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1992 Honda 300 spark plug reading

908 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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pics are deceiving , I think I would fatten it up 1/4 to 1/2 a turn and see what it looks like then

Slammed , I know you are a sports quad guy and not a utility quad guy , but know you are very knowledgeable with engines , so maybe you can answer this one for me , I also have a 92 300 , which is the 1st gen which I didn't think has a rev limiter , or maybe it does and is just set at a higher RPM than the second gen 300's , I know with a tack on the 92 it will turn up over 7K and doesn't sound like it is kicking out , the 2nd gens I have would only turn up 6K , when I put a no limit CDI on my 96 it will exceed 7K and never sound like it is kicking out
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