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oakleaf · October 22nd, 2018, 06:49 AM

Thanks, makes sense about the aluminum cylinder head wear where valves seat! I guess I thought wear would occur between valve stem and rocker tip, or cam and rocker.

Next question...

I exchanged the pistons, buttoned up the engine, reinstalled it, put in new CORRECT plugs (LOL), and ran the bike.
The good news: The bike runs EXACTLY like it did before I stupidly installed the wrong plugs.
The bad news: The bike runs EXACTLY like it did before I stupidly installed the wrong plugs.

I was hoping the initial problem would have somehow gone away. But it continues to bog down. Starting in first gear, when I crack the throttle a bit to get going it seems initially ready to take off for a fraction of a second, but it then seems to bog down and go blahhhh. I run it through the gears, max speed is 50-55. Now I'm a big guy (235#) and I know this is a 250, but I'm assuming the bike can do better than that?

Spark appears very good. Assuming fuel issues. Any ideas, or how would you suggest I troubleshoot?

Thanks in advance!

October 22nd, 2018, 06:49 AM	#12
oakleaf ninjette.org member Name: Mick Location: Green Bay, WI Join Date: Sep 2018 Motorcycle(s): 2007 Ninja 250R Posts: 24	Thanks, makes sense about the aluminum cylinder head wear where valves seat! I guess I thought wear would occur between valve stem and rocker tip, or cam and rocker. Next question... I exchanged the pistons, buttoned up the engine, reinstalled it, put in new CORRECT plugs (LOL), and ran the bike. The good news: The bike runs EXACTLY like it did before I stupidly installed the wrong plugs. The bad news: The bike runs EXACTLY like it did before I stupidly installed the wrong plugs. I was hoping the initial problem would have somehow gone away. But it continues to bog down. Starting in first gear, when I crack the throttle a bit to get going it seems initially ready to take off for a fraction of a second, but it then seems to bog down and go blahhhh. I run it through the gears, max speed is 50-55. Now I'm a big guy (235#) and I know this is a 250, but I'm assuming the bike can do better than that? Spark appears very good. Assuming fuel issues. Any ideas, or how would you suggest I troubleshoot? Thanks in advance!