same here i got this one when they fist came out so 5 years as well and i have had not 1 problem with it, i got electric start, and no tune ups either. The gas is unbelievable to, i only fill it maybe once a year and it will run the whole season.
i have one i had it for 5 years now never tuned it up yet and it still starts first pull and i did every thing to this i even fliped it 3 time and it still runs great easily worth every penny i spent
right now only like 15-20 km/h but its ment for cutting gradd not a Go kart but u can take the blade off and switch the belts and it will then go like 40 km/h