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Post by steve1297 on Aug 18, 2021 2:59:09 GMT -5
Brent, I know you had this issue on the Tao Tao. I haven't gotten through that thread to know if you've solved it. Mine starts at about 36mph, a wom.....wom, up to 40 it increases frequency, then decreases again after 40. I can hear it in your Tao Tao vids, Brent. Mine is the same. With a 52mm BBK, I imagine it intensified. This has caused multiple exhaust failures,broken studs, can coming off, etc. Even will loosen the intake studs.I have red loctite on everything now, and am praying. Anyone know what causes this? Any fixes?
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Post by scooter7878 on Aug 18, 2021 3:16:54 GMT -5
I get had that on mine I believe it was happening from the fuel mixture being a little off I'm not sure if it was rich or lean but mine was happening sometime and not others it seemed to be air temp related I've gotten mine to stop happening but I think at certain air temps the fuel ratio was slightly different I was playing with my jetting for a long time and once I settled at my current jet set up I don't get it any more. It was kinda exactly what u described it didn't feel like a miss or a rich sputter felt like a vibration or balance issue somewhere between 35 mph and 46 or so. Not sure if u have same issue but it made a noise like u described and felt exactly like something was out of balance. Usually didn't happen for the first 5 min of driving it happened more on hot days or after riding for a long time I down sized my main jet and was playing with needle hight and it's gone away I haven't gotten it in over a month now. Just a thought maby u have a similar problem I would have swore something was out balance
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Post by GrumpyUnk on Aug 18, 2021 10:12:58 GMT -5
...after riding for a long time ... on hot days....
If that is the case, it could be oil viscosity related. It could be CVT belt changing its length/width/slippery/grab factors. Unlikely brakes, could be tires. Previous is a swing at all possibles, maybe. If you are getting an actual 40+-50+ mph, the moving parts are going along at a very high rate compared to the 30 that is normal top speed. Do you have a tach to have a vague idea of the rpms you are turning? Could be you are feeling flywheel balance problems. {wrinkles brow} tom
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Post by scooter7878 on Aug 18, 2021 19:19:21 GMT -5
...after riding for a long time ... on hot days.... If that is the case, it could be oil viscosity related. It could be CVT belt changing its length/width/slippery/grab factors. Unlikely brakes, could be tires. Previous is a swing at all possibles, maybe. If you are getting an actual 40+-50+ mph, the moving parts are going along at a very high rate compared to the 30 that is normal top speed. Do you have a tach to have a vague idea of the rpms you are turning? Could be you are feeling flywheel balance problems. {wrinkles brow} tom . Tom if u were saying for me I got rid of my issue by a main jet change it's only Chang I made and it's been gone a long while now
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Post by steve1297 on Aug 19, 2021 7:12:08 GMT -5
...after riding for a long time ... on hot days.... If that is the case, it could be oil viscosity related. It could be CVT belt changing its length/width/slippery/grab factors. Unlikely brakes, could be tires. Previous is a swing at all possibles, maybe. If you are getting an actual 40+-50+ mph, the moving parts are going along at a very high rate compared to the 30 that is normal top speed. Do you have a tach to have a vague idea of the rpms you are turning? Could be you are feeling flywheel balance problems. {wrinkles brow} tom About 7000 rpm. But it happens at any rpm at that speed. I've messed with changing variator weights to lower and raise rpm
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Post by GrumpyUnk on Aug 20, 2021 8:33:19 GMT -5
If a jet change fixed the problem, then it could have been some sort of misfire under load at a specific flow rate(air coming through) of the carb. The carb transisions from idle-low speed-main as the rpms and flow increase. The flow increases as the needle is removed from the emulsifier also... Some combo was an 'unhappy' spot. tom
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Post by steve1297 on Oct 6, 2021 13:09:32 GMT -5
Just to update this. I changed the variator drive face to one of those Naraku red drive faces, and the vibration went away. But the scoot was more sluggish/felt under load with this drive face, so I didn't keep it on.
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Post by scooter7878 on Oct 6, 2021 14:01:08 GMT -5
Just to update this. I changed the variator drive face to one of those Naraku red drive faces, and the vibration went away. But the scoot was more sluggish/felt under load with this drive face, so I didn't keep it on. really I have that drive face with a naraku variator my puts power down how long did u leave it in it might need a break in period for the face and belt to wear together and the face to get kinda polished finish to grab better
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Post by Zino on Oct 6, 2021 17:52:30 GMT -5
Your new variator ramp angles are different so you need to adjust the weights a notch lighter so it revs up more before shifting.
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Post by steve1297 on Oct 16, 2021 6:30:09 GMT -5
Just to update this. I changed the variator drive face to one of those Naraku red drive faces, and the vibration went away. But the scoot was more sluggish/felt under load with this drive face, so I didn't keep it on. really I have that drive face with a naraku variator my puts power down how long did u leave it in it might need a break in period for the face and belt to wear together and the face to get kinda polished finish to grab better I will try letting it break in. I also got the naraku variator. Maybe those 2 together will work better? The Naraku variator just revs so high at speeds over 40. The RPM just skyrocket.
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Post by scooter7878 on Oct 16, 2021 13:29:32 GMT -5
really I have that drive face with a naraku variator my puts power down how long did u leave it in it might need a break in period for the face and belt to wear together and the face to get kinda polished finish to grab better I will try letting it break in. I also got the naraku variator. Maybe those 2 together will work better? The Naraku variator just revs so high at speeds over 40. The RPM just skyrocket. . I have the naraku variator also I use Dr pulley 7g sliders I hit around 10,000 rpm at wot @60mph with 49/17 gears. What weight are u running? And what contra spring? Rpm's don't scare me I've ran all my scoots around 10,000 even with stock cranks I never had one blow. Try sliders or if u don't have gears eBay seller scooters to go has pre pressed gears for 50 bucks it will give u around 7 to 10 more top speed so u will be able to keep ur revs a tad lower in cruising an
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Post by steve1297 on Oct 17, 2021 20:53:28 GMT -5
I will try letting it break in. I also got the naraku variator. Maybe those 2 together will work better? The Naraku variator just revs so high at speeds over 40. The RPM just skyrocket. . I have the naraku variator also I use Dr pulley 7g sliders I hit around 10,000 rpm at wot @60mph with 49/17 gears. What weight are u running? And what contra spring? Rpm's don't scare me I've ran all my scoots around 10,000 even with stock cranks I never had one blow. Try sliders or if u don't have gears eBay seller scooters to go has pre pressed gears for 50 bucks it will give u around 7 to 10 more top speed so u will be able to keep ur revs a tad lower in cruising an I'm running 9.5g sliders right now. I'm going to play around with the Naraku variator and drive face tomorrow, since I'm off. The RPM scare me a bit. I don't like to go over 8K. I haven't changed the gears. I'm going to change them out. That's why my top speed is 49mph
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Post by scooter7878 on Oct 17, 2021 21:08:30 GMT -5
. I have the naraku variator also I use Dr pulley 7g sliders I hit around 10,000 rpm at wot @60mph with 49/17 gears. What weight are u running? And what contra spring? Rpm's don't scare me I've ran all my scoots around 10,000 even with stock cranks I never had one blow. Try sliders or if u don't have gears eBay seller scooters to go has pre pressed gears for 50 bucks it will give u around 7 to 10 more top speed so u will be able to keep ur revs a tad lower in cruising an I'm running 9.5g sliders right now. I'm going to play around with the Naraku variator and drive face tomorrow, since I'm off. The RPM scare me a bit. I don't like to go over 8K. I haven't changed the gears. I'm going to change them out. That's why my top speed is 49mph . Also that variator and drive face is considered a racing variator and is made to run at higher rpm and like said above the ramp angles are different and probably not working well with the heavier sliders if I recall the variator comes with 5.5 g rollers so it's aimed at higher revs.
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Post by steve1297 on Oct 18, 2021 18:27:32 GMT -5
I'm running 9.5g sliders right now. I'm going to play around with the Naraku variator and drive face tomorrow, since I'm off. The RPM scare me a bit. I don't like to go over 8K. I haven't changed the gears. I'm going to change them out. That's why my top speed is 49mph . Also that variator and drive face is considered a racing variator and is made to run at higher rpm and like said above the ramp angles are different and probably not working well with the heavier sliders if I recall the variator comes with 5.5 g rollers so it's aimed at higher revs. Yeah. I think it came with 6.5g. I'll try those
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Post by steve1297 on Oct 18, 2021 19:24:35 GMT -5
Update. Installed the Naraku variator, and aluminum Naraku drive face, with 3 6.5g and 3 8g rollers. Vibration is gone. So happy. I guess those heavy steel drive faces are not balanced? I don't know .
But the Naraku drive face combined with the variator also keeps the RPM from jumping at 40+ mph. RPM stays steady.
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