CVT overheating and pre mature belt failure please help!!!!

[drew5150]

So I just bought an off brand scooter, it has a gy6 50cc engine. I have had replaced variator replaced which was missing a guide. I was told by the guy who installed it at the scooter shop that there doesn't need to be any washers or spacers in between the variator components. However, I am worried about belt alignment and functionality. When I run the scoot for about 30 mins or so the CVT cover is on fire. I don't know exactly how much heat is acceptable. But it seems like it would surely cause belt a belt failure soon. The first belt broke presumably due to the missing variator guide. After it was replaced the scoot runs well however I am worried about the heat. I plan on dissembling the clutch and replacing if necessary. When I have the bike on the center stand and rotate the throttle everything is smooth but once it opens up into high range the bike vibrates so bad the whole bike starts sliding around on the concrete while still on the stand. I think the rear clutch assembly may have bad bearings and upon inspection I will replace. Hopefully the crank bearing isnt shot, I have yet to be able to check for play in the shaft but I will tomorrow. As far as reliability should I keep with a stock clutch assembly or would a performance clutch be okay for long rides, about 30 miles or so? Any recommendations on clutches? Also I wonder if the contra spring is to stiff for this scoot. But most of my heat seems to be around the variator side of the CVT cover after a long ride. Its about 40-50 degress here so wouldn't think environmental heat would play to much into effect. The clutch side of the CVT cover is rather hot too but not as hot as the variator side. The guy impacted the sh** out of the variator nut, Could it be to tight? Im genuinly worried about reliability and if the the variator assembly is not aligned properly due to incorrect installation, thanks for any help in advance!!

[3strokeengine]

Mar 27, 2018 16:54:09 GMT -5 drew5150 said:

So I just bought an off brand scooter, it has a gy6 50cc engine. I have had replaced variator replaced which was missing a guide. I was told by the guy who installed it at the scooter shop that there doesn't need to be any washers or spacers in between the variator components. However, I am worried about belt alignment and functionality. When I run the scoot for about 30 mins or so the CVT cover is on fire. I don't know exactly how much heat is acceptable. But it seems like it would surely cause belt a belt failure soon. The first belt broke presumably due to the missing variator guide. After it was replaced the scoot runs well however I am worried about the heat. I plan on dissembling the clutch and replacing if necessary. When I have the bike on the center stand and rotate the throttle everything is smooth but once it opens up into high range the bike vibrates so bad the whole bike starts sliding around on the concrete while still on the stand. I think the rear clutch assembly may have bad bearings and upon inspection I will replace. Hopefully the crank bearing isnt shot, I have yet to be able to check for play in the shaft but I will tomorrow. As far as reliability should I keep with a stock clutch assembly or would a performance clutch be okay for long rides, about 30 miles or so? Any recommendations on clutches? Also I wonder if the contra spring is to stiff for this scoot. But most of my heat seems to be around the variator side of the CVT cover after a long ride. Its about 40-50 degress here so wouldn't think environmental heat would play to much into effect. The clutch side of the CVT cover is rather hot too but not as hot as the variator side. The guy impacted the sh** out of the variator nut, Could it be to tight? Im genuinly worried about reliability and if the the variator assembly is not aligned properly due to incorrect installation, thanks for any help in advance!!

It seems all these gy6 scooters both 50cc and 150cc shake and try to slide on the center stand at high rpm free reving, so i wouldnt be too worried about that.

As for the CVT cover how hot are we talking? Its going to be about the same temperature as the engine block given they're bolted together. Also the CVT transmission puts off a BUNCH of heat aswell and the CVT cover is being a heatsink for all that heat.

Now if its some 300 degrees then yeah obviously somethings wrong

[lilpinny]

Yeah. Speaking for the 150 GY6, it shakes like a mofo. It'll shake all the bolts loose and make your Johnson go numb. Not surprised a 50 Would shake on the center stand. I don't think the center was really designed to run at full throttle .

Again, speaking for the 150, it gets super hot. The way it's engineered is to run Uber hot. I wouldn't worry about it.

The 150 (again not familiar with the 50) is air cooled so it needs to.get some air. Running on the stand would heat it up. Also the plastics on the 150 version need to be there as they guide the air from the fan over the "fins" on the engine. The system won't work if you remove the plastics, the air will just go off into the ether. Not sure if the 50 has those. I'm guessing it's simmilar to the 150.

[90GTVert]

CVT covers are typically hot. I vent all of mine.
49ccscoot.proboards.com/thread/360/cvt-cooling


If the variator nut is on too tight, the main concern will be when it comes off next time and if the threads are still in good condition on the crank.

[jackrides]

Slow down on the replacements. Are the components stock? If so, skip replacements till you know what's going on. Tightness of any nut won't cause system failure. How many miles? What maint been done? Take a chill pill.
Isolate the particular issues. Tell more details.

[lilpinny]

Mar 27, 2018 22:50:17 GMT -5 jackrides said:

Slow down on the replacements. Are the components stock? If so, skip replacements till you know what's going on. Tightness of any nut won't cause system failure. How many miles? What maint been done? Take a chill pill.
Isolate the particular issues. Tell more details.

Yeah. Quit throwing parts at it. It's probably ok.

[benji]

Just put some cooling holes in the dang cvt cover! Haha. Here's a pic of mine.

See those two holes next to the Yamaha logo? I put those in and the cvt INSTANTLY dropped temp while riding. Makes my clutch work way better.

[Corrosion]

Here is a Swiss version, Imported of course.