Maintenance & Technical > KX500 Original

What compression on your 500?

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I_Duddits:
I know my engine needs a rebuild but I'm running it while I rebuild my spare.
So on the bench (it's difficult to get a good kick on the starter) I get about 115psi. Is this going to be enough to start the beast? I reckon all assembled, when I can get a good purchase on the kick starter and kick it like I stole it, I should get a 135'ish out of it.

So is 115 to 135 gonna be enough?
How much is yours? I'm trying to get a feel for the average.

CR480R:
Are you holdin the throttle open?

I_Duddits:

--- Quote from: CR480R on January 06, 2008, 08:57:22 PM ---Are you holdin the throttle open?

--- End quote ---
No throttle on the bike as yet, why would it make a difference to the reading?

bigbellybob:

--- Quote from: I_Duddits on January 07, 2008, 03:14:27 AM ---
--- Quote from: CR480R on January 06, 2008, 08:57:22 PM ---Are you holdin the throttle open?

--- End quote ---
No throttle on the bike as yet, why would it make a difference to the reading?


--- End quote ---

yes it will make a difference and 135psi is low even for a 125.

I_Duddits:

--- Quote from: bigbellybob on January 07, 2008, 04:17:29 AM ---
--- Quote from: I_Duddits on January 07, 2008, 03:14:27 AM ---
--- Quote from: CR480R on January 06, 2008, 08:57:22 PM ---Are you holdin the throttle open?

--- End quote ---
No throttle on the bike as yet, why would it make a difference to the reading?


--- End quote ---

yes it will make a difference and 135psi is low even for a 125.

--- End quote ---

So how much should I be looking for then?

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