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Post by backroadbaron on Oct 8, 2017 10:58:09 GMT -5
I have a 2007 GY6 ZNEN 150T. I am trying to figure out the correct size belt for the scooter. The one on there just shredded to pieces so small, that there are no identifiable markings to read. I believe the CVT cover size is comparable to a "GY6 longcase". I'm guessing it is either the 835-20-30 or the 842-20-30? I am also concerned that because the belt was obliterated, could there be some other issue that caused it to fail that I should inspect? I appreciate any info. Thanks
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Post by toddmaples on Oct 8, 2017 14:37:24 GMT -5
I have a 2007 GY6 ZNEN 150T. I am trying to figure out the correct size belt for the scooter. The one on there just shredded to pieces so small, that there are no identifiable markings to read. I believe the CVT cover size is comparable to a "GY6 longcase". I'm guessing it is either the 835-20-30 or the 842-20-30? I am also concerned that because the belt was obliterated, could there be some other issue that caused it to fail that I should inspect? I appreciate any info. Thanks Inspect variator, rolllers, clutch, and torque sheave. Basically entire tranny. Pull it all apart, inspect, clean, replace worn parts, lube everything proerly, and get another few thousand km/mi outta it... |
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Post by tvnacman on Oct 9, 2017 19:11:57 GMT -5
what size wheels?
John
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Post by backroadbaron on Oct 10, 2017 17:22:04 GMT -5
They are 12" wheels (120/70-12)
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Post by chewbaca on Oct 11, 2017 10:44:39 GMT -5
It's the 842 belt
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Post by backroadbaron on Oct 19, 2017 8:49:19 GMT -5
842-20-30 belt is for 12" wheels
does that mean the 835-20-30 is for 13" wheels?
Thanks for the help!
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Post by chewbaca on Oct 19, 2017 10:08:16 GMT -5
The size of the belt is determined by long or short case
The size of the wheel is handled in the gear box
You can use the 835 belt in the long case
it's good for gas mileage and high speed cruising
but it really does bad at stop and go
Don't use the 842 in the short case it's to big and doesn't seat properly
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Post by pistonguy on Oct 19, 2017 10:17:06 GMT -5
842-20-30 belt is for 12" wheels does that mean the 835-20-30 is for 13" wheels? Thanks for the help! I have a Long Case with 13" Wheels and mine came with the 842, I immediately upgrade to a Gates 842 and that was 149hrs of run time ago.. |
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Post by seamus26 on Oct 23, 2017 3:09:53 GMT -5
Hey, read THIS THREAD. I have a 2013 ZNEN 150, and I ran into a problem with belt sizing. This is the belt I'm using and the one I have as a spare.  Hope that helps. |
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Post by hillbillybob on Oct 25, 2017 7:00:38 GMT -5
seamus26......Your belt number tells me you have 10' wheels, and that means a short case 150cc engine. backroadbaron's 12" wheels will not fit on a short case, so his is definitely a long case 150......the long case uses an 835-20-30......some prefer the 842-20-30.
I use the Gates Premium....part number PL30705 on my long case.
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Post by seamus26 on Oct 26, 2017 15:28:19 GMT -5
seamus26......Your belt number tells me you have 10' wheels, and that means a short case 150cc engine. backroadbaron's 12" wheels will not fit on a short case, so his is definitely a long case 150......the long case uses an 835-20-30......some prefer the 842-20-30. I use the Gates Premium....part number PL30705 on my long case. Yeppers. You're exactly right. And the wrong one that I got at the dealer was likely for the long case. |
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Post by backroadbaron on Oct 29, 2017 12:25:01 GMT -5
Here's an update and some observations: I purchased both the 835 and 842 premium Gates belts. Both belts fit the long case engine scooter. Each belt has its pros and cons:
835 pros: good going up hills, has more power.
835 cons: higher rpm's overall at lower speeds; top speed lower, probably worse gas mileage
842 pros: lower rpms: at WOT, Higher top speed; better gas mileage
842 con: Big hills. My scooter labors hard to get up them. Kind of like being in 10th gear on a 10 speed bicycle going up hill.
Separately, I have noticed brief power loss usually during WOT; unsure why? belt slipping? It 's only for a second, then picks up again-riding on level ground. Im hoping that goes away, but it has happened sporadically each time I ride (3 days on 842 belt as of this post)
In the end, I've decided to use 842 belt going forward. I ride about 30 miles a day round trip. Its nice to not be redlining as often. It has to be less stress on the motor as well. Maybe I can put some lighter rollers on to help me on the hills? If I figure out the brief power loss issue, I will update this post. Thank you for everyone's help!
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Post by chewbaca on Oct 29, 2017 17:34:00 GMT -5
I think you have that backwards
The 835 is the shorter belt and gives higher gear
And the 842 is longer and gives lower gear
And yes you can compensate for the change somewhat with veriator weight though the launch will never be as brisk with the short belt
If you have been using the longer belt for a while it can leave
A groove in the cams of the driven pulley
switching to the shorter belt means the rollers need to overcome the bump
this results in excessive squeezing of the belt and low power do to poor efficiency
Until you get over the hump
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Post by backroadbaron on Nov 2, 2017 5:25:21 GMT -5
Separately, I have noticed brief power loss usually during WOT; unsure why? belt slipping? It 's only for a second, then picks up again-riding on level ground. Im hoping that goes away, but it has happened sporadically each time I ride (3 days on 842 belt as of this post) Maybe I should be starting a new thread here but this power loss problem does not seem to be belt related, and is beginning to happen more consistently. When I am riding and usually at WOT around 7000-7500 rpms, the motor briefly loses power. Rpms drop down to 6000. Power comes back after a second or two but is sort of sporadic unless I reduce the throttle. If I am riding at 5000rpms, I never seem to have this problem. Is this a sign of engine failure? Besides changing the belt and rollers, the only other thing I've done is changed the oil since this started occurring. What are some of causes of this? Thanks for your help |
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Post by pistonguy on Nov 2, 2017 7:40:24 GMT -5
Hmm, WOT power loss, back off the throttle and she's better, When was the last time you adjusted the Valve Lash?
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