2003 Suzuki 400 LT-Z Starting

[WetVertical]

I recently did an oil change and spark plug replacement on my quad, and it wouldn't start immediately after changing the oil. I did a compression test and had 30 PSI. what could that indicate? I also do not have a leak down tester.

[Mech]

I presume it was running fine before this work ?

So you'd changed the plug and oil both together and at the same time ? And you tried starting it and it wouldn't start at all, didn't fire even ?

So did you check the sparkplug, which would of course be the obvious problem ?

And if it did never start after the service, how long did you crank it before testing the compression ?

If the oil was bad it wouldn't cause enough wear, that fast, to lower the compression. I'd suggest the rings are stuck in their grooves.

I'd also suggest you use a screwdriver or something and dip a bit of the oil out of there and see if it will wash off/dissolve in water.

 

[WetVertical]

When I parked it in the garage it was running great, slight ticking from the timing chain, which i checked the cams with a feeler gauge at top dead center intake was within spec 0.10 slight drag on exit, and the exh was 0.20 in spec according to what I read for the specs. I did a spark plug change and oil, checked for Spark has a strong spark. 

But the compression test yielded roughly 30 PSI factory spec is 142 PSI.

Edited August 23, 2022 by WetVertical

[Mech]

But you didn't adjust the valves ?

And it hasn't gone since ?

Test the oil as I say.. see if it's water soluble..

Edited August 23, 2022 by Mech