How is durability at high rpm with a sleeve from Schnitz?
Lore is that running the stock sleeve at 5000+ rpm causes ovalizing and oil use.
"Lore," IMHO, offers a slippery slope for modification guidance!
Example: During the '08-'09 excessive oil consumption epidemic, "lore
" declared: Engines cylinders developed oval-shaped cross-sections, and consumed excessive oil, primarily for two reasons:
1. They did not have PCV valve mods executed, and:
2. They did not have Thermo-Bobs installed.
This "lore" became undeniable, inerrant, "tribal wisdom," even though KLR650s had over 20 model years of production without oval bores/excessive oil consumption issues, although denied PCV valve mods and Thermo-Bobs.
So, I have no relevant experience/observation of ovalized, excessive oil consumption from running a stock sleeve greater than 5000 rpm. I DO have evidence of at least one 16,000-mile stock sleeve run for considerable miles over 5,000 rpm without excessive oil consumption; the bore may be entirely egg-shaped in cross-section, but . . . what? Me worry?
Maybe "lore" has it right; I don't know. I'm incompetent to say, "Just run it! No problem!" I wouldn't want to take responsibility for a recommendation that might truncate your service life, or result in catastrophic failure. I'll dance with who brung me, a stock sleeve at high rpm, but--that's just ME!
Comparing apples and cumquats, but--my KLR250 sees 9,000 and more rpm regularly on its stock sleeve; about the same mileage as the 650, and the same performance and lack of oil consumption as always; YMMV!