[Calvincase]

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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[shadetree]

looks normal to me !. you want a '' tanish '' sparkplug tip .

 

[SlammedRanger]

Hard to tell from the pictures. But looks lean to me. I would like to see alittle more of a cardboard brown color on the porcelin. That being said the only way to be sure its lean is to do a plug chop. That requires a couple spare plugs and a wide open place to get to 4th gear just before the rev limiter. Shutting it down and pulling the plug to cut the threads off and look for a ring of color about 1/4 off the base of the porcelin.

 

[Calvincase]

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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[_Wilson_]

What brand plug ? And heat range ? The color looks a tad..... Off (light)

 

[SlammedRanger]

You may need to talk to some of the utility quad guys on here on how to properly do the test. I do it on sport quads with a clutch. And when i hit 4th gear and wind it out to just before rev limit i pull the clutch while flipping the kill switch and roll to a stop. Thats the proper way to do the test. I havent the slightest clue how to do that on a quad with no clutch lol. But you will want to warm the quad up on your current plug. Then slap in a new one and go real hard on the throttle through the whole test.

 

[fishfiles]

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

 

[SamUK]

Richen the mixture (screw out) 1/4 turn at a time, definitely lean IMO. @SlammedRanger helped me with my carb issues and he was absolutely spot on!

 

[SamUK]

You may need to talk to some of the utility quad guys on here on how to properly do the test. I do it on sport quads with a clutch. And when i hit 4th gear and wind it out to just before rev limit i pull the clutch while flipping the kill switch and roll to a stop. Thats the proper way to do the test. I havent the slightest clue how to do that on a quad with no clutch lol. But you will want to warm the quad up on your current plug. Then slap in a new one and go real hard on the throttle through the whole test.

Similar procedure except hold the gear lever up until you’ve come to a stop, holding the lever up (or down) will keep clutches engaged

 

[SlammedRanger]

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

Does the 1st gen 300 have a cdi? The cdi is what sets your rev limit. Honestly on a utility quad i wouldnt put it passed them to not put a limiter on it. Since they werent really designed or meant to be reved out that far anyway.