Running but going nowhere HELP!

[Bigmorgs]

Hi,

I recently bought a used 2hp Yamaha outboard for my Canoe. It was running badly when I got it and the previous owner told me it needed a new carby. I bought a new carby and fitted it and it seems to be running nicely.

So the problem is when I took it out for it's maiden vouage the engine was running fine but I was bearly moving. I proceeded to increase the rev's and it didn't move any faster. But it did start to make a bad RANT RANT noise from the base of the motor were the leg starts as i increased the rev's and load.

I researched and have come up with the thought it might be the connecting rod slipping.

Anyone have any idea's form me??

Thanks for the help....

[Michael j]

make sure you have the right carb. Wrong main jet (to big or to small) may idle good but not turn up. a rod problem will normally kock all the time. An over propped motor can make odd noises when loaded. they make a alumnum & plastic prop. check pitch size and maybe try a lower pitch?