100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

[boater1234]

Hey guys i need a little help on this one as i know it's half and half with this question.Here is my question.I will be doing like 50/50 trolling and wide open on the motor and i know most yamahas have been 100:1 for a while but alot of people like to do a 50:1 mix just for that extra protection.Well my thing is what will give me the best overall performance as far as the motor running wide open or it doesn't matter?What i mean will a 50:1 mix knock the top performance that the motor should have when i'm going wide open or you won't really loose anything at all.Will it run smoother and faster with less oil?I just want the best overall performance for the motor.

I'm sure 100:1 will not hurt it but i hear alot of people say that they feel 50:1 is mandatory to them no matter what modern day motor they use.Unless it's oil injected.I just want the motor to idle good and have the best overall top speed i can get with the right amount of oil.Should i maybe hit a happy medium with 75:1 this way there is more then enough oil and it will not lack on oil so it won't burn it up.Or should i just do the 100:1 or 50:1.I know when you add more oil it will idle rougher but will it be a big difference in the overall performance.I don't want having to much oil hindering the performance of the motor but at the same time i want there to be the right amount of lubrication in the motor.Also i have noticed this motor has 2carbs and most of the other newer 25's have one.what will this do for the motor?Any help would be great thanks.

I figure while anyone reads this i can add there is a little bit of surface rust on some of the bolts on the powerhead.What is the best chemical i can use to get all that surface rust off the bolts witout hurting aluminum as it is being a pain in the butt to get off?

 

[robert graham]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

50:1 is what you should run. A fine wire brush will remove surface rust, then just a bit of touch up paint. Advanced Auto has a can of spray paint called Metallic Grey/Blue, or something like that, and it's a close match for the Yamaha color. Take a part off your motor to match it up. For very small spots to touch up just spray paint onto a Q-Tip and use that to apply it..works like a charm! Good Luck!

 

[JimS123]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

I don't know what's "right", so I can only relay my experiences. I have the same motor, though a 2007 model. It has 2 carbs.

I followed the instructions in the owner's manual to the letter for initial break in. I have never been happy with the motor - particularly the cold starting. When I had about 20 hours on it I posted a question on the Yamaha forum about it and nobody could help me in that regard. But in the process of talking about it the Yami guru over there said I'd be stupid to run 100:1, because the motor will eventually fail. So, based on that advise I switched to 50:1. I troll too and that little SOB just smoked too much so I compromised and switched to 75:1. Still smoked too much to suit me.

Last year I made one last attempt to get it to start better and took it to my local marina, who's a master Yami Tech and has had their franchise since they came into the US. He said absolutely not, don't use anything but 100:1.

Sooooo, I've been running 100:1 for about the last 40 hours. Still smokes like a SOB, but at least it idles smoother and trolls better now. BTW, I use ring free as well, just like the owner's manual recommends.

(Moot point - I already have the order in for an E-tec. The Yami will be on CL when the weather breaks)

Apply Rustoleum rust reformer with a small artist's brush and the rust will be gone for 20 years or so. It'll be black but the 2-tone effect will look fine.

 

[richardgreen]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

I have the same motor as you and have also pondered the oil mix ratio question.

Shortly after purchasing mine new I inquired with two very reputable Yami dealers in my area and both recommended running 100:1. One specifically advised not to run 50:1. Based on those comments I've been using 100:1 for the last five years. I've put lots of hours on that motor, the majority of which running at WOT. It has performed great since new and continues to run without missing a beat. I'm careful to always use Yami oil and ethanol-free gas. During the boating season the motor is used weekly and I always fog it before winter storage.

Near as I can tell the 100:1 mix has been fine. I'm not a mechanic and can only report the above as my personal experience. Like you I'd be curious if anyone has any firsthand experience SPECIFICALLY with this brand of motor that runs counter to using 100:1.

RG

 

[58rude]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

Could pull a transfer port cover and have a peak at the pistons. The one running 50:1 prob. needs a decarb and good cleanup to stop smoking so much.

 

[boater1234]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

jims123 i know you have helped me in the past here with paint so i'm gonna give you a small tip on oil for 2strokes.I have that 15hp merc that i painted and i know that runs 50:1 so there is no question but here is a good tip for you on the smoke.

I will say this till i die and people can belive me or not but try this for me and tell me how it works.when i got this merc it was brand new as it still is with no more then an hr on it and the gas and oil was in it when i bought it and it smoked so bad you would choke to death.So like i always do i went and got a brand new gas tank[6gallon]filled it with non ethanol gas or you can use ethanol no difference and i put 100%pennzoil synthetic oil in it and man almost no smoke comes out of the exhaust if any.It trolls like a dream and you will never get one drop of carbon buildup so you don't need to use ring free from yamaha.Also biodegrabable which is nice.

Now remind you i'm breaking in this motor at 25:1 so thats 32 ounces of oil for a 6g tank and no smoke.So i bet if you ran 100:1 on the yamaha you will see a huge improvment as far as smoke and no carbon buildup.Walmart sells it for $28 a gallon.Best investment i have ever made.I just picked up a 2007 carolina skiff,a 2008 25hp yamaha 2stroke and a nice trailer for $2500 which is highway robbery.The motor is like new with only 9hrs.The compression was 124 and 123 on both cylinders.He had that 2stroke johnson oil from walmart in it and it smoked like no tomorrow and i am going to relube the whole inside of the motor since it sat for a while with 50:1 in with one full 6g tank.I will prob just run it on like 75:1 just to be safe.I have put new oil and gas in it and it runs 1000%better at idle and no smoke whatsoever with the pennzoil full synthetic.

It's just a fact synthetic is a better oil and almost all the major motor companies are finally seeing this thats why they are all coming out with their own line of 2 and 4stroke synthetics.Jim it works trust me on that.I also use a water/fuel seperator on every boat i own.I really like yamaha's filters they are made extremly well.


Every boat i have owned i use a stabilizer called sentry[it is the best you can find and that is facts no opinion]go to sentrytreatments.com and read on it you will be amazed,plus i use a water/fuel seperator,full synthetic oil,and non ethanol gas and have never had a problem with any motor i have ever owned even if it sat for months.That sentry is just unreal what it does.I have tried every stabilizer before i used it and there is just no comparison.It does what it says unlike most stabilizers.Well i guess i will go 50:1 to break her in and then either 75 or 100:1 as i think about it for a while.Thanks for the info guys.

 

[JimS123]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

Pardon me for venting..I just hate that motor so much. The smoke is really not an issue as long as it trolls and runs OK. My 1953 Evinrude runs on 24:1 and although it smokes much worse its not bothersome. After growing up with 1950's outboards I just love the smell of a 2-stroke....LOL.

My reason for writing was to reply to your question. My point was that you should follow the book, not internet suggestions that say otherwise. If my Yami needs cleaning because of 50:1 its my fault because of a momentary lapse in judgement. In any event, my starting issues are not oil related.

 

[Cannondale]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

Every boat i have owned i use a stabilizer called sentry[it is the best you can find and that is facts no opinion]go to sentrytreatments.com and read on it you will be amazed,

Frankly, I wasn't amazed by what amounts to another IPA product. Nice sales pitch on their site, though.

 

[58rude]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

Should be able too make that little motor fire pretty easy, just need to learn what it likes when its cold. Have you tried about a 1/4 throttle and not hitting choke till its cranking. You say your selling it, so I guess it really doesn't matter, but it would be nice to be able to fire it up till then.

 

[pecheux]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

IMO using the Yamaha recommended oil for a 100:1 mix is a key factor.

 

[boater1234]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

Frankly, I wasn't amazed by what amounts to another IPA product. Nice sales pitch on their site, though.

Have you tried it?Remember it's not a wonder chemical as some motors are to far gone before you use that or any stuff we think will work.I have never heard a bad thing about it yet.What made me a beliver was i bought a new 70hp 2stroke yamaha with 3carbs and let it sit for 4mths with ethanol gas in it.Needless to say what a bad move on my part,plus i had the new marine blue stabil in that is suppose to last 2yrs.

So i brought it down to the marina and it was going to be $150 a carb to clean them out.They said they got a new product in called sentry[please keep in mind this was 3yrs ago],it was $24 a bottle and swore by it.[TRUE STORY NO B.S]The guy said at the marina if this stuff didn't clean my whole fuel system out he would clean my carbs for free,thats alot of confidence to me.I bought a bottle and did a double dose in my motor and ran the crap out of it for 2 days and no response as it was still running rough,stalling and hesitating bad.So he said try one more bottle on them,so i tried once more and i will tell ya there is no reason for me to lie to anyone on this as my motor after the second bottle was unreal.It idled better then the day i bought it,It never missed a beat after that second bottle and it saved me a $450 carb job.Now keep in mind my carbs were probally not as bad as someones who has sat for yrs and yrs so the chances of anything working is slim.After a $24 bottle and one on them i am a beliver in this stuff and have used it ever since for almost 4yrs with awesome results.I ran 2 bottles and ran my boat full throttle most of the time for 3 days to clean the system out and it worked as advertised.

Everyones entitled to their opinions about eveything,i'm just stating my full experience with it.I know about 100 boaters here in fl and not a one of them fills their gas tanks without this stuff[non ethanol or ethanol gas it doesn't matter they all use it.If you buy a newer motor and use this stuff rite off the bat starting with tank one i bet no one will ever have a fuel problem as long as they use their boat at least once or twice a mth.I don't sell the stuff but i buy 5gallon pales at a time of it and it last me a long time for the money i pay.Ok just trying to help everyone.

 

[boater1234]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

Well i guess if yamaha says use a 100:1 ratio it has to be ok as they would not want all their motors coming back for a warranty claim.So i will do that after a good rebreakin of the motor at 50:1 as i don't know how it was broke in before i got it,then i will run at 100:1.The guy said the original owner only put 6hrs on it.I also found out it was purchased in 08 from the marina so it is actually a 08 motor.Can't wait to get this baby on the water.

 

[JimS123]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

Should be able too make that little motor fire pretty easy, just need to learn what it likes when its cold. Have you tried about a 1/4 throttle and not hitting choke till its cranking. You say your selling it, so I guess it really doesn't matter, but it would be nice to be able to fire it up till then.

It doesn't like ME....that's the problem. It matters to me because when a perspective customer looks at it ands asks why I'm selling it I won't lie.

* If the motor has sat a week or more, takes 9 pulls to start
* 1/4 throttle, no throttle, full throttle, makes no difference
* full choke or half choke - takes 9 pulls
* no choke and it won't start at all
* If on vacation and being used daily (in other words it has only sat over night) starts first pull with the choke on full and the throttle at the start position
* If I pull the gas line off and let it run out till it dies, then the next time I start it (a week later and after reconnecting the line and priming the bulb till hard) now it only takes 5 pulls to start
* Two gas tanks, bulbs and fuel lines - old and new - both act the same
* When hot starts first pull every time
* Once its running it runs perfect - uses on avg 1 1/4 gal per hour
* Whenever it is started, whether hot or cold, it billows blue smoke for the first 15 seconds
* Spark plugs look perfect - same as all my other 2-strokes

 

[mrcrabs]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

I have a friend who runs a super tuned 140 J/E looper w/yamaha ignition and flywheel( merc killer)...he runs klotz's best synth. oil and he breaks them in a 20:1, then use's 50:1 he builds them his self and does all of his own porting and design. I think he has a website www.madmanengineering.com
I run J/E XP 25 oil in my old 70 hp looper and penzoil synth when I can get it cheap, I get less smoke and carbon from the penzoil but performance is always down a bit by a few rpm??? could be the air density on those days...I like the synth in my little Tecumseh based Eska...you can really see the diffrence in the test tank water between J/E XP 25 and the penz. and when you tear them down theres no smudgy carbon.
I get to look over his piston and rings after a season of bipolar boating and WOW! you never saw such a clean cabonless piston and rings, when he used the cheaper klotz he would get stuck rings... he turns 7000 rpm or better, I bet my old looper even with seafoam with every other tank looks like hell inside compared, I also decarb with OMC tuner once a year...but she's doing pertty good for 35 years of yearly service.

The one thing I see wrong at the dock with people starting there outboards is people don't like to squeeze the primer ball...so they crank and crank...I always ask did you prime it?....they say don't worry she will start here in a minute...its cold blooded, crank crank crank...I say its fueless


http://www.klotzlube.com/products.asp?cat=6

 

[pscrabber59]

Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke

Jims, sounds like you have a lemon(9pulls to start?) and smokes like my fireplace with the damper closed LOL. Do you have a warrenty with it? If not then put it on CL and get rid of it i'm sure somebody will take a shot at it for the right price!! Gd luck sellin it