My ASP .12 engine is finally in my boat now and I took it down today to test the watercooling system (which worked, thank god). However, I had to adjust the idle to about 1/4 throttle just to keep the engine running in the water and when I went to 1/2 or WOT there was little increase in power and barely any increase in rpm. On land with the engine being cooled by a water tank, although with no load, the engine revved up with even just a blip of the throttle. If I hold the throttle open with the boat in the water the engine eventually stalls. Has anyone any ideas as to what is going on here? I tried both richening and leaning the mixture - all that happened was the engine stalled.
I'm running 20% oil (all castor), 10% nitro, 35mm waterscrew, MVVS throttle pipe.
Anyone any ideas? Thanks,