ORIGINAL: NM2K
The Sanye 1.08 was designed to top out in the high 8k rpm range. If the engine is running at over 9k rpm, it is under propped. Stick to 5% nitro or add a head shim to stop overheating in the summer. These are great engines and no, they are not OS clones.
Ed Cregger
Uhh, no it is more like 9K underproped when hitting over 10 K. Ed was right about the prop selection. I just forgot that the older ASP Red Head has higher compression.