i got a 1968 harley golf cart!!love it alot used to drive it for hours on end around town on and off road...but it was running fine one day last year then virtually stopped running?? stopped looked it over; bypassed the inline fuel lilter> just to see if it would run?? with no success i had to push it homeso i started tinkering and if the cart was on a down hill slope it would start - run -and drive but very "sluggish" no powerany ideas as to what it could be?? i have cleaned and re-cleaned the carb and the spark is kinda weak ??