Posted June 17, 200916 yr Hello Yamaha-Freaks, i would like to check the compression of both cylinders of my XS400 SE (4G5) Year 1982.Can you give me data about the min/max parameter range.How high has the pressure to be....THX from WOLF...) PS: I am looking too for a pair of Mufflers in very good condition for that Bike....
June 17, 200916 yr Moderator Hello Yamaha-Freaks, i would like to check the compression of both cylinders of my XS400 SE (4G5) Year 1982.Can you give me data about the min/max parameter range.How high has the pressure to be....THX from WOLF...) PS: I am looking too for a pair of Mufflers in very good condition for that Bike.... YG2008, is that a DOHC bike?
July 9, 200916 yr Author It should have at least 100 lbs. Better still upward around 150-170 lbs. Thanks for the data...the last measure was 130 left and 160 right...i hope the difference is not too much.... Have a great day WOLF
July 9, 200916 yr Have you tried a comp test after putting a very small quantity of oil down the bore via the plug holes? If there is a marked increase in pressure it may just be the vales need re seating. HTH J
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