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Post by trouty56 on Jul 26, 2013 21:56:22 GMT -5
I recently installed a BBK in my little scooter. I have plenty of power now, enough for me, but when I hit 35 mph I start getting lots of noise and some vibration from the drive train. I rode a buddy's scooter and it was real smooth right up to it top speed. One thing we noticed was the difference in length from the variator to the clutch. Mine is shorter. Heck...I can get the scooter to 40 pretty easy now but it sounds like it will fly apart. less than 800 miles. Think I have a problem or is this scooter just too small....
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Post by scoots on Jul 26, 2013 23:06:22 GMT -5
try kevlar belt i kno mine was like that for awile but i bent my variator from getting a bolt off the wrong way  send pics |
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Post by trouty56 on Jul 27, 2013 4:50:53 GMT -5
Hey scoots...so did the belt help or was the it the bent bolt that caused your noise/vibration....I'll get pics of the variator area today...
There is also a whine noise that was not present on my buddy's scooter. I figured this was the belt.
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Post by freefour1968 on Jul 27, 2013 6:02:06 GMT -5
Whine noise probably belt , I got the same kind of vibration as it hits 40 it feels like its about to explode but it didn't used to. I went out today and for the culprit ....a loose motor mount bolt . It was the bolt attaching the motor mount bracket to the frame . Gave it a quarter turn and took it for a ride just a while ago and vibration is gone . Nice and smooth.
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Post by trouty56 on Jul 27, 2013 8:17:45 GMT -5
I checked any bolts....none were loose.....here is a very short vid to show the belt tension. Seems loose.....  |
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Post by trouty56 on Jul 27, 2013 9:16:49 GMT -5
Something else I want to mention.....when I turn the clutch bell the rear wheel turns but there is about 3/8 inch of slop on the outside circumference (I can turn the bell just a bit without the rear wheel moving)....I am estimating the play, however, I would think it to have less tolerance than that. But then I will see what others say....
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Post by sailracer on Jul 27, 2013 10:10:03 GMT -5
Wow you should'nt have slop or play in there at all! that's the input shaft to the final drive
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Post by trouty56 on Jul 27, 2013 10:34:49 GMT -5
Wow you should'nt have slop or play in there at all! that's the input shaft to the final drive Oh boy...where do I start....?? Drive gears??? |
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Post by trouty56 on Jul 27, 2013 20:28:54 GMT -5
Here is another short vid showing the clutch play.....  |
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Post by scoots on Jul 27, 2013 21:21:58 GMT -5
the belt heped the slack...try to tack ur clutch harder
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Post by skuttadawg on Jul 27, 2013 21:58:38 GMT -5
How many miles of the CVT ? With a BBK I would suggest a new belt too . Rollers will wear out and develop flat spots thus making them not roll like when new and round , Worn rollers do make a rattle noise like a bad bearing . My Echarm I replaced my rollers with DR Pulley sliders after reading on how many like them better than round rollers . First thing I noticed they are quiet , performance it a lot better , and they last so much longer than cheap OEM rollers . So far I have around 12k miles on mine and takeoff is better but I went from 75MPH to 70 MPH on top end as they have gotten lighter from wear . I changed my belt at 12k ( I have a meaty Honda V belt type instead of a thin belt like on the 50s ) and I went with a Kevlar Bando . The stock belt was still ok but had signs of wear and I replaced it to be safe . It is more fun to ride than push . I have read so many horror stories where a broke belt damaged the other parts and locked up the rear wheel . I also got new tires with the belt and I felt a vibration in the belt where the stock was always smooth . I also have the tires balanced which really cuts out a lot of vibration and bounce when going fast . I also replaced my Gates belt on my 2T with a Bando and it had the same vibration at times where the Gates did not . I have also read where a Kevalr belt can wear out the variator since the cords are stiffer than nonKevlar belts .
With a BBK you have more power so may may want to go up a gram or two in variator weights . If you find a roller weight that works for you get 1 gram heavier in sliders like Dr Pulley or Koso which I heard was good too . Balanced tires is beyond night and day improvement too .
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Post by rockynv on Jul 27, 2013 22:08:37 GMT -5
Kevlar belts can really dig in and damage the variator and clutch pullies so many avoid them. A good shop will refuse to install them.
Did you take the variator off when you installed the BBK? If so you may have not installed it correctly and have the spacers out of order as there appears to be too much slack in the belt. The belt looks fairly new in the vid but could have streatched. Are there any grooves on the variator faces? With the extra power you may be crossing over the groove worn in the drive faces where your prior max speed was. On small displacement scooters many are riding at max all the time so a grove gets worn where the belt rides on the pully the most and it will vibrate horribly when you have the power to run the belt up past that groove. If the groove is too deep then you will have the replace the variator and drive face otherwise the vibration can lead to other faikures of the drive train, bodywork and muffler.
1/16 to 3/16 of a turn is normal rotational play in the clutch bell however if you did not put fresh gear lube in before you first rode the bike and then changed it 300 miles ago then I would change it now, run it a few days to a week and then change it again.
More important if you push against it and pull out is there much movement? How about up/down and side to side? In either case it may be time to change the bearings.
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Post by paulgendek on Jul 27, 2013 22:10:44 GMT -5
For what it's worth, my belt is super tight, almost impossible to put back on without scraping my knuckles.
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Post by skuttadawg on Jul 27, 2013 22:14:34 GMT -5
I also replaced the the glide keys too . Good advice to grease the clutch shaft . I would remove the CVT and run in on the CS to see how far the belt travels . I would be on the other side of the CVT cover to be safe as I have heard of parts flying out and hurting people . A test run you should be ok while on the CS ( center stand ) but never ride with the CVT off
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Post by trouty56 on Jul 28, 2013 4:55:11 GMT -5
The battery was giving out in the laptop and my post was scrambled to beat heck....I reposted it.....
Going to try and sum all this up a bit......I really haven't put too many miles on the scooter....got it with 350 on it and it has about 700 on it now, I only had the variator off once....to put heavier rollers in it during the BBK install. The variator was pretty straight forward.....bolt off....face came off...one spacer......then the variator......pulled the rollers and put new in and back together.....are those little plastic things referred to as guides??
The noise/vibration was there since I got this bike. I kinda figured that they were just built that way until I rode a friends scooter...
I did change the gear oil when I got the scooter....I'll drain it and refill it...
The belt was this loose when I opened up the case to begin with.....I questioned it when reading about the tightness in another "popular" thread.
There are no grooves in either the variator face or the clutch and it looks like the belt rides maybe 3-4 mm from the edge of the variator...
Not comfortable running this thing with the cover off. I tried to start it the last time and the starter gear needs the support of the cover....I can see that flying off and.....well....not happening....
Balancing the tires,,,,these are 10 inch wheels...pretty small....could easily be out of balance....they are turning super fast....might have to look into this....
Thanks for the advice......
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