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The mixture (pilot) screw is located under the throat of the carb on the air filter side:

mpsracing.net/helix-manual/04-07.html

Here's a video on how to adjust the IN and EX levers.

Hi fairweasel. The YY250T also known as the Zscooter in Europe is based on the Honda Reflex which was last on the market in the US in 2007. All plastic body panels including the windshield are interchangeable between the YY250T and the Reflex. The YY250T follows the original design of the Reflex more closely than the 250B (Linhai). The Reflex also has the gas tank in front of the radiator but the motor is horizontal rather than vertical. The Hondas also use electric fuel pumps instead of vacuum. I have never heard of a cooling problem with the Reflex. Obviously the gas tank in front of the radiator is not "the" real problem with the YY250T. The Reflex probably uses better components (radiator, cooling fan) than the YY250T along with full baffling around the radiator which forces all cooling air through the radiator. So far in the type of driving I have done I have had no overheating problems. The YY250T also uses 13" wheels front and rear and has a slightly longer wheelbase than the 250B which also uses the Reflex body.

I'm not too familiar with the YY250T-2 but I think I covered most of the differences.

I did pick up a new cooling system (radiator, fan, and fan sensor) for under $50 just in case cooling becomes a problem. I would try piggybacking the new radiator with the old to double the system capacity if necessary. There is a fair amount of room behind the gas tank. I also went with an electric fuel pump at the PDI.

Feel free to ask any questions. ;D

Not knowing the full history of your battery, I would do the following. This is a recap of some of the previous suggestions.

1. Check the terminals to make sure they are clean and tight.

2. If it's not the sealed type, I would check the liquid levels in all the cells. Add water (distilled preferably) if necessary.

3. To ensure accuracy in this step, use a fully charged battery. Use a voltmeter to check the voltage at the battery with the engine running. Should be above 13.2 volts at idle rising to about 14.5 volts at 5000 rpm.

If the above checks out, then your battery is suspect especially if it's the OEM and it is a "wet" type where you can add liquid. Sealed or AGM batteries give much better service than the OEM wet types.

When the key is turned off, all lights are also turned off.

You have a basic multimeter much like the one HarborFreight has for about $3 to $4. Here is a link to the HF manual which may be a little bit easier to understand:

manuals.harborfreight.com/manuals/90000-90999/90899.pdf

Yep, sure is a lot of merit in what Dr. JR said. The Chinese R&D expenditure is most likely close to zero which is in part reflected in the low scoot prices. When, and if, R&D kicks in to try and improve the ergonomics and ease of maintenance and reliability, then the price will certainly go up. As long as we know what we are buying (after researching this forum) then we will get the max fun and use out of our scoots. ;D

Hi classic50. My VIP50 is identical to your scoot. I have a mirror mount windshield which is a must for cold weather riding. You already have hand shields on this scoot so that is a plus. A full face helmet gives maximum cold weather protection. I use a modular helmet. I have also used ski gloves for additional hand protection. I like to use 5W-30 oil during the winter to help cold starting. Having a good quality AGM (sealed) battery of the highest capacity (amp-hours) is also a good idea for cold weather running. Here is a shot of my Slipstreamer windshield: