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Hello! I just finished a go-kart build with a rear engine 420 with a flywheel, cam, pushrods, springs, con rod, intake, and exhaust, and I am having a bunch of issues with my exhaust overheating. I'm also running stock carb with a large jet and a cone filter. My head temps during hard runs only...

Hello! So I'm finally doing it. I am building my Predator 420 with almost everything. I have a billet flywheel and 65lb dual valve springs that are causing me problems. I think the flywheel problem is pretty simple. I want to figure out the timing of the stock flywheel so I can make sure I...

Hello! I just got a gx390/predator 420 billet flywheel, and I do not see any teeth on it for the electric start... Go Power Sports: 1, Me: 0. I am looking around and found that I can buy a gear to bolt on from ARC racing. On ARC, it says its for the Gx390. Should this work? I really don't want...

I think the title says it all: What would be the safest theoretical redline for a stage 2 predator 420? (Bilet rod, cam, springs, intake, jet, flywheel). I read all over the place, and some people said they've gotten to 7k rpm with no problems, while others say anything above 6 will grenade the...

Hello all! I am a highschool student working on a go kart project and I recently got offered a Kohler 725cc V twin for free from an uncle. Thats all besides the point, I need a torque converter that has a 1 & 7/16ths inch bore and can handle around 20hp (minimum). I looked all over the internet...