This is a good site to see different mph for gear and sprocket setups. https://www.gearingcommander.com/
You are probably running -1 front and +2 rear 15T/45T if site is accurate.
at 70mph in 6th gear with stock gearing you'd be around 6250 rpms
All 4 not getting spark? Did it just go bad all of a sudden? Might be the CKP / pickup coil behind the right side engine cover. If the bike starts and runs on 2 or 3 cylinders then it is not the pickup coil.
The connector is under the tank. Not sure if it is possible but maybe you connected...
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