Chickenone
XS400 Enthusiast
ya so im doing this buil... got it all back together.... got gas.. and trying to fire it up... wont kick over it has spark on both sides .. i checked compression and its only at 30psi.... before the build it was 150!!!
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Compression...was 150.. now 30
- Thread starter Chickenone
- Start date
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- Tags
- compression
cturek
XS400 Addict
Are you holding the throttle open ALL the way during the test? The butterflies have to be open to suck air for the test. Is your battery fully charged?
Chickenone
XS400 Enthusiast
yep..... i adjusted the valves as best i could.... super hard with the damn xs400... i bent the feelers and everything... still hard.. so now left side is 120psi and right side is 90 psi....
Put a little oil in each cylinder...a little, and try it again. If it doesn't change much, you have a valve issue- either burnt, eroded seat or hopefully, just need to adjust the valves again. If the compression goes up appreciably...sorry, rings.
Chickenone
XS400 Enthusiast
someone needs to design some good fitting feeler gauges for the xs400 valves! haha
you can buy the angled feelers.
Gets easier after about the 5th time.
