which spark plug for 4.5 HP engine

[Davisrf]

Hi, I've been using Champion 6851 but would like to know the correct / best plug for this engine OR what you find works well Thanks

 

[EngineMan]

Hi, I've been using Champion 6851 but would like to know the correct / best plug for this engine OR what you find works well Thanks

You need to tell us here what make and model of engine you have.

 

[ILENGINE]

And code number. some engines made during or after 2011 take a different plug than before then.

 

[Davisrf]

Sorry, Engine is B & S on a Murray. I also have same engine on a Weed Eater. I want to get best plug for either mower. These two mowers are definitely prior to 2011. More like 6-8 years old. THey are not where I can get the code # today but I can call my friend to get it from each mower if need be.

Also, another question. ONe of the mowers will start well and run for about 20 minutes and then die. I have to wait about 20 minutes to b e able to start again and then it does same thing again.

Thanks a lot, Steve

 

[AnthemBassMan]

The stock plug would be a Champion RJ19LM. But personally, I'd go to an auto parts store and buy an NGK plug. Either the B2LM or the B2LMY. I've always had better luck with NGK in small engines...

L8R,
Matt

 

[EngineMan]

"Also, another question. ONe of the mowers will start well and run for about 20 minutes and then die. I have to wait about 20 minutes to b e able to start again and then it does same thing again."

Next time it does it see if you have a spark...!

 

[AnthemBassMan]

Yeah, as soon as it dies like that, check to see if you still have spark. If you do, then it is probably crud in the tank blocking the fuel flow. If you don't have spark, then the coil is going bad...

 

[Davisrf]

Much Thanks to all of you.
Will do ref. checking the coil. It is not gas sludge as I clean the carb, replace the carb Diaphragm and clean out the gas tank. So consistent every time at about 20 minutes that it likely has to be heat related, compromising something like the coil or causing another part to change tolerance.

Ref: NGK plug. Either the B2LM or the B2LMY: I will get an NGK unless somebody else has input on this. What does the Y mean in the second part #, if a hotter plug then liekly I will stay away from that one.

Any further input on either subject appreciated. Steve

 

[EngineMan]

The Y= V-Grooved centre electrode with extra projection on a NGK plug

 

[AnthemBassMan]

Actually the Y designates the plug as one of the new Pro-V line. That line replaced the older Commercial Series plugs. Same heat range as the regular plug...