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Advice on a 1979 Convert

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Fraser:
Hi lads,

Here is my first post. Purchased a 1979 V1000 Convert, sight unseen via our local version of eBay, it was supposed to have been a “good runner”, it was also in the first stages of being converted into a cafe racer so many body items were removed in anticipation of replacement. The original items all came with the bike. However, it appears that the bike had sat for a few years, so lubricated the cylinders before starting, removed and cleaned the carbs, petrol tank, replaced fuel taps, petrol filters, fuel lines, spark plugs, air cleaner etc. Now at the stage where everything is back together and the bike running, it always starts first time.

But here is the issue; the crankcase is being pressurised and oil is being discharged from the base of the rubber plenum attached to the air cleaner. Also, the L/H cylinder was very smokey some times when it started, so thought that the piston rings might be at fault. Have done a compression test (motor cold and throttle fully open) to try and verify the thinking and we get 160 psi for l/h and 180 psi for r/h. Put a little oil in the l/h cylinder and the pressure jumps up to 200 psi, so am thinking that the rings are at fault.

My question is; as the bike sat for a few years is it possible that the rings are just “gummed up” and some regular use would get things resealed, or is this just wishful thinking on my part and I need to face reality and replace the piston rings? The bike has done just over 58000 miles.

Thanks for your help, cheers.
Fraser. 

dblue:
check the crankcase ventilation valve, may be rusted shut.
Dave

rodekyll:
Hello, and welcome.

The problem is that your bike is in NZ, and is therefore upside down.  We expect oil leaks when the bike is in that position.  The correct fix is to send it to me where I can right it and ride it.  No, I don't charge for the service.

rodekyll:
Seriously though, the smoke isn't an issue yet.  You've got several weeks of condensation and goo built up in the mufflers.  It will take a few rides to blow it all out.

The compression is possibly an issue.  I don't think it would hurt to crank the pistons down in their bores and soak them in marvel mystery oil or whatever the upside-down version of that stuff is.  Then ride it a little (maybe until the smoking stops) and see what you've got.  If the compression continues to be wonky, then a leak-down test is in order.

oldbike54:
'One question RK , as one of our 'Vert 'Sperts , why don't things simply fall off the planet in NZ and 'Stralia ? I mean , what's holding them on  ???

Seriously , Blue is on to something , and it could just be stuck rings .
 
  Dusty

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