Graham, it has 17,200 miles on it. On Saturday, November 9, 2019 at 1:18:55 AM UTC-7, kiwinPA wrote: > > How many miles on your bike? Graham > > On Fri, Nov 8, 2019 at 11:13 PM aajawo <aaronjw...@gmail.com <javascript:>> > wrote: > >> So I've been thinking about doing the top end on my 1983 Nighthawk 650 >> for a few reasons. The compression on all four cylinders is a little low >> at 120 psi. That is tested with the engine warm and throttle wide open. >> The shop manual spec is 170 psi. But, correcting for my elevation of 7,000 >> feet, that would be more like about 134 psi. So maybe 120 psi isn't too >> bad??? >> >> Also, I'm getting oil in the drain tube that comes off the separator tank >> attached to the the crankcase breather - maybe an inch of oil will collect >> over the course of a 50 mile ride (pictured). The airbox which is connected >> to the separator tank also has oil in it. My guess is that I am getting >> some blow by past the rings which is forcing vapors out the crankcase >> breather into the separator tank and airbox where they collect. >> >> The bike doesn't visibly smoke, but I can smell either oil or unburned >> gas when I let the bike idle in the garage. >> >> The plugs don't look too bad - a little too brown maybe, but dry >> (pictured). >> >> Originally, the number 2 cylinder was only reading about 105 psi. But >> now that all four cylinders are at 120 psi, I am having second thoughts >> about doing a top end. >> >> The top-end job would include a cylinder hone, new rings, lapping valves, >> new valve seals, new gaskets, and anything else I might run in to. >> >> I think I could do it myself. I already have a top end gasket kit. >> Rings would be about $100. As long as I don't run into other issues, the >> cost isn't too bad. >> >> What do y'all think? Is it necessary? >> >> >> >> -- >> 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 nighthaw...@googlegroups.com <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/nighthawk_lovers/d584d518-3f7d-40db-951d-131bc7880e0c%40googlegroups.com >> >> <https://groups.google.com/d/msgid/nighthawk_lovers/d584d518-3f7d-40db-951d-131bc7880e0c%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >
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