800cc 680 engine compression
Looking into buying a 680 ultra engine off a guy. It has an 800cc big bore kit, and he sais it has 13.5:1 comp. SLP heads. Just wondering what the cylinder pressures should be with those. He sais it has 145 across, but I would think it should be higher, especially tested at low altitude.
Let me know if you think this sounds right, or should it be higher.
Also wondering what kind of power this should make? It has engine porting done, 38mm ported carbs, ufo inserts, v-force III reeds, pipes.
170 -180 sound about right???
'03 RMK 800, 159"
'96 Ultra SP 680, a few mods, 144" Leaves the nutsack dragging behind in the snow.