fuel mix in 30hp 2stroke yamma

[thehairynurse]

does anyone know? mate whose boat it is cant remember, the oil mix container says 100:1 but my mate thought it was more like 30 or 50. just put some fuel in so need to know soon to put in the oil

[quintrex101]

whats it said on the motor, on my motor ( which is the same 30 hp 2 stoke yamaha ) it said to use 100:1 but wen we brought it the bloke we brought it of said to use 50:1, we tryed that, it was smokey,richer, and slower, and sounded like it needed to be tuned, today we tryed 70:1 and it was alot better, hardy any smoke, and it looked like it was going faster, in other words it was better,

on there website it said

Yamaha’s 100:1 Gas/Oil Premix Ratio on portable ( which is up to 25 hp, there is no 30hp on there, dunno why ???? ) models dramatically reduces smoke, odor, fumes and plug fouling. It protects your engine and cuts your oil expense in half.

hope this helps

[thehairynurse]

heaps mate, cheers, the first fish i catch will be for you, followed by the first beer:pottytrain1:

[nimrod]

Excuse my ignorance but don't they have oil injection where you fill a seperate bottle with oil, and it mixed itself ?.
Or do you have to add oil to the petrol itself ?.
I mainly play with older motors:banghead: .
Frank

[thehairynurse]

you add the oil to the petrol in the tank and mother yamaha does the rest, just like father victa in the backyard, you just need to know how much fuel you put in so you know how much oil. quinnie was spot on with his ratio, it ran like a dream today.

[Dog Catcher]

Hairy I'm @ a loss & lean towards what nimrod said

Unless your motor is a CV or you've chosen to by pass the oil injection

I had never heard of the 25 : 1 ratio B4 then again I've never owned a motor the size you are refering to

[thehairynurse]

think it may b a cv model, dont know really as its my mates boat and he used to add oil to the tank or buy 2stroke from como marina

[Bass flicker]

I own a 25 hp Yamaha and use 70 : 1 the specified ratio is 100 : 1 but I find that it revs its tits off and pings a bit. 50:1 is way to rich and as Quinnie said it smokes and runs poorly. Make sure you use Yamalube oil from your marine shop. Any othe questions just pm me its seems we have pretty similar engines!

I know Im just repeating stated facts but it might help in building your confidence a little :ohhh yeah:

[thehairynurse]

bass flicker, with a few scotches on board, i dont need any more confidence, i could be dangerous. attractive even. :scull:
p.s i got the yamma mix, and in the next few months im might make it to the spots you p.m me on the hawk hawk

[Dog Catcher]

Well Well Well !

You learn something everyday 100 : 1 hey ??

Just out of curiosity do any of you guys with these 100 : 1 motors have tacho's on your boats ???

If so I'm very curious what the motors rev out to ???????????

Unlike a 4 banger 2 strokes rely on the oil to lubricate moving parts & I know with the oil injected 2 strokes oil is mixed to the fuel according to revs the motor is doing.

If motor is reving @ max then more oil is injected in & if you're idling the the ratio drops cause motor isn't working anywhere near as hard.

I was a smart arse many many years ago when I had a 80 hp merc the bastard of a thing would foul plugs coninually when I trolled livies @ around 1000 rpm & would have to change plugs out @ sea.

A brain explosion saw me mix oil @ 100 : 1 in one of the tanks just to troll with but sometimes I'd 4get to swap tanks on way home & did blow that motor one time because I'd 4gotten to swap the tanks.

[thehairynurse]

dog catcher i have a very sophisticated tacho onboard which tells me that at 1000rpm it goes wwwhhhaaaa and at 3500rpm it goes WWWHHHAAA

[Boiler]

OK i have a couple of questions (sorry to steal your thread)

I have a yammie 115 2st CV, now

1. I run 50:1 & it seems to be smokey?

2. I use quicksilver oil, is this ok?

Pls be gentle as i am not very mechanically minded

[quintrex101]

not to sure about a cv, you can useany oil and oil mix 70:1 for a few go and then go to 100:1

[Boiler]

Another question, sorry

Is it ok just to change straight to Yamalube from quicksilver?

[thehairynurse]

i would finish the current tank first and next time you fill up ad the yammalube, no mechanical theory or knowledge behind me but at least that way you will know straight away if the oil makes a difference, but then it may take a few tanks with the new oil to get better mileage if you do get better mileage. just make sure your not out at sea when you need to fill up:jumping red:

[Dog Catcher]

Boiler !

Dont be fooled that Yamaha or Quicksilver make their own oils because they dont end of story.

They contract out someone like Caltex or Valvaline to make the oil & those Co's also package the oil for the likes of Yamaha.

In turn Yamaha but a nice little mark up $$ on the product which you as the end user pay for.

I have a 50 hp CV & still have my twin 85 hp CV's I repowered to 4 bangers not that long ago & haven't gotten rid of them yet.

I've always used Valvaline in my mix & mix @ 50 : 1 reason I buy CV's is because I dont like oil injection.

Now getting back to your Q

1. I run 50:1 & it seems to be smokey?

It's a bloody 2 stroke of course it's gonna smoke up esp @ idle & thats where you notice, next time you're out have a look @ your exhaust when you're got the revs up.

Bet you wont notice any or very little smoke.

If you go back to my previos reply you'll see where I said @ idle or low revs your motor does not require as much oil cause it's not reving out.

Prob is if you drop the ratio then you will blow up your donk have no fear of that.

I asked the Q about how high these smaller motors rev out @ cause I was only trying to put logic as to why a 100 : 1 mix is recomended thats all

[Bass flicker]

Well Well Well !

You learn something everyday 100 : 1 hey ??

Just out of curiosity do any of you guys with these 100 : 1 motors have tacho's on your boats ???

If so I'm very curious what the motors rev out to ???????????

Unlike a 4 banger 2 strokes rely on the oil to lubricate moving parts & I know with the oil injected 2 strokes oil is mixed to the fuel according to revs the motor is doing.

If motor is reving @ max then more oil is injected in & if you're idling the the ratio drops cause motor isn't working anywhere near as hard.

I was a smart arse many many years ago when I had a 80 hp merc the bastard of a thing would foul plugs coninually when I trolled livies @ around 1000 rpm & would have to change plugs out @ sea.

A brain explosion saw me mix oil @ 100 : 1 in one of the tanks just to troll with but sometimes I'd 4get to swap tanks on way home & did blow that motor one time because I'd 4gotten to swap the tanks.

Tacho?? how many tinny's do you see with a tacho?? I have to pre mix my fuel. This means that the mixture pre dictates the engines performance for the day!

The motor does not rev out to any extreme level, though it is noticable to the ear and feel on the tiller.

[storms72]

Dog.....Just a quick one...I worked for a Yamaha outlet a few years ago and after meeting and chatting with a few of the guys from Japan mainly talking bout Jet Ski's we were racing for them at the time they did say the Yama 2 stroke oil-(tcw3) was recommended because it was produced and manufactured by them to much higher and stricter standards than other brands on the market! The ski's we raced were GP1200's putting out round 180hp and capable of over 150km on lightly rippled water-yeah its pretty quick but they were seriously worked with all yama go fast bits- 1 was stroked and was clocked at over 180km, we only ever used yama oil as recommended. Other guys who raced used other brands and did report having trouble-wether this was due to the work done on the engines, the high temp they ran at or the oil is not confirmed, can only say the reliability of the ski's using yama lube was in our experience much better.......I'm only letting you know what I was advised and experienced....

Possibly yama oils may be bottled in OZ by other oil manufacturers but may not be the same oil used by Valviline, Shell, Quicksilver etc!

Would be interested in knowing the facts...is it the same oil or is it possibly better grade????????

Jason

[Boiler]

DC,

Thanks for that mate.

I just wanna make sure its "ok" to have the smoke & that 50:1 is right to run.

[storms72]

Roy, additional oil shouldn't pose a problem so long as you are using your boat on a regular basis, as DC said it will blow a little more smoke thats about all....If its going to be sitting for a while(2months +) check the yamaha site on tips for winter storage. Only from advice I was given I would recommend using Yama 2cw3 but it's up to you what oil you choose to use!

Quinnie, your motor has oil injection....why do you pre-mix???????

Hairy....Depending on the year your Yama was made it seems Yamaha changed the fuel mix from 100:1 to 50:1 on all non oil injected models made in the 80's.....1 US site recommended a 60-80:1 mix to prevent plug fouling and reduce smoky exhaust! On ya Quinnie.....

[Dog Catcher]

Dog.....Just a quick one...I worked for a Yamaha outlet a few years ago and after meeting and chatting with a few of the guys from Japan

Do you honestly think Yamaha have their own oil refinery even a wee small one ??????????

Or do you think what you were told was mere saleman talk ???????

Mate for starters I would not own an outboard unless it was a Yammy thats how highly I regard them.

Yamaha have building outboards long B4 they hit the Australian market they used to build the Mariner range for Mercury up to the 80 hp model & part of the contract was they were not allowed to sell the Yamaha name in Oz or the USA.

Getting back to your Q I haven't had a look @ a yamaha container to see what it says but if it is that much better than your standard 2 stroke oils then a good guess tells me it's a semi synthetic oil & again I'll bet my short & curlies it's made by one of the larger oil company's on behalf of Yamaha & you can get the exact oil marketed under another name for a cheaper price.

If you guys do want to run a supirior oil then I definately recomend a semi synthetic one.

I had my 85 hp CV's for about 12 years & ran plain valvoline 2 stroke oil through them & those motors never once gave me a spot of trouble.


Yeah Boiler

50 :1 is what I ran mine @ & thats what the specs said to do

[Dog Catcher]

Hairy....Depending on the year your Yama was made it seems Yamaha changed the fuel mix from 100:1 to 50:1 on all non oil injected models made in the 80's.....1 US site recommended a 60-80:1 mix to prevent plug fouling and reduce smoky exhaust! On ya Quinnie.....

Just had a thought & prob nothing but if I'm not mistaken [ bear in mind I've never used one]

Dosen't a lawn mower use 100 : 1 ??????????????????????

And it is a differ 2 stroke oil I know that for a fact cause I always read labels & once picked up a bottle & just as well as I read it cause it said not recomended for outboards.

Next time I go visit my mate {out board dude] I'll bring up the topic of the 100 : 1 in the smaller outboards & see what he has to say like I said I'm very curious esp when many years ago when I did have outboards around 25 hp I recall the mix was 50 :1 on them

[storms72]

Hey, you'r probably right DC.....But there are crap oils out there and better grades...It is possible Yamaha only get the best they contract a manufacturer to supply to them, hence the higher retail price and better protection claimed! It might just come down to how well the oil is filtered or additives added to improve the performance and protection the oil offers.

I never mentioned anything bout Yamaha owning a refinery, maybe just another very profitable venture they're involved in??? who knows they could easily afford it from the profits coming in from their many products in the world market-eg: Marine products, Motor bikes, Instruments, Hi-Fi.

As far as semi synthetic goes I would have a good look into it first, and talk to a reputable marine mechanic or outlet.....I am not currently aware of a semi synthetic 2 stroke oil available nor recommended for use with 2 stroke outboards, can anyone say they have used it in a 2 stroke outboard???. Synthetic technology has been proven to be good for 4 stroke engines, I won't use anything but Penrite Full synthetic oil in my family's cars as it proved itself in my old Stato-tried many brands(Shell, Mobil, Valvoline, repsol) but the penrite was the only one that kept the pressure up and temp lower over all driving conditions, had to add a stabiliser to others to get the same results. This proved to me that all oils aren't the same. I'm only commenting on my experience with the products mentioned above.

Jason

[quintrex101]

[quote=storms72]

Quinnie, your motor has oil injection....why do you pre-mix???????

quote]

it does't, i never really mined, i think it is better to pre-mix and it allready mixed, but if you got oil injection and it stuffs up and lets no oil throught you are in trouble because there be no oil getting to the motor :_smack_:



cheers,

:beerchug:

[Dog Catcher]

OK had a yarn about the 100 : 1 ratio today with Boofaleeny.

Here's the story I got told.

About 5 years ago Yamaha introduced their low emmision motors hence the 100 : 1 ratio.

Now this is what I find interesting & was curious about the pre low emmision motors are exactly the same as the newer low emmision a few reply's back I asked if anyone had a tacho fitted to theier boats & that Hairy guy [ Cousin It] made some funny noises with his mouth guess he does the same thing when making expresso coffee :banghead:

Anyway not knowing reason I asked was cause I didn't know if the newr motos reved out alot lower than the older ones & apparantly THEY DO NOT !

As stated exactly the same motors.

Now in my view & that of my mechanic mate's I would recomend running 50 : 1 mix in those new motors Yamaha may know betterBUT

They've already sold you the motor & warrantee dosen't last 4 ever

Esp in the case of that Hairy fellow who's motor goes WWWHHHAAA

Unless ewes drive your boats like old farts maxing out @ 1/2 revs I'd be using a 50 : 1 mix & say up yours Yamaha !

Much cheaper to replace spark plugs than to overhaul a motor.

Now getting back to that yammylube crap ??

It's not a semi synthetic oil like I 1st thought it may have been it's just plain old 2 stroke oil & I'd be buggered if I would pay the extra cost cause yamaha said it was special.

What a load of CRAP !

Bear in mind I wouldn't own a motor if it wasn't a Yamaha but that dosen't mean I fall for all the marketing they throw @ their customers.

[storms72]

Quinnie...what are you thinking, do you think Yamaha put oil injection there for fun, its been around since the late 80's, I think they would've sorted any issues out with it by the time your engine was made...

so long as you get your engine serviced at sensible intervals use the oil injection....

At the end of the day its up to you what way you decide to mix oil into your fuel but mate why would you fiddle around with pre-mix when injection is a far better way to lubricate your engine!

[Dog Catcher]

At the end of the day its up to you what way you decide to mix oil into your fuel but mate why would you fiddle around with pre-mix when injection is a far better way to lubricate your engine!

Very simple answer to that theory !

When you pre mix you know the oil is in the fuel

With oil injection alot more things can go wrong here's some of them

I know of 2 peeps who have had malfunctions with their oil Reservoir & had to replace them it was classed as plastic contamination & I kid you not on that one.

OK you've fuelled up your tanks & didn't check oil Reservoir no good having all that fuel if you've got no oil.

When I did have oil injected motors a mistake I only made once alarms were going off left right & centre & since I didn't carry owners manual on board I had no idea that they were the oil injection alarm.

In short call it old fashioned but if you pre mix you illiminate possible failures & dont come back with modern technogy is much better these days cause even with modern technology you have more possibilities of things going wrong.

[storms72]

Your point of view is appreciated and acknowledged DC but just a little advice to others who are reading this thread and have outboards with oil injection wether they be Yamaha or other brands....Use it, it was put there for a reason, if your alarm sounds it is usually caused by low oil so if your alarm starts buzzing first thing to check is oil level!

Get in the habit of checking oil levels every time you hook the boat onto the trailer to go fishing guys...

DC wow, 2 of your mates have had failure of their oil injection....How many others have had no problems, how many thousands of outboards with oil injection are sold each year and I expect very few fail because of oil injection issues except for those owners that are too cheap or too ignorant to get their engine serviced by a good qualified mechanic...

3 years of working in a Yamaha Outlet and no failures caused by oil injection in all motors we serviced-and yes we worked on more than just Yamaha,.....Again it comes down to sensible service intervals for your engine.

Jason

[Dog Catcher]

DC wow, 2 of your mates have had failure of their oil injection....

I didn'y pay that much attention & for the record the motors were Mercury's not Yamaha's.

All I recall was that new oil tanks had to be fitted now whether these were just 2 isolated incidents I dont know but the term container contamination was used.

I also know of a hell of alot of people who purchased oil injected motors & had the injection system disabled only to go back to mixing their own

Guess they tried & didn't like oil injection

[quintrex101]

i think in the end it comes down to what you like i gues , if you are a fan of the oil injection motor thats not a problem but some people just like mixing there own oil into the fuel for knowing that the oil is if the fuel,

personal pick i guess