Vonnie

[Vonnie 52]

Hi all I’m desperate for help I have a ZHONGNENG 50cc automatic scooter.. but lately at junctions it’s been cutting out then struggles to start but it does.. been to a garage and had a diagnostic check all fine.. changed the exhaust.. but it’s still doing it.. now on my tank it says to fill with E10 but been advised to fill with E5.. will that stop the cutting out 

[RideWithStyles]

Hi and welcome.
great for you to get into biking but sorry you choose that Chinese bike.

anyway it Sounds like a fueling, ignition or a sensor sensor problem, possibly a cvt but really at first thought with little info one of the earlier problems.

i hate for e10 my own reasons but if its a new bike (whats its year?) that actually been designed for e10 from the off and its new without being choked up then thats not the reason.
Just be wary that your dealer might just feed you bs just so they don’t have to fill a claim and fix it…just saying.

Edited July 28, 2024 by RideWithStyles

[bonio]

Sorry for your troubles. 

Who's advised you to use E5? Can you ask them why they recommend it? If E5 does solve the issue, it would seem to me to point at something fundamentally wrong with the firing.

There are only so many things it can be: fuel delivery, air intake, exhaust (probably the least likely), and spark.

There'll be those here with more knowledge than me who can tell you what to check. But this is such a common problem with Chinese scoots, you will find the answers already set out for by doing a bit of a search.

 

[Vonnie 52]

Thanks for your replies… the mechanics said it runs better on E5..  I’ve had a new exhaust fitted…  

it only cuts out at the first couple of junctions then it’s fine

 

it was a new bike.. wouldn’t buy one again direct bikes are a nightmare to deal with… thanks for your replies

there’s a list of jobs I had done done to try n find the fault 

the mechanics were amazing 

Edited July 28, 2024 by Vonnie 52

[RideWithStyles]

Exhaust? Hope you didn’t pay that?Shouldnt need that so id be asking What’s happened there? Only reason you do that is if it’s been dropped or rotted/degraded away which shouldn’t be the issue here.

So its a cold running issue.

If their theory is that then it shouldn’t an exhaust change but a sensor maybe.

as bonio said its needs looking closer to the fueling/sensor or less likely the air/vacuum/oil system (pressure) which is why they suggest you leave it on idle (higher revs) for a few minutes to warm up.

id be looking a the stark plug node for a clue if it’s a fueling issue- has/is it running too rich and choking it up which will look like wet black thick coating or if its pre ignition (where the flash/flame yellow ignited but too soon) it will be thick dry coating that’s what can happen with E10 if the bike can’t adjust itself to cope but with this age of bike with sensors it should do.

another possibility is checking the battery in good shape as cvts and its system needs a good battery as that can cut it out. a volt meter that will tell you what its strength is and what its getting back from the system, With that checked it’s  easier to narrow down possibles. 
 

[bud]

Hard starting could be the valves need adjusting. I have heard of Chinese bikes coming from the factory with them not adjusted correctly.

It's not a hard job to do on the GY6 platform.