Question about 2003 KTM MXC 300

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Compression test I ran a compression test on my bike and its about 40. I just need to know what it is supposed to be?

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  • Anonymous Mar 16, 2014

    Compression is 70psi shoul it be higher?

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  • Master
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Minimum 125 psi (time for a top end then) ... proper pressure after 5 kicks should be in the 175-190 psi range on fresh top end for that bike.make sure to either push the kill button or ground the plug to the engine while kicking it over or you could damage your CDI unit.,

Posted on Nov 10, 2008

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why take the engine out ? compression test and pressure drop test to see if valves are leaking is what i would have done first !! carb and fuel system clean ??

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My tomos revival ran fine then started losing power and droped in speed whay do I look for, plug is fine carb clean, air cleaner clean bike has 1200 senior miles


Hello
Well i always do the easier method to find out the problem.
hers a few things to do to determine whats wrong.
1st pull spark plug and do compression test, a blown head gasket will lose compression.
if the gasket is blown then the compression test will read a low psi and drop suddenly
2nd worn piston rings will lose compression, the compression test will read a very low psi below 100 psi and may leak right down depending on how worn the rings are.

that would make you lose power.
have it tested to see which it is.

either way, a lose of power in the motor is caused by lose of compression in the motor.
you can do the test your self, you can buy a compression tester pretty cheap, just make sure you don't cross thread the connectors.
have a good weekend
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1 Answer

My wife let my 99 fxr2 run for half hour...it was 40 degrees and windy.. it ran ok..im concerned about letting it run so long...im not home to check it out...should i worry ?


Why worry? What is done is done. I'd ride the bike and just see how it does. If the weather was like you said it was and she let it run for a half hour, it's probably alright. It is an air cooled engine and 40° weather is pretty cool. Just go home and ride it like you stole it and if it runs alright, just keep on riding and grinning.

If not, come back here and tell me what it's doing that you don't like. We'll see what we can do. The test is to run a compression test on it. It the compression is good, the engine is good.

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Does it feel like yhe kick is even engaging and turning the crankshaft? Are you full stroking/kicking it over or short stroking it? when cold, are you using the choke. I suggest taking a compression test when it feels as if it hs no compression It could be undersized piston, rings, or a simple. good luck

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