Replacing a Snowblower/Lawnmower spark plug

Efour · 20 May 2023 at 12:07

Husqvarna st124

I know nothing bout engines :cry:

The manual says my blower/mower has a...

Electrical system Spark plug F7RTC Spark plug electrode gap (in. / mm) 0.027–0.031 / 0.7–0.8

do i just buy a sparkplug that is F7RTC ?

Is that gonna be the exact size and length and a like for like size.

Lol embarrassingly bad at this. Need to learn.

If what i said is right can you link me to one for sale online in a UK shop so i can read and understand wtf its all about

Semple · 20 May 2023 at 12:25

I'm not sure you'll find many shops in the UK selling snowblower stuff

Monkeynut · 20 May 2023 at 12:29

F7RTC are made by Torch and are crap. Get an NGK BPR5ES. Halfords will probably have one. This will be fine.

Efour · 20 May 2023 at 13:40

Semple said:
I'm not sure you'll find many shops in the UK selling snowblower stuff

Efour · 20 May 2023 at 14:31

Monkeynut said:
F7RTC are made by Torch and are crap. Get an NGK BPR5ES. Halfords will probably have one. This will be fine.

ok cool thanks. I can get it on amazon.

NGK BPR5ES comes in a NGK BPR7ES and NGK BPR9ES too. Just so i learn something what's the difference?

Efour · 20 May 2023 at 14:34

Monkeynut · 20 May 2023 at 14:34

Efour said:
ok cool thanks. I can get it on amazon.

NGK BPR5ES comes in a NGK BPR7ES and NGK BPR9ES too. Just so i learn something what's the difference?

Plug temperature, I think from memory NGK have their system backwards to everyone else and the lower the number, the hotter it is. In work we have HONDA mowers and clone generators and regardless if it's a BPR4ES or BPR7ES, a BPR5ES always works fine. It'd matter if you were on top of a mountain or in the middle of the sahara I suppose.

Efour · 20 May 2023 at 14:36

Monkeynut said:
Plug temperature, I think from memory NGK have their system backwards to everyone else and the lower the number, the hotter it is. In work we have HONDA mowers and clone generators and regardless if it's a BPR4ES or BPR7ES, a BPR5ES always works fine. It'd matter if you were on top of a mountain or in the middle of the sahara I suppose.

what about -20 in a swedish winter. Oh well literally just bought it anyway. Thanks for the advice much appreciated.

Chris Wilson · 20 May 2023 at 16:42

The "R" in NGK's (superb plugs...) designation just means it has an internal resistor for suppression of radio interference, for most basic applications you can ignore / drop the "R".

If you want to understand NGK heat range designations this may help:

Heat Range - NGK Spark Plugs Australia | Iridium Spark Plugs | Glow Plugs | Oxygen Sensors | Ignition Leads | Ignition Coils

The world leader in spark plug technology for over 80 years. Don't just ask for a spark plug, insist on NGK.

www.ngk.com.au