|
Post by princearic on Oct 3, 2008 1:05:55 GMT -5
Ok guys, I've try searching around but can't seem to find the thread I need. I run a mc54b with 1k miles on it now, and one thing just doesn't seem right. When I begin to accelerate on my scoot, it sounds like there's grinding coming from the gear case. (if you can call it that) It kinda sounds like to me that the belt is not as it should be, something's not catching or whatever, and the grinding is quite loud. (actually embarassingly loud) Any thoughts on what's causing this and if it's something minor that can be fixed by chance?
|
|
|
Post by leo on Oct 3, 2008 2:35:23 GMT -5
when was the last time you checked your gear oil?
|
|
|
Post by petedeltona on Oct 3, 2008 2:42:47 GMT -5
doesnt sound good to me. if i were you i wouldnt ride it anymore. what ever the problem is its only going to get worse. if i were you i would take it apart to see whats going on or hire some-one thats qualified to look at it. the more you ride it , the more damage your doing to it and that means more repair cost if not replacement. i suspect yourbearings are shot .get it fixed at once in case it siezes up while your riding and throws you off.
|
|
|
Post by allworld on Oct 3, 2008 6:49:31 GMT -5
Hello princearic: Can you tell if the noise is the same or worse since you first noticed it? You have a 1000 miles so things should be running fairly smooth as compared when you first started riding it. I would change out the gear oil, in the "B" version, Linhai copy engine, you need .25L make sure that is what you put in, note that when you use a funnel to pure the oil add a little to compensate for the oil the coats the funnel. You may also want to remove the CVT cover and make sure everything under there is in good shape. You stated that it is only when you accelerate, so maybe you can keep your scooter up on the center stand and run it a bit with the cover off and try to pin point the problem, if there is a problem.
|
|
|
Post by sandman on Oct 3, 2008 7:58:36 GMT -5
Yes, the first thing I'd do is to take off the CVT cover so you can see once and for all whether it is an issu with the CVT or with the gear box. You should be hoping it is a CVT issue, since that will probably be an easier fix. I had a metal bushing come loose from something inside the CVT, and it ended up getting caught between the variator and the CVT cover, snapping about half of the metal airflow fins off the variator. Hopefully it is something simple like a foreign object or loose piece of metal clunking around in your variator.
Let us know what it turns out to be.
|
|
|
Post by unaggie on Oct 3, 2008 8:52:42 GMT -5
Check your clutch. The shoes (friction pads) are just glued on. While there, look inside the clutch for a little roller bearing that allows the clutch to ride on the drive shaft going into the gear box. That little bearing is pretty flimsy looking to me and has no grease seal. The original grease in mine was not too impressive. All this is a quick project and easily done.
If it is that roller bearing making the noise, checking this sooner is way better than waiting till later. Bearings are cheap. I don't know if you could even find all the parts needed to replace the damage done after it totally fails.
|
|
|
Post by "Big Guy" on Oct 3, 2008 9:08:38 GMT -5
Are you 'thin challenged'? YY250Ts are know for a slight knocking noise when taking off with a thin challenged person on board ;D
I have had two, the B and non-B version, and both have done the same thing under a load. I have gone through them several times and never could find any problem. The non-B went over 14K miles with no problems at all.
The only thing I could ever assume was either the gear tolerances in the transmission were not tight enough or the axles were not true enough... I don't of anyone who has ever found the problem, if in fact there is one. On mine, it wasn't loud, just a slight knock from the CVT on hard acceleration.
-Rich
|
|
|
Post by earlwb on Oct 3, 2008 10:12:05 GMT -5
heck and I thought it was the plastic panels vibrating myself.
|
|
|
Post by princearic on Oct 3, 2008 23:46:28 GMT -5
thanks for all the great responses. I'm not an expert mechanic so I'll give it a shot at taking a look at it if it's relatively simple. Otherwise I have a great shop down the street. I have the linhai clone (one thing I did forget to mention) and it does sound like a knocking noise. If I were to imagine something, I would think it was the belt struggling to crank something in a way. If anyone has ever run a riding lawnmower (and even some self propelled push types) and gotten that knocking/grinding noise kind of feeling just as you kicked it into gear, THAT'S getting in the neighborhood, at least that's what comes to mind when trying to find something similar. I'll keep ya'll posted though..
|
|
|
Post by czechmate on Oct 4, 2008 23:33:41 GMT -5
princearic, I have Linhai 300 and I also got a knocking noise coming from the engine/gear box area. I found out that the engine itself knocks on the plastic of the seat bucket. It happens only when I accelerate. There are visible marks in the plastic where the engine comes in contact with the plastic. I don't know how that is possible but since it's not getting worse and the scooter runs strong I don't worry about it too much. Your scooter might be different though. I was just thing that you may check that as well. Nik
|
|
|
Post by yarddogbbq on Oct 6, 2008 22:33:39 GMT -5
pull your clutch bell (have someone sit on bike and hold rear brake to remove the one nut) and remove the drive pulley clutch unit and grease the needle bearings in the rear of the drive pulley. here is a borrowed pic of the area to grease, this unit comes off easilly anyone can do this. remove the variator and check your rollers for light grease coating. will make smoother. check brake pads. and put a drop of oil on the brake swing pins. not much just a drop. so it doesnt sling. grease would be better on the pins but requires taking the clutch apart. use a moly grease or lithium or slick 50 grease with teflon.(i had some i used it 7000 miles ago bearing looks great.) sometimes the center stand bumper grinds on the cvt cover also. put a high quality gear oil in gear box. use a 90wt gear oil multi grade. or quality engine oil of at least 20w50 wt. yarddog
|
|