My last ride of the year was 7 days ago. I rode for 8 hours pretty much WOT most of the time and only shut off the engine to refuel and fix the only unreliable component of my build, the SBP shifter kit that requires a chain adjustment every 2 hours of use.
I've never heard that about the SBP shift kits. I've never used one because they're illegal in California. YEAH YEAH, I KNOW, A lot of guys in California use them, I'll explain why I don't. Almost any bicycle engine will get you to 30mph and thats plenty fast for a bicycle.(my bike hits 35mph.) Then, California DMV sec 406 says it must have an AUTOMATIC transmission. In other words, No shifting allowed. I really don't think the cops have caught on to this yet, but when they do it's gonna be over for SBP in California except for off road use.
Anyway, SOMETHING is slipping on your kit to loosen the chain like that. I'm sure someone will have a solution for that.
fatdaddy.