Proof

Despite the bad weather we’ve been having down here we got a quick video of the AS1 up and running! With the new breakers and capacitors it starts with the very first kick, runs smoothly in idle and revs well. A quick pull of the throttle sends it up on the back wheel, not bad. The funny thing is that mechanically all we did was clean the engine out, replace the cylinder heads and put new spark plugs in place. The cylinder heads were even used ones that we had cleaned before! The carburetors did get a complete overhaul though, they were OK but it’s an easy thing to do and usually makes the bike run much smoother.

There is quite a bit of smoke coming from the left exhaust, both the exhaust pipes have been cleaned as good as possible, however since the left cylinder was running a bit off before (It was full of residue of something, no idea what) there is a good bit of oil left in the left pipe. It will burn off with time though.

A general tip when you’ve restored one of these old motorcycles: in all the guides and workshop manuals it says that you need to run the first tank of petrol with oil in it, this is because the oil lines are empty when starting the bike for the first time. This combined with the tight fit of a new engine means that it can easily cease and break when the temperature rises because of the added friction.

You can get around this by manually turning the sprocket for the oil pump until you see the oil reach the cylinders (At least it can be done with the Yamaha 125s), then it will be lubricated as usual when you start it, even for the first time. Though it’s a good precaution to have some oil in the tank just in case.

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