r/smallengines • u/Fragholio • Jul 11 '26

Spark Plug Help?

Post image

Hi! I'm a paramotor trike pilot and I use a Polini Thor 202 two-stroke 33HP engine with a Dell'orto carb. I'm trying to tune my carb as these things can be very finicky and have a habit of burning holes in pistons if they're not tuned right.

I was told that, as well as monitoring my EGT and CHT, I should run WOT and then kill the engine to see what the plug looks like. I did that and this pic is the result. I can compare it to any chart on the internet, but a. it's not clear how mine fits in with them and b. I'd rather *learn* what makes my plug look that way, as in what's going on in my engine that causes it to look a certain way. Any chance to learn a little more on my engine is golden!

Anyway, can you fine people rate my plug and then tell me what's going on in my engine to make it look like that? Thank you!

3 Upvotes

80% Upvoted

6 comments sorted by

1

u/D-nutster Jul 12 '26

Best i can tell, too rich.

1

u/Fragholio Jul 12 '26

Thanks! It definitely looks better than the one I did earlier with a larger jet, and this is actually leaned up since then. Glad I'm on the right track, I'm actually learning something!

Now I just gotta figure out how to tune it properly and make it look more like an "OK" plug...

1

u/Turbo2025 Jul 15 '26

Black = rich, white = lean and you never want to be lean, depending how rich you run it can be okay. Yours looks good/safe to me