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

Will this fit a yamaha YB 125 cc

If NGK (4549) CR7HSA is your standard plug, then yes.

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⚡ Ignite your drive with NGK’s precision spark!

FOULING NOT HERE - Longer insulator nose and corrugated ribs prevent flashover and fouling, keeping your engine running clean.
DURABILITY THAT LASTS - Fine Iridium tip and triple gasket seal combine to resist fouling and combustion gas leaks, extending spark plug life.
RACE READY RELIABILITY - Engineered for performance enthusiasts who demand consistent, high-octane ignition every time.
THROTTLE RESPONSE BOOST - Optimized electrode design ensures quicker ignition, giving you that instant throttle kick.
PRECISION IGNITION POWER - Laser-welded 0.6mm Iridium tip delivers unmatched spark stability for peak engine performance.

The NGK CR-7 HIX CR7HIX Spark Plug features a 0.6mm laser-welded Iridium tip for superior ignitability and durability, a tapered ground electrode to minimize electrical quenching, and a triple gasket seal to eliminate combustion gas leakage. Designed for performance enthusiasts, it enhances throttle response and resists fouling with a longer insulator nose and corrugated ribs, ensuring reliable, high-performance ignition.

Reviews

N**I

Your bike will run a lot smoother

Improves performance from standard plug

9.06.2025

S**R

Perfect Spark ⚡️

These are the holy grail for small engines , pretty much a diagnostic tool as well . If it don’t start with one of these , look at fuel flow / electrics for the fault

2.01.2020

A**N

Great replacement plug

My Lexmoto Milano 125 started coughing when going over 40mph, replaced the spark plug with this and its back to being able to get up the speed limit with no problems

30.06.2018

G**S

Improved tick over

A bit over kill, maybe; how installed this in a 'cheapo' Chinese 50cc motorbike. It replaced NGK a C(R)7 HSA @ under £4 difference in price, worth try. Changed nothing else.. the motor idled slightly more RPM and turned this down and seemed a lot smoother.

9.12.2012

S**3

Best plugs for motorbikes

Bike was hard to start, now with this plug starts 1st kick every time and runns better

11.07.2019

B**S

Peugeot Speedfight 4 125

Just the job, fitted to a Peugeot Speedfight 4 125. I’m not sure why the description says 4 because you only get one

17.04.2022

I**S

Great!

Put in Direct Bikes QT50-11 and it has improved the engine idling and cold start by a huge degree! Great!

23.01.2016

D**E

Five Stars

Does what it said on the tin good spark plug

18.10.2016

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Manufacturer	NGK
Brand	NGK
Model	NGK_597544_87295175446
Product Dimensions	0.9 x 1 x 3.3 cm; 30 g
Item model number	7544
Manufacturer part number	CR7HIX
OEM Part Number	7544
Safety rating	NÃO APLICÁVEL
Item Weight	30 g

NGK CR-7 HIX CR7HIX Spark Plug

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