spark plug size hueseng engine?

I have this saved (can't remember where I got it though

NGK CR5HSB
Autolite 4194

Plug gap 0.6-0.7mm

Standard NGK CR5 HSB

scotto- said:

Standard NGK CR5 HSB

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I thought I said that

Hi all this is my first post. first let me say this first . i am a trained auto mechanic with 25 + years of experience and 20+ years of drag racing so i can read a spark plug.


the stock plug that comes with my engines is Torch A5rtc. after putting 2 to 3 hundred miles on my motor i pulled the spark plug and took a look. to my horror i seen that this plug is to hot for this engine.

the ground electrode on the plug was getting to hot all the way back to base of the plug.
and on the porcelain i seen aluminum specs. if i was to keep running this plug piston will get a hole in it over time.

so i went on the hunt for a proper plug for these engines.

i tested the NGK cr5hsb that is recommended on this forum it is a cross to the a5rtc it also is to hot and i seen specs of aluminum on the porcelain after only 10 miles,
so i need a colder plug.

NGK cr6hsb is the next coldest plug but no one had one here, it would need to be ordered.
so we crossed that plug to a champion z9y it is a copper plug. this is the same plug Honda uses on it 50cc 70cc 100cc 125cc ect 4 stroke motorcycles.

I ran the champion z9y for 125 miles and the finding are. the heat-range is just right no specs of aluminum on the porcelain the electrode is showing it is in the right heat range and i picked up 2 miles per hour on top end my gas mileage has jumped 8 miles per gallon


the champion z9y is the spark plug i am going to run.


NGK cr6hsb will probable preform the same, i may get one and test it

Happy motor bicycling !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I've been running the Iridium NGK CR7HIX for the last 1,000miles in my HS and it performs flawlessly. That's what I'll be using from now on....check your local lawnmower shop. Cheers.

scotto- said:

I've been running the Iridium NGK CR7HIX for the last 1,000miles in my HS and it performs flawlessly. That's what I'll be using from now on....check your local lawnmower shop. Cheers.

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Did you notice any difference in power with the iridium plug. I know when I put one in my 2 stroke I could tell a difference.
SB

silverbear said:

Did you notice any difference in power with the iridium plug. I know when I put one in my 2 stroke I could tell a difference.
SB

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Just slightly, it seems to pull stronger than ever and starts with one or two pulls no matter what. It's def my plug of choice for this engine....I run them in my 2-strokes too.

Thanks for the info as I broke the electrode off my plug....

These iridium NGK plugs are on sale this week at DDM.... limit 2 per person.

scotto- said:

These iridium NGK plugs are on sale this week at DDM.... limit 2 per person.

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What's DDM? I goggled it & couldn't find the plugs

BiMoPed said:

Search Results

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The plug was $6.50. The shipping was $7.00!!! I didn't get it.

Lol....can't says I blame ya....to pay more for shipping than the actual item being purchased would be ridiculous. I ordered a couple at that price and a bunch of other goodies so $7 for shipping isn't too bad.

And then if you have orders over $100, your shipping is free.

Sorry JB....

jbcruisin said:

The plug was $6.50. The shipping was $7.00!!! I didn't get it.

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oil dipper huaseng 4 stroke

does anyone have one? or a blown motor i can buy???

Why would you guys ship a plug. You can go to any parts store and have them order it, no shipping cost at all. I have the guys here at Oreilly's stocking at least three different plugs for me at all times, all I had to do was ask!

I'm going plug shopping this morning. I have to say that so far I am amazed at the heat range we're talking about. I've been a motorcycle mechanic since the days you could buy a new Honda 160. That's a long time ago. Seems to me the Honda and Yamaha 4 stroke street bikes ran NGK B8hs or es. If it needed to be warmer than that, you could go to a 7. Note: Champion plugs numbers go the other way - bigger number + hotter plug.

I have only seen a couple NGK's in the 5 range, some 6's and lots of 7's and 8's. I want good performance out of my engine too, but I'd rather run a cool plug, foul it and replace it, than cook a piston. So I'm gonna be looking for an NGK C8HSA. 7 would probably be OK too, but no 6's for my engine.