Wow that was a big change in compression! Good to know. 👍 Sent from Yahoo Mail on Android On Wed, Apr 24, 2019 at 10:44 AM, Darin Hatton<[email protected]> wrote: When I got my 700s fired up for the first time #1 cylinder wasn't firing. Compression check showed 80lbs in that cylinder. My problem was stuck piston rings from sitting for years. I mixed acetone and atf 50/50 and poured into cylinder, let soak for a week. This brought compression up to 120 , cylinder is firing and no more smoke. Got to change oil after the soak as some , if not all of the mixture will end up in crankcase. Darin On Tue, Apr 23, 2019, 10:32 PM Graham Rogers <[email protected]> wrote:
100 psi is not bad, bike should run. Something else is going on Sent from my iPad > On Apr 24, 2019, at 6:03 AM, aajawo <[email protected]> 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 [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/nighthawk_lovers. > For more options, visit https://groups.google.com/d/optout. -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/nighthawk_lovers. For more options, visit https://groups.google.com/d/optout. -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/nighthawk_lovers. For more options, visit https://groups.google.com/d/optout. -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/nighthawk_lovers. For more options, visit https://groups.google.com/d/optout.
