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How to diagnose burnt valve
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How to diagnose burnt valve
Curious to know how I can diagnose a burnt valve on my 79 gs425.
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Forum LongTimerGSResource Superstar
Past Site Supporter
Super Site Supporter- Mar 2006
- 35620
- Torrance, CA
Bad compression that doesn't increase when you pour a teaspoon of oil in the cylinder. To do a proper compression test you should have a warm engine and hold the throttle wide open. Of course this assumes the bike runs. Oh, and always adjust the valves before doing a compression test otherwise the entire exercise is a waste of time.Ed
To measure is to know.
Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182
Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846
Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf
KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection
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Google leak down test.Current:
Z1300A5 Locomotive (swapped my Intruder for it), GS450 Cafe Project (might never finish it....), XT500 Commuter (I know - it's a Yamaha :eek:)
Past:
VL1500 Intruder (swapped for Z1300), ZX9R Streetfighter (lets face it - too fast....), 1984 GSX750EF, 1984 GSX1100EF (AKA GS1150)
And a bunch of other crap Yamahas....
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Gs425FridayHarbor
Thanks all. Just soaked carbs and did rings and she fired up pretty well. I'm going to do valve adjustment this week and then will try compression test. I already noticed plug in cyl 2 is oil fouled but will swap plugs out after adjustment and probably be back for more help. Thanks.
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