Sounds like you have a bad valve guild in one of cylinders that is leaking oil and burning , that will give you blue smoke ! I went thought the same thing on my 83 650 . I found it easier replace the head from a bike with low miles on it , if you can find one ( ebay ) they do make rebuild kits if you can't find another head . I did end up rebuilding the whole top end and it has been running great ever since.
On Tuesday, April 23, 2019 at 11:03:31 AM UTC-7, aajawo wrote: > > So a few weeks ago I purchased a 1983 NH 650 to restore. It has 17k miles > and hadn't been started for years. I installed new battery and rebuilt the > carbs. The compression with cold engine was 130 PSI for all cylinders with > throttle closed (forgot to hold it open). At first it started up and ran > fine. Now it's blowing blue smoke out exhaust. Rechecked compression with > warm engine and open throttle and all cylinders at 120 PSI except number 2 > at 100 PSI. Can anyone office advice on where I should go from here? I > figure the top end is toast and needs an expensive rebuild with new pistons > and rings if not more. Oh and I've never ridden it. All this is with the > bike sitting on the center stand. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to nighthawk_lovers+unsubscr...@googlegroups.com. To post to this group, send email to nighthawk_lovers@googlegroups.com. Visit this group at https://groups.google.com/group/nighthawk_lovers. For more options, visit https://groups.google.com/d/optout.
