Originally Posted by beerbelly
and run it on just petrol cos your weakening the afr putting oil in
Aye, it'll smoke like a Marlboro' red addict & not pull the skin off the proverbial rice pud, but I also ran in a premix 2- stroke on 25:1 for 60 odd litres after a total rebore rebuild and apart from cleaning the plugs (which kind of happened on it's own when I swapped to a 50:1 tank) it worked fine on the same plugs etc for the rest of the season.
Originally Posted by Poly
He's just rebuilt it. Normal run in procedure is 50:1 plus the autolube for the first tank.
Yep. Seagull mix is what you need for the first few hours! (along with a gas mask!)
No spark is likely going to be one of three things:
- dead coil
- dead trigger
- Short somewhere.
Now, I assume both plugs don't spark? I don't know your engine but I would be initially looking at anything wired in the stop circuit - could be overheat switch, stop button (some Yams had one on the side of the case) or possibly a low oil switch In the oil reservoir.
Remember the key switch also shorts the deadman circuit when in the "off" position.
I'm assuming you have separate HT coils on this engine? - If one of them (or the trigger circuits under the flywheel) had failed I would have thought only 1 plug would be "spark free". On a 2 cyl engine one down is usually enough to stop it. A 3 cyl it will run like a dog - just - if one cyl goes down. (don't ask me how I know!
Check all your kill circuit switches - plenty of Yam wiring diagrams out there...