strange vibration ..... Yamaha 25 hp 2 stroke 1998

bag007

Seaman
Joined
Dec 26, 2007
Messages
72
Hi... Ok... heres my problem..... went to river today. emotor started first pull and idled really well... Ok.. put it in forward off we go... at about 1/2 throttle.. felt a hesitation and a wierd vibration... throttled back and it went accellerated boat up to 3/4 throttle and it was ok.... then I slowed down and then speeded up..... it hesitated a little,,, and then took off.. No problems for a few cycles of speeding up then slowing down.. Then it did it again same weird vibration which again went after throttleing back then accellerating... All in all it did this four times.. Now I have a problem with the darn spark plug lead connectors they are the springs and come loose.... could these casue this vibration... The carbs are clean..
I checked the prop... but if that was the problemm wouldnt it happen at all speeds?? All i can say is the vibration was like a prolonged shuddering...
Thanks for your help
 
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