I ordered the Earthquake 3.5. I want to upgrade this guy into a real beast. I found a .28, 4.5cc engine on Ebay for $92 that will uspposedly fit right in. My concern is an area that I know almost nothing about, gears. From what I read, I need to upgrade to a metal spur gear and maybe a new bell housing and possibly a better clutch with three shoes. With this being a 2-speed transmission, I'm not sure what all I need to get or the specific part numbers. I have read that he lower number of teeth means more punch and not so much top speed, and vice versa with increasing the number of teeth. I'd rather have this about equal I think. Can anyone assist and let me know hat I would need? Is the pinion gear the same as the clutch housing? Would I need multiple spur gears as it is a 2-speed? Is there a way to upgrade all gears? Supposedly the Earthquake comes with a Vertex VX .21 engine. I can't find any specs on this engine at all. I can't even find exact numbers of teeth on the gears that come on the truck. The manual I found online for the truck says "BS903-101 Pinion Gear 18T/19T/pin" and "BS801-014 Spur Gear 43T" , I'm not sure how it will perform. The manual says there is also a 40T/37T gear which I assume is for the 2-speeds. Sorry to rant, I just wish I knew a little more about these things. I'd love to make this truck have super take off speed, power to climb, and nice top end as well. Once I get it, I will post some pics. Here is the .28 4.5cc 3+HP engine I found on Ebay -
https://www.ebay.com/itm/3-HP-28-Ni...915390?hash=item1ce66be6be:g:JL4AAOSwWxNY1F2- If anyone has any advice or suggestions, please feel free to write. I'm in Western Kentucky btw. Thank You all.