compression specs

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frankenschwinn
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compression specs

Post by frankenschwinn »

What should compression test yield. mine is at 155.

Got the bike running though
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Indawoods
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Post by Indawoods »

155 is real good!. . . . . proceed!
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Post by rbates9 »

My book says 95-150 is good.
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Post by bmiller »

95-150 seems to be a massive range in "acceptable".

I'm assuming this is a scale with 'wear-n-tear' in mind.

would a 95 mean "you'll need a new top-end soon"

and

a 150 mean "it's pretty fresh?"
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Post by Indawoods »

That's the way I would interpet it...
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Post by bmiller »

>|<>QBB<
Indawoods wrote:That's the way I would interpet it...

Sounds like a good "sticky"....
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rbates9
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Post by rbates9 »

Personally, I would probably do a top end when it got down around 120 but to each there own. And the wide spec is probably just a range that it will still run at?
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Post by Julien D »

My 89 manual says 119 - 185psi. I had about 170 immediately after my last top end.
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Post by rbates9 »

>|<>QBB<
rbates9 wrote:My book says 95-150 is good.
That is from a 97 kdx 200 book.
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Post by Julien D »

Yeah, for some reason the H series had lower compression specs than the E's.
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Post by rbates9 »

What is the lowest anybody has had on a "running" bike? How low can you get and still have it run? :hmm:
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Post by fuzzy »

They will continue to run for a long time...to the point that the bike is unrideable because the engine will only run in the upper 50% of it's range, and be down on power at that (of course).
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Post by Mr. Wibbens »

I think mine was still around 155 around the time I did the topend. +6 years and thousands of miles
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Post by Julien D »

Not sure what mine was when i tore it down. But from a visual of the piston and cylinder, it couldn't have been much. Still ran good though, lol.
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