The Bolens 850 sometimes stalls and does not want to start back up. The generator will just hum and will not have enough power to turn the engine. The Amp meter jumps between 0-5.(What should it be?) Other times it runs fine. The output on the battery was about 12 volts and at starter generator about 5 per the volt meter. Any ideas? By the way the advice about adjusting the rear end play solved my issue with transmission jerking.