How many miles on your bike? Graham

On Fri, Nov 8, 2019 at 11:13 PM aajawo <aaronjworst...@gmail.com> 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?
>
>
>
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