Edit- solved the really loud noise... But I can still hear a noise that seems to be coming from the variator area. I have replaced variator and belt, so that rules out that possibility. What happen if a crankshaft bearing is going bad? Any suggestions were to look next? The noise sounds like rattle when it is idling and gets louder when under load. I thought it was slider chatter, but I have ruled that out with new weights and variator.
Hello everyone at the new forum! I have noticed that I have a new noise that is some type of rattle or belt slapping noise coming from the cvt. I have switched the belt to an old one as a test... And the belt seems like it is ok compared to the old one. I have cleaned and inspected the variator and weights. The only thing I have not touched is the clutch. My scoot has almost 5,000 miles on it, it is a tank tr16 150cc with 16" wheels. The noise happens when i accelerate quickly, and sometimes when I let off of the throttle. What does it sound like to you?
Gear oil is next on my list to change, I checked it on level ground and the fill hole still over-flowed oil when I opened it up. Oil is changed every 500 miles. I just changed oil this weekend and I did not see any metal shavings in it. I have not checked the valves lately, but they sound much louder if the gap is too large. This noise seems to happen when I am accelerating quickly or decelerating quickly, and it sounds like it is coming from cvt. when the cover is on and I am riding I hear it, and when I remove the cover it is louder...
I will take apart the clutch when I have time to inspect it... This noise has been gradually becoming more noticeable.
Tank TR16 150cc 16" wheels 11.5 / 12g sliders 106m & 35p Modified stock airbox w/ uni foam
Round roller weights can develop flat spots when worn and make a rattle sound like a bad bearing . I replaced mine at 5,500 miles as they just started to get flat spots but still ok with Dr Pulley sliders which not only perform and outlast rollers but much quieter too
I put 12g Dr. pulley sliders in when I got it new. How often should the slider weights be replaced?
I just don't want something to fail in the cvt... I'm trying to figure out the issue before it breaks something. I am familiar with the normal chatter from the sliders, but this is louder than usual.
should I be looking for anything other than broken springs in the clutch? Does anything need to be greased/ oiled in the clutch?
Tank TR16 150cc 16" wheels 11.5 / 12g sliders 106m & 35p Modified stock airbox w/ uni foam
I had the TV on and sound off of my laptop , will check out the video again . Yes the clutch shaft should be greased . I replaced my belt at 12,000 miles and the ramp guides as they had some wear . The sliders hardy any wear . I am now at 14,200 miles and it works great . I have heard and seen a weight fall out of the variator . If a clutch spring was broke I am sure you would notice it . Hoca makes a bb torque sheeve for the torque spring to sit on and the BBs prevent it from binding .
Inpspect and remove any dust in the casing , variator and clutch bell with compressed air just cover your face with a clean rag to prevent inhalation of the dust
Sounds more like a single roller bouneing around and not the whole lot of them. If it was your valves you would hear it at all rpms. This is just going up to wot and decel but only like one roller is having a problem sliding up and down the ramp. The clutch appears to be working great so is the Variator. maybe you put in a slider in wrong. Alleyoop
I had a noise kinda similar but not really and I swore it was CVT, changed the belt and it went away for a while before returning even worse. Ended up being loose exhaust. Doesn't seem like that's your case but I guess the point is it could be anything...
2015 Tao Tao Thunder - 83cc BBK, bigger carb, short ram intake, modified exhaust, emissions delete
I haven't had the time to take it apart yet...I previously inspected the sliders and everything looked normal.
Will it damage anything if I run the motor with the variator and belt off I might be able to determine if it is the clutch, belt, or variator that way...
Tank TR16 150cc 16" wheels 11.5 / 12g sliders 106m & 35p Modified stock airbox w/ uni foam
Couldn't hear anything over the valve clatter in the video. Gear oil should be changed with engine oil or at least every other engine oil change so you are quite a bit over due on that.
Since you mention that it happens mostly when accelerating quickly you could also be dealing with some pinging from bad gas. Try a tank of premium and see if that minimizes it and if so then give the fuel system a heavy does of Berrymans Total Fuel System Treatment, Lucas or Seafoam.
Tank has been out of business for about 4 years now so the bike has potentially sat unused for some time and could be prone to fuel system issues from that. How long have you had the bike and how many miles have you put on it in that time frame? Is it a daily driver or something that gets ridden only occasionially.
I found the problem! It was a crack in the exhaust heat shield. I took apart the cvt and ran the engine without the variator, belt and clutch. The bike still made the noise, i then tracked the noise to the cracked heat shield... I removed the shield and the noise is gone!
rocky- the bike is a daily driver, it has close to 5000 miles. The valve clearance is good, the noise is the chatter from the sliders.
Thanks to everyone for the help!
Tank TR16 150cc 16" wheels 11.5 / 12g sliders 106m & 35p Modified stock airbox w/ uni foam
Find out the cause of the vibration that shattered the exhaust shield. I let mine go and lost the entire muffler, rear fender, clutch and main bearings in the gear box due to that when I had my Lance (Znen) 150. Parts for Scooters had all the parts to fix it including all the bearings and seals for the gear box. The difference was like night and day. Not sure of the root cause but the end results was that the weights on the clutch shoes had begun to fracture putting it out of balance taking out the bearings on the input shaft to the gearbox with the vibration (felt like more of a buzzing under my feet) which is what fractured the muffler and fender mounts.
Last Edit: Mar 11, 2013 21:23:33 GMT -5 by rockynv
It could be the input shaft bearings in the gear box allowing the clutch to wobble or even the clutch getting out of balance. When my clutch shoes started fracturing the bearings had developed a bit of play. Replacing them and the clutch cured a lot.
..BAD TO THE BONE..
