Help with a Nitro LX640 with 60 HP Merc

[RippnLipz]

Well you have a starting point now. Sounds like you were very under propped for one. Ideally your best option is to find someone with this prop so you can test before you buy, I would also test one pitch up. At about 4-500 for the mercury vengence prop its a bit spendy when you dont know exactly what you want. I see the 4 blade solas is under 200...I have heard a few guys say going to a 4 blade gave them some more torque. Im afraid you need to do some testing, which can be challenging without spending money.

 

[Larry]

Great! Maybe I could pick up a few on ebay (not used) to start. The lake is shallow with big stones here and there, so my props get nicked easily. Any suggestion how high to go up on the pitch from 13? Like 14, then 16?
I have to get the # off the engine and get a technician's manual like you suggested. Thanks again!

 

[RippnLipz]

I probably wouldn't go more than 1 or 2 pitches up, but it doesn't hurt to test if you have the prop to try. Depends on prop manufacture too, they all are a bit different. You will know if you go too high as you will not be able to hit max rpm( its key that your motor hits this limit. Start with boat trimmed all the way down, then when it gets out of the hole and bow drops trim up until you find sweet spot, you will hear and feel it when its there). Is your motor a 2 or 4 stroke? With 2 strokes you want the prop to be able to easily spin up into the power band, four strokes have pretty even power bands. Your tech manual will have a prop table like this with all the manufactures listed