ngk iridium's

adrian101 said:

I've been told by a lot of people that the iridium plugs burn/spark to hot for the stranded china two stroke engine, "will destroy the piston". Is this true or BS?

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I run NGK Iridium's in everything too.
They are a touch longer so you get a slight compression gain.

The less expensive BP7HS plug is longer as well and works about as well, I just find the pre-gapped Iridium to never be the problem if it won't start and worth the extra $5.

If you have a high compression head the plug tip will hit the piston.
Generally it just flattens the anode but it could damage the head, but no, it's not a Plutonium plug that could go into meltdown and destroy your engine along with a city block ;-}

The 2-stroke NGK 5944 (BPR?HIX) plug runs your engine as hot as the number choice you put in for ?.
The higher the number, typically 7 or 8, the cooler the engine runs.

The trick is you need the engine to run just hot enough to burn everything so the plug doesn't foul.
General rule is 7 if it's hot where you live, 6 if it's not too bad.

Note the 4-stroke one for the HS 49cc is NGK 7544 (CR?HIX).

toojung2die said:

I'm still using the original plug.
I haven't even looked at it for over a year.

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I get repairs for 'loss of performance' in like that.

20 minute job on a good engine...
We pop the head and check things, clean it up, torque it back on proper and put in an NGK plug for $50 and the story is the same...
'WOW! This runs better than it ever has!'.

I've said it for years.
The single best 'bang for the buck' performance enhancement for the little engines we use is the NGK plug.
I suspect if you try one 2Young you'll say the same ;-}