Question about my motor when I ran out of gas today

[Michael leblanc]

I went run my 1979 mariner 25 today ran awesome on the way back to landing I ran out of gas but right before I ran out my Rpms went up and I picked up speed for a good minute r two can any explain

 

[GA_Boater]

Re: Question about my motor when I ran out of gas today

When it started sucking air, the mixture leaned out. Are your sure it ran a minute or two? That's a long time and lean running that long means there was less oil in the fuel for lubrication.

 

[wired247]

Re: Question about my motor when I ran out of gas today

They always run great lean just before they pop.

 

[Michael leblanc]

Re: Question about my motor when I ran out of gas today

Yeah prolly not that long ....but y don't It run that fast all the time u think it can be a float issue r seat

 

[Michael leblanc]

Re: Question about my motor when I ran out of gas today

U think if I drop on my pitch it would pick up a lil more speed

 

[Mi duckdown]

Re: Question about my motor when I ran out of gas today

It's 25 hp Don't spend money. is your prop in good condition? And since you don't mention what boat you have. Tiller/ console. Who knows?

 

[MH Hawker]

Re: Question about my motor when I ran out of gas today

Yes you can but if its has the right pitch on it now it can blow up the motor, what WOT rpm is it now.

 

[gm280]

Re: Question about my motor when I ran out of gas today

Most all 2-cycle engines pick up RPMs when running lean. But there is a price to pay for that lean run too. It is called extra heat and little lubrication to all the internal bearings causing sever wear. So you can lean it out (install smaller main jets) but you will be rebuilding or replacing that engine real soon if you do. I use to fly R/C aircraft and literally wore out many engines peaking them pass their limits before I understood that concept. I was only getting around twenty or so flights and the engines were gone. Once I backed off the lean peak rpms, the engines lasted as long as I wanted to fly... Expensive lLesson learned the hard way! :facepalm:

 

[midcarolina]

Re: Question about my motor when I ran out of gas today

When we used to race 2 stroke motorcycles there was a sayin.........lean is mean.... 2 strokes have two different lean conditions....
restricted fuel delivery ( not fast ) reduced amount of premix ( fast but short lived )

 

[Michael leblanc]

Re: Question about my motor when I ran out of gas today

I got a allweld 14ft flat with a stainless 11 pitch my older brother has same boat but 15ft with a Yamaha 25 with a 10 1/2 pitch r 10 I'm not sure witch one it is and his boat is faster then mine

 

[Michael leblanc]

Re: Question about my motor when I ran out of gas today

How can u read rpms while u running it

 

[midcarolina]

Re: Question about my motor when I ran out of gas today

get a inductive tach....

 

[wired247]

Re: Question about my motor when I ran out of gas today

How can u read rpms while u running it

Here you go. $13 and they are spot on for RPM.

http://www.ebay.com/itm/331086473062?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

 

[Michael leblanc]

Re: Question about my motor when I ran out of gas today

Cool I'm order it what the top rpm it should run

 

[MH Hawker]

Re: Question about my motor when I ran out of gas today

Here you go. $13 and they are spot on for RPM.

New Hour Meter Tachometer Small Engine Spark for Motorcycle Boat Bike US Stock | eBay

I bought that exact one 2 years ago before I added a tach to the console it worked fine when I was dialing in mine.

 

[wired247]

Re: Question about my motor when I ran out of gas today

Works nice as an hour meter too.

 

[Michael leblanc]

Re: Question about my motor when I ran out of gas today

What should wot rpm on my motor

 

[wired247]

Re: Question about my motor when I ran out of gas today

Without a manual for one in front of me I'd say 5500 max RPM on one of those.

 

[Michael leblanc]

Re: Question about my motor when I ran out of gas today

K thanks

 

[oldman570]

Re: Question about my motor when I ran out of gas today

If the boat is loaded with 2 people and all needed gear for fishing, then you can go to a 13 pitch without any trouble for the prop. I run that on a 14' StarCraft Mod V hull and can run around 27 when loaded as such. Any more than that dose not work when getting up on plane. I always carry a extra 2 gallons of gas and oil in the boat when I think there is a chance of running out of fuel. It is cheap insurance for not having damage done to the motor from a Lean burn, and getting back to the ramp without a tow or paddling. You need to check the law for your boating area before hand, to make sure it is legal to do so. JMO
Oldman570