon taking my spark plug out it was a tan color with a texture on it so i am guessing it is running really lean |
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I am new to the moped scene and I just got myself a bug eye zuma. Just recently I installed a ncy exhaust, 1,500 rpm contra spring and the yellow springs from a Malossi oem performance clutch spring kit. My plans with this build are to do wheelies and mess around with my friends. Unfortunately I found that I cannot get enough power down to even pull up the wheelie, me weighing 130 lbs. I have concluded that it might be due to one or both of the 2 reasons listed below. If you guys could help me out either engine tuning or cvt tuning wise to allow me to wheelie the bike it would be awesome. 
