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Hey guys, so while looking for parts for my minibike project I found that simple, small aluminum gas tanks are ridiculously expensive! So I decided I'm going to make my own line of high quality, aluminum gas tanks. They will be 100% made in the USA, I'm going to use all billet parts and very...

Ok here is my 2021 build off log. Im completely scraping this coleman, the frame has been shot to crap (it has snapped/ cracked in 8 different places). So I am scrapping the seat, engine, and tires. I am going to make a new HD frame out of all the steel tubing, flat steel, barstock, and square...

In an effort to get away from the predator 420's measly 8:1 stock compression ratio I am looking for a high comp piston 12:1 or more. I have found a few 90mm wiseco pistons and namura pistons but I cant find the wrist pin size, can anyone point me to the direction of a high comp piston that...

Here's my red springs from my 40 series. As you can see the one on the left is bent / streched, the middle one snapped, and the one on the right looks fine. Any idea what caused this or how to prevent this in the future?

Hey guy, where I live in Phoenix it normally gets over 110 degrees in the summer. I am looking for an additional way to cool my air-cooled 420cc. Could I use a pulse pump to run oil through a filter and radiator? I dont see why not. Links to what im thinking of using will be below. Thanks pulse...

I have gone through at least 4 gx390 pull starters on my built predator 420 in the last 5 months, with the rope and plastic breaking. I want to see if other people are having the same issue.

Hello all! I recently noticed that my predator 420 lost some compression and started burning oil (due to dust getting in the engine, where I ride in the desert the dirt is as fine if not finer than baby powder and I previously didn't have an oiled air filter), so I changed all the rings out for...

I just found this pic on the internet :smiley_omg:🤣

Hey guys, I am looking to change my driving sprocket on my 40 series, thinking of bumping it up to a bigger sprocket either a 12t or 14t. Anyone try this yet? and if so what kind of gains have you had speed-wise? I ideally want more top end with medium torque on the bottom end. Thanks!

Hey guys! I recently bought a mill and was thinking about milling my predator 420's head down a few thousand along with a thinner head gasket. Any thoughts on this? Comments, concerns, and tips welcome! I just would like any helpful info on what I might be getting myself into before I start...

Anyone know where I can find extremely strong bolts? this grade 8 zinc plated one failed after about 2 weeks of use. I am looking to avoid the below situation.

anyone else have this issue? Noticed It when the TAV started making a 'clicking' noise. Videos : https://drive.google.com/file/d/140FeWM8u9BNgaeumTOaTnrU2Ln1RwBS2/view?usp=sharing https://drive.google.com/file/d/140HoO0sRBopiVWen_h94zzvbBeaVbQZl/view?usp=sharing...

Merry Christmas everyone! Hi I own a Comet 40 series TAV and I want to up the stall speed without paying for it, so I am going to shave material off of my stock heavy cam rollers. What I need help with though is the weight of the medium cam rollers (Comet part # 203649) could anyone here please...

I recently purchased a billet rod, billet flywheel, and 65Lbs dual valve springs for my predator 420 engine the only issue is I don't know the valve lash for this engine... anyone know the valve lash for this engine? p.s anyone have suggestions on what to upgrade next?

here is a link to my [kinda crazy] build: List of upgrades: custom FRAM air filter, Custom exhaust header, 4-inch stretch, rebar reinforced frame, ProTaper gold 420MX chain, custom engine plate, chrome breathers, chrome brake lever, full waffle grips, 420cc gas engine, 40 series GPS Comet...

Hello, I am considering removing the governer on my predator 420cc engine I would upgrade the valve springs and connecting rod but do I really need a billet flywheel? has anyone here ever had a stock flywheel burst? I see lots of people say you need it for safety but no concrete evidence that it...

Hi I’m looking for a new clutch for my 420cc predator but I don’t know what clutch I should buy. the Noram 1600 and Hilliard Extreme Duty look like good clutches. Any suggestions? THANKS!

[this is a continuation of this thread: https://www.diygokarts.com/vb/showthread.php?t=44308 ] please watch the video below and let me know how I can fix my clutch THANKS!:cheers2: (click on the yt link above the video screen clicking on the youtube icon will not work)...

[HELP] new Predator 420 stalls/knocks/surging/hunts ===========[THIS THREAD IS CONTINUED HERE: https://www.diygokarts.com/vb/showthread.php?p=556436#post556436 ]============ :mad2: Hi, i bought a predator 420cc engine about two months ago for my mini bike. I finally got it all put...

Hi Im looking to run a stock predator 420cc ungoverned but I dont know if I will have to get a billet piston rod like on the 212:huh: thanks!