Well my engine comes with the 415 chain and the 410 chain is only bike chain that will fit over the shift kit chainring to bicycle gears the mountain bike chain doesn't even fit over the sprocket teeth so no its not to put on the engine part it makes no sence to downgrade the engine chain instructions say to use that chain replace the moubtinbike chain to fit the chainring teeth
yea i think the only thing can really do is go buy an extra 410 chain to add links to the 1 that came with the kit o make it longer as it is a short chain for a bmx its to short to go through the derailleur and around the gears and reach to connect around the freewheel sprocket in the front chainring so looks like i will have to wait till payday to buy the additional chain i wish they would send it in the kit or suggest purchasing 1 as you will probably need 1 unless you get a extra long chain to begin with in the kit but for me on a standard mountain bike the single chain is way to short so will need to make it longer
