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1992 Honda 300 spark plug reading

927 Views 9 Replies 6 Participants Last post by  SlammedRanger
Sorry if my grammar is bad, but I have a 1992 Honda 300 that I installed a thrush glass pack on yes bring the hate it was cheap.

Anyways I figured I would have to jet my carb but thought I'd check the plug first I ain't no mechanic checking the plug isn't my thing. Thought I'd ask for you opinions first, I have ran the engine for about 15 to 20 hours after putting the pipe on many heat cycles.

Quad runs good but backfires quite a bit around mid range rpms while engine braking. Although after riding for about 45 minutes and the engine is hot the back firing seems to stop so I don't know. Doesn't ever bog I mostly ride at WOT for best engine braking since it has very not existing brakes lol

I live on a farm so I do use this quad for chores and moving cattle as well so it does do alot of idling and low throttle riding. But anyways enough rambling if you could please look at my pictures and tell me your input that would be really helpful. Thanks

P.s it sounds damn good and I'd say has alittle more top end power still pops a wheelie as well

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Well whenever I get time I'll go pick up some plugs and do that test. I just want to be sure I'm not damaging anything from running it to lean. I do have a extra engine but rather Wouldn't want to melt down a perfectly good engine.

Plus its the Original to the bike and it has history in the family my grandpa bought it new in 1992 still runs mint. actually probably the best running bike we have on the farm out of our 4. 2001 Honda 350, 2004 Honda foreman 450, 1998 Honda foreman 400 and my 2015 arctic cat 400 yes it runs better then a 2015 lol

Hopefully nothing destroys it self before I get to doing the chop test.

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