2010 Apex ?'s

[MX Jeff]

We have an Apex 50cc. What does it take to upgrade the engine to 90 or 100cc. My son hasn't ridden it in 3 years, and now he's 11 years old and weighs 105 lbs lol. 50cc's isn't going to cut it for him.

[chris p.]

hey jeff. you would have to get new cylinder,piston and I believe a crank too and don't quote me but you may need new cases also but hopefully someone here could give you definitive answer. or you could buy my malossi 90cc engine lol it's in the parts section and i'll give you a good deal as we're done with minis

[ontargetracing]

best bet is to buy a complete 90 or 100 engine...