Does it work for all gy6 engines?

These fit and work perfect in GYD.139QMB engines 49cc.50cc.80cc.100cc engines and BBK engines..

I read a lot of ppl say they use it in a 50cc gy6 scooter, but the manual says it takes a A7TC OR A7RTC. Will this work?

yes the atc is a cheap Chinese plug the us replace is this plug both the ngk copper core or iridum plug s the best I use this in 3 of my scooters 50cc and 80cc bigbore kits you will be happy you spent the few dollars more this is what you want its a 10mm plug direct fit and replacement for the atc brand the gap is pre gaped and ready to go in the gy6 engines they come with a threaded top no cap buy the atc brand dosnt use a cap either I hope this helps jim

Manufacturer	NGK
Brand	NGK
Product Dimensions	0.9 x 1 x 3.3 cm; 30 g
Item model number	7544
Manufacturer Part Number	CR7HIX
OEM Part Number	758144, 9009822415, 9079320015, 9900069835C7R, J4520IUF22
Position	Unknown
Safety Rating	NÃO APLICÁVEL
Item Weight	30 g

(7544) CR7HIX Iridium IX Spark Plug, Pack of 1

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