SFM 125 Roadster-8A Spark Plug K157FMI CR8EIX with 10mm Halfords Spanner

Posting to save someone else hours of research on this.

The bike is a SFM 125 Roadster-8A 2013
Engine = K157FMI with flat piston


-Changed the spark plug for a NGK CR8EIX (Iridium) the manual states D8RTC (but this one fits) - what was on there was a CR7E which is a hotter plug - I went by the LEXMOTO spec for SFM Roadster 8A

- You can put a CR8E on here, I went for the Iridium (IX) as a try out
- Halfords 10mm Spark plug Spanner did the job - finding what size socket was near impossible other than going in the shop and testing it!

Found this on the NGK Website when researching whether what going up to CR8E from CR7E really meant:-

http://www.ngk.com.au/spark-plugs/te...ge-explanation

Heat Range Explanation

Typically the heat range for NGK Spark Plugs varies from 2-11. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. The term hot/cold is commonly used to describe whether a spark plug heats up easily (hot) or whether it provides resistance to heating up (cold).

Generally, low power engines such as lawn mowers don’t produce a large amount of heat, hence use a low heat range (or hot) spark plug such as a 4 heat range. This means the spark plug will heat up easily and reach its optimal operating temperature. High performance engines on the other hand produce a large amount of heat, hence a high heat range (or cold) spark plug such as a 10 heat range needs to be used to resist the heat developed by the engine.

Quote:

---

Originally Posted by dscheoff

... the manual states D8RTC (but this one fits) ...

---

That manual tells :bs: | Attachment 18105
Chinese spark plug:
http://www.chinasparkplug.com/upload...1350176710.jpg