It's been my personal experience over the years, that compression readings have the most meaning when you can check the history on a particular motor. Of course, almost nobody is going to do a compression check at 600 or 4,000 miles on their new FJR.<snip>
What concerns me the least about OCFJR's compression readings are the numbers themselves. Too many unknown variables at this point.
What were the numbers when the bike was new? Hot or cold test? And so many of the other points previously raised above.
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Personally, I DO appreciate OCFJR's post. I appreciate the possible heads-up.
But like several others who posted responses, I would be inclined to de-carbonize that baby and ride it for a while, before declaring it worn out. Regardless of what the compression numbers may be saying.
Thanks for the excellent reading comprehension.
I'm not so much saying my engine is worn out, I'm telling you guys what Yamaha & the dealer is telling me. As Ashe states above, w/o the history on the motor, with tests at different points over the mileage, the numbers I have now are not enough to convince Yamaha that perhaps there is some other issue at hand. And frankly are not definitive diagnosis for anything either.
This post is about two things, letting people know what happened so far to me, and letting you folks know that perhaps you need to do some compression tests when you're doing other service during the life of your bike so that you have more data than I do at this point. I'd have loved to know what was going on at 26k, 52k, 68k (when the first cam chain tensioner was replaced), and now. That might give me a lot better picture of what was going on, and just might have made it more likely that Yamaha would tell the shop to tear into it, rather than just telling them it's "worn out". And also to see what this crowd would come up with for suggestions. There is a lot of knowledge here.
For all you that say these motors last longer, or should last longer, etc. Don't you think
Yamaha would be the one saying that? Shouldn't they be the first one's to say, whoa, somethings not right here? And do note just how far the scheduled service page goes in your owner's manual.
And hey, I do appreciate the tips. I'm familiar with most of the products mentioned and their use. And while I am a steady rider, anyone that's ridden with me will tell you I don't baby the bike. I'm not a total hooligan either.