2 cycle RPM's???

DidIPutThePlugIn · 02-23-2008, 10:06 PM

I have a 2001 Yamaha V-Max, jet drive, carbureted, and I'm wondering what the safe rpm range is?

Currently there is room to adjust the linkage and add a good amount of throttle. At max throttle now I get up to about 5,200 rpm's. For hole shots in shallow water a little more could come in handy, but don't want to risk it if I'm at the peak range now.

Anyone know how many rpm's is safe? What do you rev. your 2 stroke up to, and how many rpm's do you like to cruise at?

Thank's for answers.

MattPark · 02-23-2008, 10:08 PM

How many HP is the outboard?

Also, on a holeshot, you might not reach full RPM until you get moving a bit, so you could theoretically give it full throttle and not do any harm that you might do if you were moving near your top speed.

DidIPutThePlugIn · 02-23-2008, 10:21 PM

Quote:

Originally Posted by MattPark

How many HP is the outboard?

Good question. 150 hp.

NWRedside · 02-23-2008, 10:25 PM

I've got a 2000 150hp VMAX with a pump on it. Max i get is around 5100. I actually asked the same question a few years ago on this board ( you can search for the thread) and feedback I got is that we're where we should be on the RMP's.

MattPark · 02-23-2008, 10:27 PM

Google is your friend

Clicky

Your WOT rpm range is 4500-5500.

DidIPutThePlugIn · 02-23-2008, 10:41 PM

Quote:

Originally Posted by MattPark

Google is your friend

Clicky

Your WOT rpm range is 4500-5500.

Matt thanks for the input, if I read the info on your link correctly it gives the safe operating range for a boat with a prop, not the safe range for engine damage. Also I have a pump not a prop. At 5,000 rpms with a prop my eyes would squirt out my ears.

The search feature on this board hates me. I tried a few different searches and came up with nothing relevant to my question. I'll keep trying.

DidIPutThePlugIn · 02-23-2008, 10:44 PM

Quote:

Originally Posted by NWRedside

I've got a 2000 150hp VMAX with a pump on it. Max i get is around 5100. I actually asked the same question a few years ago on this board ( you can search for the thread) and feedback I got is that we're where we should be on the RMP's.

Thanks NWR.

Tried a few searches no luck.

MattPark · 02-23-2008, 10:45 PM

The max WOT rpm range for an engine is the same if it has a prop or a pump. The safe operating limits of an engine don't change based on your propulsion method.

NWRedside · 02-24-2008, 11:44 AM

Quote:

Originally Posted by DidIPutThePlugIn

Thanks NWR.

Tried a few searches no luck.

Try this link: http://www.ifish.net/board/showthread.php?t=91189

ondarvr · 02-25-2008, 12:52 PM

For long life and good performance 2 strokes like to be at the high end of the recommended range. If the throttle linkage isn't adjusted correctly and there's more to be had, go for it.

BassinFever · 02-25-2008, 04:07 PM

Especially with todays gas you want to shoot for the top end of the Recommended RPM range. Cylinder head temp will be hotter and engine life will be shorter if you lug it.

MattPark · 02-25-2008, 09:50 PM

After getting my fuel flow meter installed and connected to the GPS, I've really found this to be true. I always assumed it was the most efficient just on plane in the 25mph range (36-3800rpm), but bumping it up to 32-35mp (42-4500rpm) barely increases GPH's and increases fuel economy. Next time I have it out I'll take some pics of the display, it really surprised me. These outboards don't really feel "pipey" like a 2 stroke dirtbike or quad, but they definitely have their sweet spot.

DidIPutThePlugIn · 02-25-2008, 10:26 PM

Quote:

Originally Posted by MattPark

After getting my fuel flow meter installed and connected to the GPS, I've really found this to be true. I always assumed it was the most efficient just on plane in the 25mph range (36-3800rpm), but bumping it up to 32-35mp (42-4500rpm) barely increases GPH's and increases fuel economy. Next time I have it out I'll take some pics of the display, it really surprised me. These outboards don't really feel "pipey" like a dirtbike, but they definitely have their sweet spot.

Once on step I usually run about 4,400 to 4,600. Depending on the water it just sounds and feels right in that range.

BassinFever · 02-26-2008, 09:09 AM

I think that if you did a pole that you would find the "sweet spot" on most outboards to be within that range. I know that every one that I have had was.