Ok, anyone who has read this post:
http://www.kiwibiker.co.nz/forums/sh...882#post578882
will have a good idea of the problem and my question, but to recap:
I fired up the VTZ this morning, and managed to get the engine running on both cylinders. A small victory.
It ran fine for 2-3 minutes. I left it running to get it warmed up and generally get things up to speed, lubricated, blow out the cobwebs, etc.
Then, after 2-3 minutes I noticed the revs were rapidly increasing from idle to full bore, without me touching the throttle or even being anywhere near the bike. There was also a sodding huge cloud of white smoke pouring out the back of the exhaust.
So I shut the engine off sharpish. After a couple of minutes I tried to turn it over on the starter motor. The engine appeared to be 'sticking'. That is, not turning over, or it would turn over once or twice, and then stick again.
I took the spark plugs out, and spun the engine. It spins fine on just the starter without the plugs in, but flung out a fair bit of viscous goop that looks like oil from the cylinders. This and the smoke makes me think that somehow there is quite a lot of oil getting into the cylinders and causing problems.
So, the question is:
Does this seem like a correct analysis?
If so, what is causing it, and how do I fix it, assuming it is fixable, and isn't terminal?
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