I like NGK’s. No longer have my E28 but in my 944 i still run NGK’s.
I suggest buying a known high quality replacement, not being picky about the exact spec, and seeing if that makes a difference. At under $5 it's a minimal cost and effort. Based on the what this engine was likely copied from, I would pick a NGK BPR4ES or BPR5ES from a vendor that doesn't have a reputation for NGK counterfeits.
I removed the Champion plug and replaced it with an NGK and on the first pull it ran.
I use NGK Iridium's in my generators. People say I'm nuts for spending the 10.00 for one, but I never have problems starting on gas or propane which is what I use with Iridium's, and plus you'll probably never have to replace it either.
I just replaced the stock plug in my Champion inverter with a NGK and it runs significantly better. No more random misfires.
I threw the nasty plug away, installed the NGK plug and it now starts on the first pull and runs smoothly.
I have always had luck with the NGK iridium plugs.
Lol 560 for 4 piece spark plug? That plug better be made of gold even laser iridium also doesn't cost that high. Good ngk iridium cost no more or less than 300. That syn 3k for 300 can get a far better brand n enhanced thermal and oxidative stability grade.
Just get stock NGKs, I’ve never had brisk plugs last for anything, and the fuel stratified cars don’t really suffer from spark blowout in the same way.
NGK are shit for LPG. Use Denso, suitable for your car.
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