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In the meantime, I have found the main jet sizing.

In Japan, Taiwan and other countries where there is no restriction, the main jet size is #105.
Some countries use #102
Some other countries restrict the main jet to #98 (happened to my scooter).

I hope it helps for someone with the same iproblems I used to have.

Hi,


Just want to follow up on what happened to my scooter. I ordered a new Dr Pulley variator set, but it did not cure the problem. I also checked the wiring and the electric components, but no change there either.

I took the scooter to a local mechanic, who specializes is scooters, as the Kymco dealer was clueless. It took him half a day to figure out what's wrong with my bike. He checked the drive train, adjusted the valve clearence and engine timing. Then he took a look at the spark plug... It was all white. He disassembled the carburetor and immediately noticed that the stock main jet was replaced. The part installed was probably from a small scooter with a part nr "KY B6". He replaced it with a standard piece.

Why the previous owner did something like that is beyond me. I bought the scoot from a dealer, so I can't talk to the guy.

My scooter works fine now. With the Dr Pulley set up it really flies and no longer feels like an underpowered 150cc bike. I'm all happy now

I hope it may help some people who have problem with their scooter. I was told that the GY6 engine is bullet proof, but very sensitive to fuelling.

Thanks for all the help and info. I have a much better understanding of scooters now.

OK guys, I'm on track.

Issues found so far:

- Both small tubes were off the air filter house
- Partially damaged oil pressure sensor wire
- Torn wire around the cylinder (I have no clue what that is, posted image)




https://picasaweb.google.com/lh/photo/uj1OnNr_hEmlM-6WrgwCGzZxDMuPw5AA-Pyip-yylHo?feat=embedwebsite"><img src="https://lh6.googleusercontent.com/_1A4LoayIp3g/Tah7XevgSAI/AAAAAAAAABs/jN4tTSefdFU/s800/Issue.jpg

Do you know what that wire is?

I guess someone tried to "fix something" on the bike and did not care about properly fixing the cables, so they were tense and eventually got loose, or torn.

New day, new issues  

Went to the garage today and tried to start the scooter. The phone charging icon comes on the screen. I push the starter switch, the relay clicks, but nothing happens. The starter motor is silent. I checked the battery, it is in tip-top shape (no wonder, installed a brand new one a few weeks ago). All the control lights come up, when I turn on the ignition, but nothing happens.


- The kill switch is off (tried swithing on and off a few times)
- The lcd panel is blind, only the control lights operate (why the phone icon is on, I have no idea)
- When I switch on and off the lights (ignition on), the speedo and rpm comes on and off, but still nothing.
- Changed all the fuses, still nothing

If the starter motor died, the lcd display would still operate, so I have no idea what the hell has gone wrong this time.

I'm starting to regret buying this bike.

Thanks for your help, I really appreciate it.

I checked the needles. One of them has a single letter "P", the other one has 'H" on one side and "180" on the other.

So I checked the belt. It is 24,1x995. This is the OEM standard, so the belt is OK. I also bought and installed new rollers 23x18 20g, which is also the OEM standard. The bike still won't go above 6500 rpm and top speed is still low. Also, the variator started clinking at idle, which I did not experience before. This happened when I installed the new rollers and I'm pretty sure I put everything back as it was supposed to.

I also found 3 plastic pins under the storage cover and I have no idea where they come from. I assume they are from the variator, but I thought the pin should be metal, not plastic...

Any ideas how I could proceed?

Thank you. I will check the belt.