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Post by 49cctaotaothunder on Oct 24, 2017 18:19:46 GMT -5
The scooter is stock and brand new. It idles well and has good pickup from a stop. A week ago it just ran stronger on hills and faster at top speed. What happened??? It seemed to have a little more torque on hills and either more RPM at high speed or a faster top speed. I did not adjust anything, but I can't figure out what would cause this slight loss of top rpm and speed. I have been driving over weight and up hills would this stretch the belt? It does not seem like it is lacking fuel.
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Post by jackrides on Oct 25, 2017 3:49:13 GMT -5
Same gas as before? Too soon for top speed runs, break it in.
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Post by humanshield on Oct 25, 2017 4:39:18 GMT -5
I have to agree with Jackrides above.
The first 500 miles are "break-in" miles. During that time it is normal for the engine to run hotter due to parts mating. Running it that hard early on could result in some damage that could lower compression. Lower compression would feel like you describe.
Typically, that damage would include scuffed pistons, some accelerated wear of the cylinder wall and piston ring damage. Usually that kind of damage is not recoverable and the engine will simply be "less capable" for the rest of it's life unless you change out the cylinder, piston and rings and break it in properly.
The way to determine if this damage has occurred is a compression test.
On a positive note, I seriously doubt you stretched the belt.
That said, there is a phenomenon called "expectation fatigue". The scooter "could" be performing exactly the same but your expectations (without you even being aware of it) are exceeding the reality of the scooters performance.
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Post by 49cctaotaothunder on Oct 25, 2017 15:11:48 GMT -5
I checked the compression and got 155psi. Can anyone tell me what it should be the manual does not. TaoTao Thunder 49cc 1p39qmb. Thanks for any info. I know if this were a 4 stroke lawnmower it would be good. Thanks
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Post by uglo on Oct 25, 2017 17:53:13 GMT -5
If you figure this one out let me know. I've went through 2 big bore kits a d have battled the same exact problem. Get to my final gear and it just sits in a lull. I can rev to around 8k through my other gears but it's like she runs out of power at top speed.. which I know she's got more because of all the performance crap on it! All tuned properly.. plug looks good.. just have no idea..
With that little mileage it seems abnormal to have such a tremendous loss in speed. I will tell you though.. my taotao 50 is a 2017 and had 26 miles on it when I bought it.
The cvt cover design is garbage and 1300 miles later I've realized that the covers design will actually cause my belt to scrape metal.. thus losing material and making it skinnier. With loss of belt material comes a lot of dust.. dust means degree in between my clutch bell and pad which has been causing glazing.. and makes my rollers wear flat spots at an alarming rate.
Open your cvt cover.. check for a ton of black dust and measure the width of your belt. Chances are if you've got a ton of dust.. you'll havenglazed clutch pads and flat spot on your rollers. That's where I would start first!
Let me know how it goes!
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Post by 49cctaotaothunder on Oct 25, 2017 18:00:28 GMT -5
Thanks for the help already pulled the clutch cover, just a little bit of dust the belt looks brand new. I pulled the variator and checked the rollers they look good, but I didn't quite know what to look for. I noticed the splines look very fine compared to some of the videos I saw on youtube. I hope the variator is not slipping on the spline. I thought about that after the fact. The compression is good right 155psi ??
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Post by uglo on Oct 25, 2017 22:42:00 GMT -5
155 is ok. I'd have to attribute it to a bit of wear on belt and rollers. Is it still bone stock? Has the weather gotten much colder over the last week?
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Post by lostforawhile on Oct 25, 2017 22:50:13 GMT -5
I have to agree with Jackrides above. The first 500 miles are "break-in" miles. During that time it is normal for the engine to run hotter due to parts mating. Running it that hard early on could result in some damage that could lower compression. Lower compression would feel like you describe. Typically, that damage would include scuffed pistons, some accelerated wear of the cylinder wall and piston ring damage. Usually that kind of damage is not recoverable and the engine will simply be "less capable" for the rest of it's life unless you change out the cylinder, piston and rings and break it in properly. The way to determine if this damage has occurred is a compression test. On a positive note, I seriously doubt you stretched the belt. That said, there is a phenomenon called "expectation fatigue". The scooter "could" be performing exactly the same but your expectations (without you even being aware of it) are exceeding the reality of the scooters performance. if it's a factory belt, it's very possible it could be stretched, the chinese belts they come with are really cheap when I get mine running again, I bought a gates powerlink belt, we will see how it works, the average price of those is about 30 bucks |
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Post by uglo on Oct 26, 2017 9:00:23 GMT -5
I'm waiting on a gates right now actually. Excited to test. I've only been running the crappy 8 dollar ones off Amazon.
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Post by 49cctaotaothunder on Oct 26, 2017 18:28:17 GMT -5
I pulled the cvt cover and the belt shows some signs of glazing on the edges, so I ordered a gates powerlink. The OEM is 729 17.7 30 but the gates is a 729 17.5 30, but it should be close enough and I want the quality and reliability of the Gates belt as well.
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Post by pinkscoot on Oct 26, 2017 19:40:00 GMT -5
The narrower belt make keep the belt from getting to the top of the variator. Then again it might and put it in a better location at the bottom.
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Post by cagiva4ever on Oct 27, 2017 2:49:47 GMT -5
as the scooter is so new (what ever 2 wheel vehicle) it/thye commonly needs every vital bolt/nut to be Torq checked at 500-kilometres (1st warranty service, Check in)
would not be rare if your Zaust manifols is loosened leaking, same for Intake side parts.
and as it is China made, especially 139qmb Cylinder heads need Valve clearence adjustments "often".
also many 139qmb cylinder heads have very poor material Valve seats, especially the EXH seat gets pitted starts to leak......................
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Post by uglo on Oct 27, 2017 12:28:41 GMT -5
Yessir 49cc. I got mine the other day. I see you got the long case! It's amazing what a half of a millimeter does to speed when it comes to belts. That new belt will do the trick. Check your car often and make sure dust isn't building up. I actually cut out some of the inside of my cover upon discovering my belt had been rubbing ever so slightly.. dust build up is a big nono..
By the way.. this gates belt is Noticeably better build. I'm putting mine on today after work!
There are a lot of upgrades you can put on that beast foe power! Have fun with it.. I know I have been!
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Post by uglo on Oct 27, 2017 12:30:18 GMT -5
as the scooter is so new (what ever 2 wheel vehicle) it/thye commonly needs every vital bolt/nut to be Torq checked at 500-kilometres (1st warranty service, Check in) would not be rare if your Zaust manifols is loosened leaking, same for Intake side parts. and as it is China made, especially 139qmb Cylinder heads need Valve clearence adjustments "often". also many 139qmb cylinder heads have very poor material Valve seats, especially the EXH seat gets pitted starts to leak...................... Definitely things to look for for sure! Minor differences could be wear on your cvt.. bigger changes are definitely attributed to vacuum leaks.. exhaust leaks.. and of course valve clearances being too loose or tight. |
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