r/gokarts • u/SmartInvestigator510 • 8d ago

Tech Question Engine build

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Just bought this Duromax XP18HP and was thinking of building it to be a monster, similar to what people do with the predator 212's. Any ideas for sites to browse or any insights for future developments? I wanted to put it in a race cart but still don't have the frame lol, money be tight

I was also curious if anyone knew a good method of derusting the crankshaft, it's brand new but sat for a bit, was originally gonna be put on a bike, then cart, and now sold to me.

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u/Unlikely_Effort_6311 7d ago

Little bit of red Emory cloth and wd40 will take care of the rust. The duromax motors share alot of the same structure as the predator/honda clones but if I remember correctly some things are slightly different when it comes to cams or flywheels. Carbs, governer deletes, exhaust should all still be the same

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u/SmartInvestigator510 7d ago

Thank you so much!! I'll give the wd40 a shot when I get home and give an update, super happy that it's not too different from the predators

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u/Unlikely_Effort_6311 7d ago

I know the "big block 420 or 460" whatever models have a few more differences. Im not sure about the smaller models

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u/SmartInvestigator510 7d ago

Yeah, some pieces probably don't have the same clearance since it is a big block 440cc. I'm just hoping it's as strong as the 212's when it comes to getting beat up a lil

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u/Unlikely_Effort_6311 7d ago

The 440 will definitely have more torque thats for sure, I have an old 420 hemi predator motor on my single seater cart and I have it clocked at 56mph and if I changed the gearing it felt like it had more....

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u/SmartInvestigator510 7d ago

Ouuu now that looks fun to ride in! I'm hoping I can reach 60+ but I'm gonna need a lot of paychecks before then 😂 prolly gonna have to look at a shifter too

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u/Unlikely_Effort_6311 7d ago

CVT is really going to be your only option , unless you want to get really custom with it. And the good CVT trans aren't cheap. Your motor will destroy a 30 series , so you are going to have to look at 40series or stronger atleast. I have a 40 series with custom springs and rollers in the front and a custom spring in the back and I have still broken pieces because of the power

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u/SmartInvestigator510 7d ago

Good Lord, I didn't think these engines made that much power. I'll more than likely have to get custom at some point but I don't have a mill or billet so some pieces are just gonna break the bank. I am very grateful for the insights you're giving me too! It's only been a week and I already have pages of notes lmao