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Trying to understand how 35 and 219 chain differ
the sprockets wont interchange is what gets folks mixed up, 219 is a tighter pitch than 35 so you cant just swap chain and keep the same gears. race crowd likes the lighter 219, backyard karts usually have 35 cause you can get it anywhere. I reckon class rules settle it more than anything, you running a heavy kid on 219 or does that chew it up?
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Before you order chain or pull a sprocket, check the pitch on the gears already on the kart. 219 is a tighter pitch than 35 so those sprockets will not interchange. That check rules out buying a chain that cannot mesh.
35 is cheap conveyor-belt chain and it usually arrives with a master link. 219 is the better race tool. It is lighter, it deflects less, and it is more efficient at the same ratio. The fancier talk can wait until the pitch is confirmed. A heavy driver is not what usually wrecks 219. A dry chain or a 35 sprocket left on the axle will take it out first.
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Number 35 is 3/8 inch (9.525 mm) pitch and 219 is about 7.77 mm, so tooth spacing and roller diameter do not match and the sprockets cannot interchange. Gear ratio remains axle teeth over clutch teeth regardless of pitch. Pitch only changes the pitch-circle diameter for a given tooth count, the required center distance, and how polygonal the wrap is (chordal action, a small speed pulse once per tooth).
The idea that 219 wins on acceleration because it is lighter is mostly folk wisdom, since wheel and driver inertia dwarf chain mass. What does scale with a heavy kid is shock load at clutch lockup and curb hits, and 35 simply has larger pins and side plates, which is the usual reason junior rules specify it rather than any lap-time effect.
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What I'd look at first is whether the motor's sittin square to the rear axle. That little 219 chain ain't got much room for a crooked mount, and on a rough oval it walks and you start wearin the plates instead of the rollers. 35 will put up with a cockeyed motor a lot longer.
Dust after a dry night cakes in worse than folks think, and if you oil over it you just made grinding paste. Blow it out first then a light lube, that dog'll hunt a lot longer than drownin it in oil.
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