gy6 scooter issues

[scootermatt]

Hello, I'm new here and this is my first post.

I just purchased a dongfang sunny scooter from a friend, it is a 150cc engine. it has a few issues that I have found and wonder if anyone could give me a few tips on how to proceed.

Issue 1 there is no wires coming from the wiring harness to hook up to the kill switch.
issue 2 the bike tries to start its self once in a while???
issue 3 there seems to be a gap where the intake manifold attaches to the engine?
issue 4 once you get her running about 10 minutes of riding or going up hill the engine shuts off.

This is the Bike:




This is the gap:

[oldchopperguy]

Scootermatt,

It's been a long time since I worked on a GY6 150, but you definitely have found some new and different Chinese "bugs"...

The apparent gaps in your intake attachment don't look right, but may be only cosmetic, caused by a plastic shroud. The engine shouldn't run right at ALL with gaps like that. It's simple to carefully remove the intake by loosening the two nuts holding it on... If it's OK, you might want to replace the gasket in case it's been compressed to its limit just to insure a good seal.  Your picture looks like the gap may be part of the plastic around the motor which should be above the flange on the intake.

As for the kill-switch, if the safety interlock switches keep the engine from starting with the center-stand not down, or one or both brake-levers being squeezed, I wouldn't even worry about it. (I've never used the kill-switch EXCEPT unintentionally... LOL!).  My old Xingyue had a nasty habit of the seat engaging the kill-switch when it was open and tilted forward...

The engine dying after a few minutes, or going uphill sounds like a fuel-pump issue (if your model has a below-floor tank with a pump) OR a vacuum-petcock issue.

I had a similar issue with my old 150 and replaced the vacuum petcock with a simple manual petcock made for a Briggs & Stratton. Sometimes the automatic vacuum petcocks "peter-out" when near wide open throttle is used, or for other reasons (probably known only to the Chinese...). It's usually a good idea to replace them with a reliable manual petcock, AND if so, be sure to block off the vacuum line to the old petcock.

My 150 had the tank behind the seat, so it was gravity-feed with no fuel-pump to worry about.

Also, your fuel-line probably has a filter in it somewhere between the tank and the carb. If it's dirty, as they often are, it could be the cause of your problem. Not letting a full supply of gas flow from the tank can starve the engine, causing such problems.  Sometimes, simply replacing the filter cures the issue!

As for the starter engaging on it's own, I have no good answers... If your scooter has remote-start, as mine did, it MIGHT be the key-fob remote accidentally engaging by defect, or simply getting squeezed in your pocket.  I sometimes accidentally unlock my car, or drop the windows because the key-remote gets pinched in my pocket...

These are some pesky problems... PLEASE, other members more expert do chime in here.
__________________________________________________

I'm an old Harley guy and arthritis and tight budget got me into scooters 10 years ago. Knowing nothing about the Chinese rides, but understanding they can be problematical, it took me nearly two full seasons to get mine 100% reliable, but I DID get it there, and loved it.

Three years ago, I traded up to a used Kymco 250 simply because local roads have changed, upping the speed needed to be safe beyond what the 150 would do. 150's are still my favorite "genre" of scooters, being affordable, nimble and true "scooters" as old geezers like me think of scooters.

Your style is among the most classic cosmetically, looking VERY "Italian"... I love the look of these scoots! It does need whitewalls, some red on the wheels and maybe a little checkerboard trim somewhere... LOL!

Best wishes on getting it running right. And please, other members more savvy help out with advice!

Sorry to be so late in replying to your post. I just got back regularly on this forum.  I left another site I helped start, and was there WAY too long. SCOOTER REBELS has some great members.

Ride safe!  When you get it running right you'll be riding a LOT, and LOOKING GOOD on that sweet ride!

Leo in Texas

PS:  One MAJOR safety item to check is your tire's valve-stems.  Many Chinese scoots (like my old one) had poor-quality valve-stems, right-angle brass poking out of rubber bases pressed through the rims.  If yours has these, and the rubber is as ALL "iffy" showing dry-rot, replace them with good new ones.  If a stem blows out while riding, it causes a fast deflation which can be dangerous.  Valve stems CAN be replaced WITHOUT removing the wheel or tire, by squeezing the deflated tire with a large C-clamp, exposing the valve-stem inside the wheel.