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Author Topic: 1991 kx250 smoking & bogging ?  (Read 7926 times)

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Offline timberwolves

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Re: 1991 kx250 smoking & bogging ?
« Reply #15 on: October 01, 2013, 05:52:25 AM »
I put the #48 in and seems to running much better, no bogging. I also performed a leak down test on it today, here are the results. Pressurized to 7 psi. at bdc after 2.5 mins. it dropped to 6.5psi., 6.0 psi. @ 5 mins, 5.5 psi. @ 8.5 mins, &  5.25 psi. @ 10 mins. Is a 1.75 psi. drop at 10 mins a significant loss ? I sprayed everywhere with soapy water during the test, exhaust plug, carb boot, sparkplug, etc. and didn't see any bubbles. Am I correct the test has to be done with the piston ant bdc ? John.
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Offline sandblaster

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Re: 1991 kx250 smoking & bogging ?
« Reply #16 on: October 01, 2013, 06:27:01 AM »
It should hold pressure over night so yeah, there is a leak somewhere...
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline timberwolves

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Re: 1991 kx250 smoking & bogging ?
« Reply #17 on: October 01, 2013, 07:39:28 AM »
I was not sure how long it had to hold pressure for, I thought it was a percentage for a 10 minute duration ?
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Offline sandblaster

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Re: 1991 kx250 smoking & bogging ?
« Reply #18 on: October 01, 2013, 08:00:26 AM »
Everything I have read says overnight... And... It's Motorrad approved  :-)
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.
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