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I took the variator fan off and left the belt on metal axle. Next day I woke up to work on the clutch side when I found this rubber ring laying on garage ground.

Do you know where the rubber ring with a circle in it go on the variator side? I didnt see it come off but I am thinking it goes right behind the variator fan.

Any ideas?

This message has been moved to 250cc and up Classroom (Chinese) by JR.

exactly .132 m on the ruler which is 132 mm just measured it in garage.

Wrong section should be 250cc section.

Well just popped off the cover and it looks like I have the Japensese 871x23x30. Keep in mind I have the 2007 250b

Another post from someone:

"22.5, 23 and even 24 widths are all the same width belt. it is just the different manufacturers and their nomenclature.
An 870 is the same as the 871.
871 length is still made, but for whatever reason, it wound up in short supply at this time. Your dealer didn't want to spend a lot of time trying to find one.
You can use the 856 on up to a longer belt as much as 896 in length, but the longest belts may have some belt slap against rhe CVT case. A longer belt results in a slightly higher top speed and a shorter belt results in a slightly slower top speed.
The manufacturers were putting on whatever belt they happen to be able to get when they were manufacturing the engines. I saw at least three different belt sizes on my scooter already."

Read more: scootdawg.proboards.com/index.cgi?action=display&board=200cc&thread=35738&page=1#352882#ixzz2BlwhIJ1d

870-22-30 belt for Linhai .powersportsmax.com/product_info.php/products_id/14311" rel="nofollow" target="_blank">.powersportsmax.com/product_info.php/products_id/14311

.motopartsmax.com/index.php/main_page/product_info/products_id/15711/cPath/21_144/eID/8" rel="nofollow" target="_blank">.motopartsmax.com/index.php/main_page/product_info/products_id/15711/cPath/21_144/eID/8

870-22-30 Belt for 250cc Linhai Yamaha Water Cooled Engine
Fit for Chinese 250cc Linhai Yamaha Water Cooled Engine Vehicle, e.g. Roketa MC-54-250B and other similar models


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Belt size for Roketa MC54-250B
Post by marinervella on Dec 9, 2010, 10:53pm

What's the correct belt size for a 2008 Roketa MC54-250B?
The belt on the bike is a Gates 856-23;
Roketa's parts breakdown calls for 870-22-30;


The reason I ask is that I hear a squealing sound every time I start from a stop -- the squeal continues until I'm moving about 10 MPH or let off on the throttle. It sure SOUNDS like a slipping belt, but I'm open to the possibility that it could be the clutch. I have carefully cleaned the belt, variator, and clutch surfaces with solvent, as well as buffing up the variator surfaces with fine steel wool. Also checked the rollers, which seem OK. On the center stand, the rear wheel turns pretty freely with no squeak. The bike has around 3000 miles on it, and the belt appears to be in good condition.

I'd appreciate any advice on correct belt size, or the likely cause of the noise if it might be something other than the belt. Thanks Dawgs!"


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