|
|
Post by luciano136 on Sept 21, 2007 18:52:20 GMT -5
I just took my driving test again and have the impression the shaking at low speed has gotten worse with time. I don't notice any leaking anywhere (gear box was my first guess).
I also *think* the scoot is a little more noisy when accelerating (it kinda sounds like an electric scoot speeding up)...
Any ideas? Could the spark plug cause bad ignition orso? I have 3000mi on the original plug... Don't notice any performance loss ...
|
|
|
|
Post by Gary on Sept 22, 2007 9:53:59 GMT -5
My 150 also has a low speed wobble. With the scoot on the center stand and the wheeel turning at low speed, you can see that the wheel doesn't run true - it wobbles some some from side-to-side. Everything is tight and there isn't any excess play, so I think the rear axle is bent a little. I'm sure this should I could fix this, but haven't bothered. Handling above 15 - 20 mph doesn't seem to be affected.
|
|
|
|
Post by scooterollie on Sept 22, 2007 11:14:21 GMT -5
I think out of true wheels is more of a problem on Chinese scoots than many realize.
|
|
|
|
Post by Jacine on Sept 23, 2007 23:51:32 GMT -5
Not necessarily out of true wheels but out of balance. I rarely see balancing weights on the wheels. Also spoke wheels can be brought back into true by tightening the spokes, (an art).
|
|
|
|
Post by rerun2 on Sept 24, 2007 0:06:21 GMT -5
There have been a number of posts concerning 'dyna beads' to balance the shakes out, I have never tried them, but folks on here seem to think they work, and are a pretty cheap fix.
|
|
|
|
Post by Gary on Sept 24, 2007 16:43:57 GMT -5
Double check the nuts and bolts on the scooter, especially the rear axle nut. I had one of these come loose and fall off on my 150. Very exciting.
|
|
|
|
Post by luciano136 on Sept 24, 2007 21:12:23 GMT -5
Thanks for the replies so far. I almost feel like it might be engine related. Every now and then I will notice some 'sticky' throttle when taking off. The Scoot will hesitate somewhat in the first few mph and then will sort of shoot forward (not that dramatic but I don't have a better way of describing it...) I have no idea what to look for as I don't notice any leaks anywhere. Just want to make sure the piston doesn't shoot through the seat while going 50mph  |
|
|
|
Post by luciano136 on Sept 24, 2007 21:46:54 GMT -5
I just checked on the nut on the rear axle. Well, it is there LOL. I wanted to tighten it but I don't think I have a socket big enough?! Largest I have is 19mm.
Any ideas where to look next?
Also, I notice the shaking especially in the front at very low speed; not so much a back and forth wobble (like you would have from a loose wheel) but an up and down kinda shake as if the scoot has some trouble taking off....
|
|
|
|
Post by poohbear on Sept 24, 2007 22:51:49 GMT -5
Could it be a bad shock absorber? I don't know what you have in that regard on you scooter, but I have seen quite a few posts from folks that have them getting stuck, hung up, jammed, whatever, causing the thing to just not work... worth a look?
|
|
|
|
Post by luciano136 on Sept 24, 2007 23:15:25 GMT -5
Could it be a bad shock absorber? I don't know what you have in that regard on you scooter, but I have seen quite a few posts from folks that have them getting stuck, hung up, jammed, whatever, causing the thing to just not work... worth a look? Shocks work fine... |
|
|
|
Post by scooterollie on Sept 25, 2007 7:56:24 GMT -5
The rear wheel on the 150 I had did exactly the same thing. Checked the wheel and it was slightly out of round! Not talking about the tire, just the cast wheel. Like I said, I have seen other posts indicating the same problem, cured by a wheel replacement. With the swing arm type of suspension at the rear of our scoots, some movement when you gun the engine while on the center stand is normal and, like Jacine said, you NEVER see balance weights.
|
|
|
|
Post by luciano136 on Sept 25, 2007 10:46:52 GMT -5
Ok friends, I did some more troubleshooting on my way to work (it's about 20 miles so plenty of time to think and listen). * Sometimes the acceleration is a little sticky and you would get a little boost of power while holding the throttle constant * The noise I hear is definitely located in the back; I hear it when accelerating especially above 20mph * I don't hear any noise when releasing the throttle and letting the scooter roll Last night I also pushed the scoot forward and backwards because I thought maybe the rear break was causing some friction. Did get some noise pushing it backwards. Soooo, I *think* all these symptoms point to the gear box. Either it's running dry (although I didn't notice any leaks) or some metal shavings got in the gears? I'll take off the dreaded cover and flush the gear box fluid again and see if that changes anything. Not looking forward to this task (I hate the CVT cover with a passion ) but it's the only thing I can think of... What do you guys think? |
|
|
|
Post by luciano136 on Sept 25, 2007 10:48:28 GMT -5
The rear wheel on the 150 I had did exactly the same thing. Checked the wheel and it was slightly out of round! Not talking about the tire, just the cast wheel. Like I said, I have seen other posts indicating the same problem, cured by a wheel replacement. With the swing arm type of suspension at the rear of our scoots, some movement when you gun the engine while on the center stand is normal and, like Jacine said, you NEVER see balance weights. Interesting. Would I not hear the same noise without accelerating and just rolling if the wheel were out of whack? See my post above; did you get all these same symptoms? Thanks!! |
|
|
|
Post by Jacine on Sept 25, 2007 10:53:55 GMT -5
That throttle sticking, check you attachment of cables at the carb. May have come loose.
|
|
|
|
Post by luciano136 on Sept 25, 2007 11:05:13 GMT -5
That throttle sticking, check you attachment of cables at the carb. May have come loose. Would that cause some noise when accelerating? |
|
|
|
Post by Gary on Sept 25, 2007 15:50:43 GMT -5
Luciano -
Does the noise and shuddering occur primarily when accelerating from a dead stop? My scoot does some of that, especially when the scooter is cold. I believe the cause is the clutch. Instead of engaging smoothly, it sticks and slips a bit, causing a shudder and what feels like little bursts of speed. Another poster said he blew some dust out of his clutch and that cured the problem. I'm going to try that next time I change the gear oil.
In the mean time, I have a procedure that sems to keep the shudder away. After I frst start the scoot, I hold the brakes tightly and advance the throttle just enough to engage the clutch. I hold this for a few moments, then release the throttle. After I repeat this once or twice, the scoot accelerates from a dead stop with no shudder and no noise.
Not sure why the procedure works. Perhaps it just warms up the clutch, or blows the dust out, or maybe takes off some glazing on the clutch. Hopefully its not doing any harm.
good luck,
Gary
|
|
|
|
Post by luciano136 on Sept 25, 2007 16:16:38 GMT -5
Luciano - Does the noise and shuddering occur primarily when accelerating from a dead stop? My scoot does some of that, especially when the scooter is cold. I believe the cause is the clutch. Instead of engaging smoothly, it sticks and slips a bit, causing a shudder and what feels like little bursts of speed. Another poster said he blew some dust out of his clutch and that cured the problem. I'm going to try that next time I change the gear oil. In the mean time, I have a procedure that sems to keep the shudder away. After I frst start the scoot, I hold the brakes tightly and advance the throttle just enough to engage the clutch. I hold this for a few moments, then release the throttle. After I repeat this once or twice, the scoot accelerates from a dead stop with no shudder and no noise. Not sure why the procedure works. Perhaps it just warms up the clutch, or blows the dust out, or maybe takes off some glazing on the clutch. Hopefully its not doing any harm. good luck, Gary Hey Gary, As far as the shudder goes, you are right on. It happens from a dead stop or at crawling speed. It has always done that somewhat but it looks like it got a little worse than in the beginning. The thing that worries me most is the noise I hear and that happens mostly when accelerating above 15-20mph. It's like metal is rubbing and seems to get worse the more I speed up (kind of like an electric train accelerating) BUT I only hear it when accelerating. When I don't give it any throttle and roll along, the noise disappears. I guess the clutch could also have something to do with that. Also (and this might be completely unrelated), the noise kinda started after having to make an emergency stop (braking hard with a little skidding). Clutch might be a good pointer though. Where exactly is it located? Easy access when I remove the cover? Thanks so much for all the tips! |
|
|
|
Post by Gary on Sept 25, 2007 20:33:19 GMT -5
Yes, when the clutch chatters it sounds like gears grinding. Not very pleasant. Try my warm up procedure and see if it doesn't help. And of course, the clutch is under your beloved cover.
Gary
|
|
|
|
Post by luciano136 on Sept 25, 2007 21:33:36 GMT -5
Yes, when the clutch chatters it sounds like gears grinding. Not very pleasant. Try my warm up procedure and see if it doesn't help. And of course, the clutch is under your beloved cover. Gary Hey Gary, I removed the cover and had someone give it some good throttle and after a certain speed, some painful metal noise can be heard. It looks like the rear wheel might have some play and cause the problem. I'll see if I can fix it by loosening and re-tightening rear axle nut... |
|
|
|
Post by luciano136 on Sept 25, 2007 23:02:05 GMT -5
Well, I broke it  . I thought I would tighten the rear axle bolt to torque spec and I broke the drive pulley on the clutch. You know the round thing with the holes in it depicted in the picture below. It can now rotate freely without the rear wheel moving. In other words, you can give it throttle and not go anywhere. I probably broke the pivot pins (or whatever the name is), sigh.... I'm not sure what to do as I don't have a trailer to get the scoot to a shop. Damn chinacrap! It's back to the car  I just past the freakin' motorcycle test and now this happens...  |
|
. I thought I would tighten the rear axle bolt to torque spec and I broke the drive pulley on the clutch. You know the round thing with the holes in it depicted in the picture below. It can now rotate freely without the rear wheel moving. In other words, you can give it throttle and not go anywhere.