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Posted by David Sherman [72.47.9.228] on Tuesday, February 15, 2011 at 04:28:58 :
In Reply to: Any ridge to the cyls? posted by Chris Case [76.212.214.240] on Tuesday, February 15, 2011 at 01:27:33 :
No, not at all. Cylinders are pristine. No visible scuffing, no ridge, and I cant move the pistons side to side at all. The word I hear is the bottom ends of the honda motors never wear out, just the heads. This is my third, and the second one I've had open, and I'd agree. I've seen lawn mower motors with way more wear. You might be onto something about the tension in most rings. Maybe it's just tradition and it's really not necessary. I was kind of surprised the cylinders were so nice since I suspected the K&N air filter was letting in more dust than a paper filter, but I guess it's okay. There's no one trick the the hondas -- just got all the details right -- right metallurgy, right geometry, right controls. Over the past 30 years they'd just kept refining that little 4-banger. I believe it was also the only motor to meet smog without a smog pump back in the early days -- very clean burning. It's the second one I've burned a valve on, though. Most likely the chambers were so carboned up that some carbon got under the valve and kept it from closing all the way. I'll be curious to see if it stops burning oil now. I might just clean up the old plugs and put them back in. They're some kind of fancy $12 apiece NGK platinum plugs -- all covered with gunk, but not burned at all.
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