So that is the plug that came out of the bike. Naturally, since it came out of the bike, I assumed it was for the bike. Whoops! I got another plug on order (IFR8H11), so hopefully it will be in within a few days. I'm shocked it took this long to fail (assuming this is a spark plug issue), cause its seen over 700+ miles of travel so far.Where did you get that plug ??? (who told you it was for your bike ??) , the plug for your bike is supposed to be *only* NGK IFR8H11 or a ND (Nippon Denso) VK24PRZ11 , I referenced that NGK TR51X. plug on NGKs site , for a 450X , and it does not show it at all , not as a alternative , not at all for a CRF450X , the only reference i can find is in automotive and marine applications , these bikes have hi performance engines and require special plugs , from what i gathered the plug you have sells for about $7.00 , the plug made specifically and recommended for our bikes (450R and X take the same plug) is about $16.95 *retail*
I am thinking that plug is part , actually a lot of your issues , looking at the picture it looks like it has been detonating , and is about ready to start welding itself to oblivion (it actually looks like a Stick Welders stick with tons of slag on it) change that plug to the correct one , and try starting again .... , I can run the NGK IFR8H11 for a year or more and not have it look like that , in fact the plug in my 450X has been in there for over 3 years , , I pull it out to inspect it from time to time and it does not look even close to that kind of slag/soot/detonation and my X can sit for a year and fire right up with about 6 pumps to the throttle and full choke and hit the button ... I think that plug is complicating any issue you are having and is possibly the main cause
Correct Ray , that plug is not meant for this bike as i mentioned , (i did not even notice the washer was missing... oops) and that is what bothers me , the parts of it I pointed out bother me enough and lead me to believe the plug is a big factor in his issue , and also the hole is made for the washered plug , hopefully it did not damage the sealing surface , though it "should" be ok but , i cant see how the plug completely sealed , which could be part of the detonation look of the plug , if it did not seal as that would cause a lean condition along with a compression issue , along with what looks to me like water has been in the combustion chamber due to the orange coating i see on the electrodeJim,
I assume from the pictures that the standard plug uses a flat face and sealing washer.
It appears the other plug is conical seating type. Not sure what that would mean to length of plug into the cylinder.
Can we get a photo of the plug hole to check what the bike is machined to have.
Also get a bright torch and look at top of piston through plug hole.
If the plug is too higher a heat range it can pit the top of the piston.
Even if wrong plug it can still fire with a bright blue spark outside of the engine.
It is only and indication it is 'working', what goes on inside an engine is an entirely different scenario. It is one thing to eliminate as an issue, first.
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