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Is it best to break in an engine stock and then modify it or make modifications then break it in?

I'm currently about to start my second engine build and wanted some input from more experienced karters. Over the last year I have been slowly modifying a Predator 212 non Hemi on a murray explorer yard kart. This has been my first build ever and I've learned a lot from this forum...

Hello, I was just curious if it is ok/safe to reuse an ARC billet rod on a new Predator 212 after my current engine is worn out? Could I just get new bearings check oil clearances and use the old billet rod? Anyone have any experience reusing one or breaking one?

Hello, I have recently been restoring and upgrading a Murray Explorer yard kart and wanted to say thanks to everybody in this community who helped me out with this project. There is not a ton of information out there on them and I often found myself frustrated with some aspects of working on...

Hello all, I'm hoping you guys can send me in the right direction. I'm popping non stop on deceleration. I'm running a predator 212 non hemi with mods on a Murray Explorer with a 10 tooth gear on the jack shaft and a 60 tooth on the axle. Here is a list of mods: billet flywheel, billet rod, mod2...

Hello, I'm looking for a part like this . . I'm not sure what to call it (grommet maybe) or where I can find one. It's where the throttle links to the go kart frame to hold the cable sleeve in position. It's on a Murray Explorer and it's a pain to set up throttle without it. Thanks for any help!

Hey all, I tore the original fuel line on my Predator 212 plus it wasn't long enough to reach my new carburetor anyways and I'm having a hard time finding the correct size replacement line. Is it 5/16ths or 1/4 inch? I'd like to get some transparent red line but at this point anything will do. I...

Hello, I have some questions about my engine build and was hoping for some info/advice from y'all. I'm currently running a non-HEMI Predator 212 (on a Murray Explorer) with the governor removed, stage 1 air filter, .038 jets in the carburetor, 18lb valve springs, and a header pipe. Now, I'm...

Hello, I'm still working on that ol' murray explorer! I have a quick question. Are these spindles installed correctly or upside down?

Ok, thank all of you who helped me get this far with my stuck pulley on the Murray Explorer (model# GT6O503X92A). I apologize for posting repeatedly about the same subject but I want to get past this so I can continue on my go kart restoration adventure! At this point after trying all of your...

This pulley is supposed to slide freely off the shaft right? I cant seem to get it unstuck. I've used penetrating blaster, heat, and a gear puller and it won't budge. Any ideas? Stuck torque converter pulley https://imgur.com/gallery/kqVuPLy

So I recently purchased a Murray Explorer with a Tecumseh OHH60 motor and a comet 30 series torque converter. I have a few questions and issues. 1. The kart jerks pretty hard when throttling up from a stop. Is this because of the torque converter? 2. The top speed with me (185 pounds) in...