Scooter How-To : GY6 Valve Adjustment (Also For Buggy + Kart)

How to adjust the valves on a GY6 engine, common in scooters and go-karts.

Category:

Autos & Vehicles

Tags:

• gy6
• scooter
• valve
• lash
• adjustment
• setting
• how-to
• tutorial
• 49cc
• 50cc
• 150cc
• 125cc
• valves
• adjust
• instruction
• howto
• kart
• buggy
• atv
• help
• tappet
• .003
• .004
• .002
• chinese
• scoot
• four-stroke
• 4t
• inspection
• feeler
• gauge

[JJMCQ88]

Question: I'm removing my air intake case and swapping it out with a high performance cone shaped filter. After removing the air intake case, what do you with the hose that remains attached to the case.Does it get reattached to something or completely removed and discarded

[90gtvert]

@JJMCQ88 Trace it to see where it goes. If it's the drain hose, leave it on the old airbox. If it's a crankcase vent (leads to the valve cover) you need to do something with it. A lot of ppl take a longer length of hose and run it from the valve cover up  the frame for a few feet so you shouldn't get any oil spray etc... You can use a catch can or breather or combo of those. More info is on my forum if you need it (link on vid).

[Hooverdarnit]

I need to replace some broken valve springs on my GY6 scooter. My questions are.... Do the valve stem keepers have a up or down position? Do the keepers need to be flush with the valve stem on the top? Also, is there a trick to taking the rocker arms off to get to the springs, or does the whole unit come off with the rocker arms? HELP please.

[90gtvert]

@Hooverdarnit The whole rocker assembly comes off when you remove the nuts on the cylinder studs, all as one piece. You'll have to either pull the head off or use air in the cylinder to get the job done. Easiest way is to take the head off. The keepers can't be flush with the end of the stem. There is a groove near the end where they'll sit. Once you pull it off and have a look, it's actually quite simple and needs no explanation IMO. Just pay attention while you remove everything.

[Hooverdarnit]

Do you know if a special tool is needed to change a broken valve spring on a GY6?

[90gtvert]

@Hooverdarnit You'll need a valve spring compressor. PitPosse makes a nice one. There are some cheap ones out there that aren't nearly as nice, but should work if it's not something you plan to use much.

[ikillbugs]

@xtelevisionset aisle .03

[rosie1406]

Hi great video, explained really well. What would the valve adjusments be for my GY6 engine 168cc?

She is an Apache quad bike

thx

[xtelevisionset]

Where the fuck do I get a feeler gauge that's 0.03 mm!!!?!?!?!

[mack123100]

Thanks a Million.

I have a 250cc scooter and did not have not a clue how to do a exhaust and intake valve adjustment , now I know.

Thanks again

[moss8448]

the thing I have noticed is that they all vary as much as several thousanths of an inch and with that in mind it pays to adjust then fire it up and let it run it took me several tries to get it to quiet down and it seems no two are alike and as far as setting one different than the other is another question