Sram Eagle back pedalling issue

Have sram eagle on a 2019 whyte t130. Gx with an x01 derailleur. In the 50 tooth it will drop the chain down the cassette if I back pedal, not an issue in reality but wondering what causes it, my 2018 t130 had the same drivetrain but it didn’t do this? It’s done it from new so nothing worn

Often happens if the chain is too long, and from experience of selling them, Whytes usually come with a chain that’s 2 links too long from experience (dunno why, I guess their factory ordered a load of chains all 2 links too long for some reason).

But take a pic of it in the 50 first and share it, before you just go removing 2 links, just in case it has already been done by the shop.

I had this it was a stiff jockey wheel.  Just hold the chain of each jockey wheel and spin it with your fingers to check.

I had this it was a stiff jockey wheel.

Stiff jockey wheel also wouldn’t help, nor would mech hanger out of line, worn chain/cassette, all the usual stuff. Sounds like the OP’s bike is pretty new though and I know Whytes tend to ship with a chain that’s too long which also contributes to it.

Are your jockey wheels on the right tooth (I just realised that they’re narrow-wide like the chainring)

Bike was new in February and its done it since day one so I opted it wouldn’t be down the wear. The jockey wheels spin fine but I’ll check the direction on them.
Chain lengh is somthing I never thought about, lesuire lakes built the bike, going of their work on other faults I found on a new bike I never much doubt they touched the chain lengh. I’ll get a picture later and try to upload later.
Thanks

Are your jockey wheels on the right tooth (I just realised that they’re narrow-wide like the chainring)

Every day’s a school day!

I dont have the OP’s issue with GX – but what other issues would having the jockey wheels mis-coupled cause? I take wheels off all the time to load in the car and the chain is flapping in the breeze for this. I cant believe I have accidentally always got them realigned every time. Or does it fix itself somehow?

I’ve never ran the chain and the n/w jockey of sync but I can imagine it would run like a dog and wear that jockey’s teeth pretty fast too.

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Hopefully this works. Never uploaded photos on here before.

Chain looks ok to me but I’ve only ever set my own bikes up. Zone habitual tinkerers or lbs guys will give you a better idea.

No expert here, but looks like I would expect. Still struggling with the concept of aligning n/w jockey wheels to chain. As Kneed above says, wheels always off for transport, I can’t believe it’s a real issue. How would a novice like me even know?

I moved the jockey wheel yeatersay to see what it’s like if it was a tooth out on the nw. The chain just sits on top of the wheel, you would know if it’s out as it would make a noise when pedalling