Originally Posted by scratch-boy
Sorry that was a fat finger moment on my part, the engine number is 9252652 so if my research is from a good source the engine is 71, but looks to have been loved. There still seem to be parts about but wanted to check it in the water hence the desire on the tubes.
Wow, I think I might go buy a lottery ticket!
The ironic thing is that I thought mine was an 80s model, but having had it dismantled down to it's piston rings I now know someone put a later livery cowl on it!
I think those engines tend to be either 100% OK or long dead. I don't think there are many "iffy" ones out there, as they tended to die quite conclusivley, so many cooked themselves or gubbed the pistons with too much spark advance. (worth getitng some shrink wrap or tape round the free end of your spark stop screw. Locknut on mine let go & it unwound. The engine stopped as the spark plugs were shorted by the metal that came off the top of the piston at what turned out to be about 38 deree advance!.....
The top cyls on them tended to run a bit lean, I believe if you up the size of your top carb jet by 2 thou' (according to the Ishop parts lists) it helps cure that. If you pull all the plugs, make sure the top one isn't spectacularly less oily than the lower two. (I'm not sure if that problem only happened with the later CDI ignition, so you may be OK, but worth a look) If so, get the next size up jet - they're only about a fiver.
you'd be amazed how many official OEM spares are actually avaialble considering the age of them - and plenty of aftermarket stuff too.