Yamaha Guru Needed.

[brownies]

Currently have a 98 Vmax 2.6L 150. Max operating RPM range for the Vmax motors looks to be around 6,000 rpm.<br /> I was thinking about sneaking a 2.6L 200hp under the cover. (powerhead as an assembly with inductions system..carb/efi/hpdi..)<br /> I was looking at a saltwater series 200hp 2.6L for the donor engine, but, the max operating range on these is shown as 5500 rpm.<br /> SO, here's the question....<br />What's the difference in like models..<br />2.6L Vmax series 200hp -VS- 2.6L "other" series 200hp Yamaha's.<br /><br /> It seems 200hp isn't 200hp and the Vmax is the stronger performer....OR, Is that wrong?

 

[Canuck 16]

Re: Yamaha Guru Needed.

I believe the gear ratio in the lower unit is different in the Vmax from the regular V6 motors.<br />If the p-head on a regular 200 is healthy, you probably could'nt hurt it spinning it up to 6000.<br /><br />Cheers... Canuck 16.

 

[brownies]

Re: Yamaha Guru Needed.

My 150 gear ratio is 2.0:1. The 200/225hp Vmax and Saltwaters are 1.86:1.<br /> I'm thinking another 50-75hp will allow me to turn a more agressive prop, have more power to "get" me to 6000rpm quicker, and the higher ratio helps a bit on the top end as well.<br /> All this considering I can operate at 6,000rpm.<br /> What I DON'T want to happen is ending up with a 5,500 rpm motor, higher gears, agressive prop, and spending that kind of money and winding up with the same top speed (at 500rpm less).<br /> Just trying to gain as much insight into this prior to the attempt since things don't always work like planned.....

 

[Ray Neudecker]

Re: Yamaha Guru Needed.

Change the exhaust divider plate and tuner for ones out of a V-6 Special 85-86 model. Increase the jets to 165 and up timing to 26-28 degrees. 28 only if using fresh premium and you have over 200 HP with your motor.

 

[brownies]

Re: Yamaha Guru Needed.

I don't think the jets in my small bore, 98 model carbs, can be changed. I'd like to find some carbs off of a 200hp (larger bore and the jets "can" be changed from what I hear). <br /> What year range carbs do I need to be looking for?

 

[Ray Neudecker]

Re: Yamaha Guru Needed.

The jets can be changed in those carbs. Normally, I use an orfice drill to do this rejetting, since the jets are rather pricey from Yamaha. If I were to change the carbs, I would look for some off a Excell (87-89 model) or the V-6 Special (85-86) model. Either will give a larhe gain over the ones you have now. Those motors were also known as a 225 and 220.