Strange vibrations (QingQi 200gy)

[Lao Jia Hou]

Which reminds me, I have a RR to do (thanks).

OMG - preemptive guess here ... some "genius" came up with a "yeah, it'll work" stator-replacement idea? Iron pipe in tire, magnets under fender?

We need the RR

[Lao Jia Hou]

probably want to check the cush drive on the rear sprocket, specially if the local "mechanics" have been adjusting the chain cos they usually adjust it too tight. not allowing for the large amount of travel on a dirt bike

shagged cush drive will give a low freq vibe and eventually shear the sproket bolts...

leaving you walking home

Makes sense - likely culprit that the village idiot ... errrr, i mean "mechanic" ... might not think about.

[corporal_clegg]

Thanks for the advice. The "mechanics" in the bike shop took turns driving the bike around the block and all came back saying there's nothing wrong with and wouldn't check the things I asked them to check (as advised above) I got out the manual and removed the rear wheel myself took a look inside and couldn't see anythiing amiss, not that I would have notice anyway. Maybe the wheels were off balance. I gave up anyway, I'm used to it already so not as orried about it anymore.
. The qingqi doesn't have a cush drive btw. I guess I'll just have to wait and hope that when it does give in I wont be too far from civilisation.

[Tall guy]

It is the wheel bearings. Once they start making noise, total failure is not far away.

[lukepell18]

Hi there, I recently had this on my shineray xy125gy and I found out that there was a loose nut on the bolt holding the bottom on the rear shock, and a bolt going through the swingarm, I would just recomend going over everything and making sure everything is tight, hope this helps and hope you find out what the problem is :)

[Rotortrash]

I had a similar problem with my Qingqi 200gy---- When I bought the bike, the "mechanics" I use that term very loosley, put the speedo drive on without any grease...the dry gearing in the drive started eating each other causing my bike to vibrate, and it came about suddenly as you described---might have a look there----It was amazing how many Kms I rode, before I had problems with it.... My speedo still worked, but the needle bounced a bit, and obviously, I had to replace the speedo drive....