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I put the first hour on all the bay boats we sell with 4.2 yamahas on them. 200SHO to a 300 OffShore all get the same break in. When they come back for 20 service we dont have making oil issues....

Its 6 yeas old with only 24 hours it never got broken in properly. It obviously sat up for quite some time then went through a hurricane.

So tell me again why a 6 year old neglected motor should...

JA jet
LA 20 inch lower
XA 25 inch lower

Why should Yamaha warranty a 6 year old motor that you bought used. Probably came off an insurance auction boat from Harvey lot of junk out there right now.
Probably best to get a reman block they...

http://www.shop.hydrotecmarine.com/product.sc?categoryId=10&productId=64
http://www.shop.hydrotecmarine.com/product.sc?productId=80&categoryId=10

Updates??

Not the same exact boat, same hull with different power. Have tried same props on both set ups.

I think if it could be done with mapping someone would have done it by now. I have run the same hull with the F300 and 250 SHO the 300 squeaks out a little more speed but is gutless compared to the...

Horsepower is a measurement of work done in a certain amount of time, wind the engine up an extra 1000 rpm and even if the force of the work is less (torque) horsepower can go up.
You can not...

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I saw that, which is why I asked about the cams. If they remapped the flat spot then they can remap for engine mods if there are stages of performance upgrades
in the near future it would make more...

I'm in the same boat, simon flash made a difference in mid range and gave me a little better top end, but the torque goes flat at 5200. Is the Hydro-Tec program addressing this issue?
I am running...