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That kart and so many others has the one thing I wish I'd incorporated into my (almost) everything build, that FNR tranny.

I love new bearings, but not for themselves. I love them for the violence they allow me to apply to the old bearings for removal.

My kart pictured above? My harnesses actually came as 4-points, but for build reasons I put the shoulder straps under a single bolt instead of under 2 bolts. so yeah, 3-point harnesses now. The long reach over the top of the "roll bar" now will keep you in the straps that way. Meanwhile, it...

Not at all sure a top end speed increase from 28 to 35 mph would be worth the trouble and maybe also the cost for you. Think in terms of ratios, of gives and takes............. If you'd be willing to sacrifice some acceleration off the line to get more top end speed, then redflash already gave a...

Very clean-looking kart, seems to be all there. Looking for parts? What kind of parts did you have in mind?

Mystery solved, you're missing parts. Parts that made the motor mounting on the swingarm strong enough not to flex. Mounting the jackshaft plate on the rearmost 4 holes on the swingarm allows for tensioning movement (slots), and positions it for mounting 1 or 2 sprockets on its...

Is that a new motor mounting plate with a jackshaft? Whatever the motor is mounted on, it absolutely must be as rigid as anywhere else on the frame is. I'd guess almost anything could improve things over the rubber bands it's mounted on now.

What language is that? My computer can't translate it. Angles, angles, angles, I love them all, can't get enough. All of those angles from the short brace pieces and from the frame itself mean strength through geometry, not through the extra weight of heavy steel. Good job.

The high center console helped a little (those lower ribs are permanently caved in), but when I totaled the 280ZX it was the lap belt part of the factory shoulder harness setup that kept me from shooting out of the exploded passenger side window. Just in front of where I folded the car in half.

It's like I said about the motor mounting plate...............While your swingarm does jump up/down a little while the chain is skipping teeth, it's still like Pancho said about the engine and swingarm moving in unison, that ain't it. In the rear shots of the acceleration, you can see plain as...

F.A., have I thanked you lately for all the stuff I'm learning about batteries and controls from you?

Chain and sprockets alignment looks good, teeth are sharp, guessing you've got good chain tension when parked also. That only leaves flex and/or twist in my mind. Like under load, the motor mounting plate (which is kind of long) flexing down towards the axle a smidgin bit, which loosens the...

If you mean how long a piece of 3/16" keystock do you need, the answer is "more than you need". Just get a12" long piece of keystock and cut it to fit exactly the way you want it, and slightly round the end corners to ease fitment. All you need is enough to completely fill the entire lengths of...

Should it be assumed those are just for checking in the shop, not while driving? My Magoo eyes would never be able to read those in the glaring sun while they vibrate on the steering wheel or wherever.

Yeah, that was it. Only billet flywheels I found when searching that way for the dual magnets were just like that, 1 for the ignition only.

Just ran the orthopedic scenario in my head. Isn't it the lap belts' job to keep your back cheeks planted in the seat (nothing pulling down on your clavicles), and the shoulder belts' job to keep you from spilling out sideways, much less snapping forward? The upper cervicals (neck) should catch...

I learned on the old Regency sand dunes here in N. FL. about the advantage of a big 4.50 super knobby rear tire on my first thumper bike. Same lesson applies to karts and sleds too. The wider and deeper cut of ground contact you can get, the less you'll La Brea out of sight.

If the grandkid gets the fun of having it and the super fun of driving it, the grandpa should get the fun of building it and the super fun of doing it from scratch.

Does that say "chrome vanadium" on the sides of those sockets? I think Denny nailed that one. I've found plenty of individual sockets and wrenches that were sized in ?/32 inches, most having been rusted and/or stripped and/or even broken. Have kept several. Thing is, if you required that...

TUNING TIPS: How Ackermann Adjustments Affect Kart Performance - POWER REPUBLIC - YouTube Go-Kart Steering Knuckles | TYRANIS TIPS - YouTube Front Suspension Geometry| EP. 3 Ackerman & Toe - YouTube