Rightyo there's been some progress today. The easy simple bit was putting some brake fluid in the front brakes and bleeding up some sort of feel to the lever. It's sitting in the shed with a cable tie on it now we'll see how it is tomorrow.
I got the carbies off and cleaned them up as much as I could, got the floats off, needle and seats out, main and pilot jets out, choke plungers out, blew everything out with air and carby cleaner, and reassembled them and put them back on.
Replaced the spark plugs, which it looks like the previous owner did as well, the ones that came out looked pretty new so I have a good pair of spares
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Pulled the exhausts off as well, and bought some caustic soda to flush them out with. Interestingly when I was moving the bottom one (the one that runs, the front cylinder) into the garage to start the cleanup this happened:
There was quite a bit of oil in there...
The baffle I don't think will come out...
I'm gonna fill the chambers with caustic soda and see how much weight they can lose, I had to undo the rear subframe to get the rear exhaust off, this pic is looking forward towards the engine with the battery box and right hand coil removed, it's fun to get out:
Oh yeah and if anyone tells you that the only difference between one battery and another is that the vent pipe is on the other side make sure you don't just settle for the wrong one, I had to cut the vent outlet off:
This big hole is for the vent pipe bit to stick out and there's no big hole on the other side
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Once the exhausts are clean and back on I'll kick it in the guts again and report back...