I got that K-star up to 49MPH once, I believe with 15-43 gearing. I didn't really like the feel of it revving the shit out of itself, felt a bit forced. Like it didn't come natural.
How is it eating pistons? Is it scraping em off or is it seizing them? And where does it leave marks? I recon you know I seized that kit once (While starting it) but it left no marks then.