My goal is 45 from a stock parts kit/no aftermarket performance parts. That means no jackshaft as well, which would make it easy!
Did 41 on a stock DIY triple40 on a Hyper with just some upped compression, a trimmed base gasket to unblock transfer ports, drilled exhaust baffle, vented clutch cover, and an NGK plug(only part not from the kit is the NGK plug, which I swap to after the first start).
Working on one that will be the same but a fully ported jug, a few other tricks, and more mods to the exhaust. I basically am just curious on how fast you can go on an all stock kit with no aftermarket parts but with any mods allowed. The limiting factor IMO is the stock muffler...with no scavenging effect the top end is really neutered so its hard to rev em enough to go fast.
FWIW my generic motors rarely did over 32mph stock on the same exact route. Most were 28-30 (although that was with 44t vs 36t rear sprocket.)