lack of power?!

[BoatDoc]

i modified a y534 for my nitro hammer. last week i could spin the prop at full rpm's. today the engine wouldn't push it at all. when i first tried the prop out, it would flip the boat, so i decided to try it again and play with the trim. but now i can't spin it. what the heck is going on here? by the way, i've still got enough power to spin the crap out of the stock prop.

[Chris LaPanse]

What is the problem? Is the drive train binding, is it hitting on something, or does the engine just not have enough torque? :confused:

[Hydro Junkie]

You say you modified a Y534, in what way? Did you cup it? Did you cut it down? I think we all need more info to help you on this one :confused:

[BoatDoc]

it's cut, a lot! i brought it down slightly smaller than a stock hammer prop. when i first tried the prop out, it turned my boat into a ballistic missle. if you know anything about the other mods to the boat, it's already a handful to drive. with this prop the boat wanted to flip. so i took it off, then i decided to try it again, and couldn't push it. and then, i realized that i had a massive brain fart...cuz i should have realized that i was using fuel with a lower nitro content then what i usually use. so i think i just answered my own stupid question!

[Ron Olson]

I happy to hear that you figured out the problem. When changing props, sometimes youhave to re-adjust the needle too, richer for a larger one, the opposite for a smaller prop.
For different percentages of Nitro, richer for higher and leaner for lower.