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Old September 11th, 2018, 06:31 AM   #1
oakleaf
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Name: Mick
Location: Green Bay, WI
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2007 Wrong Plugs

Just swapped my son a 2001 Honda Civic for his 2007 Ninja 250R. (He needed a vehicle that works for work.) Other than a cracked front fairing (dropped on left side), looks beautiful, <5,000 miles.

The issue: NG CR8E plugs were installed accidentally and turned over. Replaced with correct ones but bike won't start. The sound of the bike being turned over is normal.

Initially, I'll do a compression test and probably get a scope to look into the cylinder. But before I do, I thought I'd ask here and see if any have experience and know what damage I can expect. (I saw the CR8E plugs. The ground electrode is flattened against the plug body pushing the center electrode in. The base of the body is angled very slightly, assuming from piston.)

Thanks!
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Old October 9th, 2018, 02:45 PM   #2
oakleaf
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I pulled the cylinder head. One piston has heavier carbon deposits then the other. Is this indicative that the carbs needs cleaning as well?
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Old October 9th, 2018, 03:41 PM   #3
DannoXYZ
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MOTM - Nov '17
Could be. Might also be blown headgasket. Which tends to steam-clean that cylinder with coolant.

Did you do compression/leakdown test before removing head? Definitely do one after putting it all back together and before trying to start it again.

Please review all the linked threads here on carb-cleaning and what it takes.
https://www.ninjette.org/forums/show...1&postcount=22
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Old October 10th, 2018, 02:29 AM   #4
Mohawk
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Modern fuel typically does NOT leave deposits, carbon build up is generally from oil reaching the combustion chamber. This can usually happen 3 ways, through the intake, if crankcase is vented to airbox, check airbox for oil. Through worn valve guide seals, or through worn piston rings or piston/cylinder damage.

If the wrong spark plug was used, is it longer or shorter than the right one ? These bikes run tight cylinder head clearances, so if to long, there would be impact damage to piston & the side spark electrode on the plugs would be damaged. If neither then the plugs are not your problem.
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Old October 10th, 2018, 03:03 AM   #5
DannoXYZ
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MOTM - Nov '17
Rich mixtures would definitely leave black sooty carbon deposits.
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