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When you say it runs well in the tub, do you mean it revs up ok not under load.Just wondering if the advance and retard mechanism is working. If it is not reving up, start the engine in the tub, squirt some petrol into the air intake as you open the throttle, if it revs, then the engine is being starved of petrol which would indicate a blocked jet or fuel filter somewhere.Was the engine running ok last time it was used, if so, any petrol left in the carbs over winter could have solidified into jelly causing a blockage.If all else fails, could be the trigger switch or the stator under the flywheel.
When you say it runs well in the tub, do you mean it revs up ok not under load.
Just wondering if the advance and retard mechanism is working. If it is not reving up, start the engine in the tub, squirt some petrol into the air intake as you open the throttle, if it revs, then the engine is being starved of petrol which would indicate a blocked jet or fuel filter somewhere.
Was the engine running ok last time it was used, if so, any petrol left in the carbs over winter could have solidified into jelly causing a blockage.
If all else fails, could be the trigger switch or the stator under the flywheel.
