Peewee 50 Concern

[Timbo_hx55]

Hello to all, I have recently purchased my son a peewee 50. I was advised to premix the fuel/oil as to avoid any possible failures resulting from the factory oil injection unit. Yamaha insist there is no published fuel/oil ratio specifications as the bikes come (as I said before) with a factory oil injection unit. Can anyone tell me what would be an ideal ratio to mix the oil & fuel. Cheers.:driving:

[spank]

i would have thought 25:1, but not 100%sure , what does the dealer you bought off recommend, have peewee 50's always had oil injection what mix did previous without oil injection run

[maloo_]

Had few PW50's and never had a problem with oil injection unit. But 25:1 should be about right.

[seldo]

If it's brand-new, why the heck wouldn't you use the factory oil-mix unit? Why make problems for yourself?

[EXCESSV]

as seldo says...its brand new so use the oil mix unit.
heck it should even have some warranty on the whole bike anyway

[Timbo_hx55]

If it's brand-new, why the heck wouldn't you use the factory oil-mix unit? Why make problems for yourself?
I have heard several stories about the oil injection units gumming up, blocking up, malfuctioning, shitting themselves, call it what you want, but the idea of pre-mixing your fuel is just too easy & avoids a F#*ked engine if it does fail. I used to own an RZ350 Yamaha, also factory oil injected, you should have seen the mess it made when the oil injection failed - not very pretty & cost me an arm & a leg to have repaired.


as seldo says...its brand new so use the oil mix unit.
heck it should even have some warranty on the whole bike anyway
I didn't say anything about new, it has done approx 7 Hrs. Hence no factory warranty, thanks anyway.

[Toddler78]

I wouldnt add any oil to the fuel, all you are going to do is clog up the spark plug and make the thing a b1tch to start when cold. most of the time the manufacturer set the oil injection rate higher then what is needed. When I was racing it was pretty common place to retard the oil injection to produce more horsepower and acceration, very seldomly had problems (ie 15 -20 bikes runing practice, qualifying and three races for 5 meets) maybe total of 4 bikes failed, cracked piston. then just a case of pull engine down put new piston in and go racing again.:thumbsup:

[Tre-Cool]

Going back some 15+ years ago when i raced them. my old man got rid of the oil injection simply because it was easier to just use the same fuel as our other bikes which were pre-mixed with oil.

I don't think we ever had a problem with the stock system, just easier to use pre-mixed fuel.

[Timbo_hx55]

I wouldnt add any oil to the fuel, all you are going to do is clog up the spark plug and make the thing a b1tch to start when cold. most of the time the manufacturer set the oil injection rate higher then what is needed. When I was racing it was pretty common place to retard the oil injection to produce more horsepower and acceration, very seldomly had problems (ie 15 -20 bikes runing practice, qualifying and three races for 5 meets) maybe total of 4 bikes failed, cracked piston. then just a case of pull engine down put new piston in and go racing again.:thumbsup:
Thanks for your reply, I was thinking of not using the factory oiler & just adding oil to the fuel only. I don't think this will have any affect on the spark plug, most other bikes, eg. CR's, KX's YZ's RM's etc all use oil added directly to the fuel.

[Avalanche]

Just talked to the bro , who has his own bike service shop in Queanbeyan. He said use the factory setup as it works well. But, use oil that is meant for oil injection setups, they are different to premix oils. If you use premix oil in the injection setup it is too thick & will clog it up. Use a good synthectic oil that states its for oil injection & you wont have any probs. If you want to pre mix, he said again use a good synthetic & mix it at 32:1. Also alot of the pee wee 50 & 80s run a very rich jet as well, so running 32:1 wont clog the shite out of everything. Pm me if you need any more info.

[[J]]

Just talked to the bro , who has his own bike service shop in Queanbeyan. He said use the factory setup as it works well. But, use oil that is meant for oil injection setups, they are different to premix oils. If you use premix oil in the injection setup it is too thick & will clog it up. Use a good synthectic oil that states its for oil injection & you wont have any probs. If you want to pre mix, he said again use a good synthetic & mix it at 32:1. Also alot of the pee wee 50 & 80s run a very rich jet as well, so running 32:1 wont clog the shite out of everything. Pm me if you need any more info.

Now thats solid advice right there!

Thats why this forum rocks :thumbsup:

Sparky

[Timbo_hx55]

Just talked to the bro , who has his own bike service shop in Queanbeyan. He said use the factory setup as it works well. But, use oil that is meant for oil injection setups, they are different to premix oils. If you use premix oil in the injection setup it is too thick & will clog it up. Use a good synthectic oil that states its for oil injection & you wont have any probs. If you want to pre mix, he said again use a good synthetic & mix it at 32:1. Also alot of the pee wee 50 & 80s run a very rich jet as well, so running 32:1 wont clog the shite out of everything. Pm me if you need any more info.
Avalanche, Thank you very much, that is exactly the advise I was after, Cheers.

[VX2VESS]

Just talked to the bro , who has his own bike service shop in Queanbeyan. He said use the factory setup as it works well. But, use oil that is meant for oil injection setups, they are different to premix oils. If you use premix oil in the injection setup it is too thick & will clog it up. Use a good synthectic oil that states its for oil injection & you wont have any probs. If you want to pre mix, he said again use a good synthetic & mix it at 32:1. Also alot of the pee wee 50 & 80s run a very rich jet as well, so running 32:1 wont clog the shite out of everything. Pm me if you need any more info.

yep good advise, is a pain doing pre mixes. but keep an eye on the injection setup, don't let it run out, it lasts quite a while, but keep checking it after each ride as a habit, pretty sure pree wees have no warning light when low. they have no dash.

they do have problems with water and electricals however. i recall all the kids on pee wees at the club used to stop after going through big puddles, but the other bikes kept going like Suzuki 80's.

you can get that yellow coloured battery terminal spray in a spray can, its like a plastic rubbery stuff that sets hard. thats good to seal up electrical stuff on dirt bikes, i used to use it.

[turbo6]

Clog up the spark plug?? WTF? It's a two stroke designed to run oil in the fuel to lubricate the cylinder.........

Mate, go and grab yourself some top shelf Motul synthetic oil for premix and mix at 50:1 as recommended on the bottle. I used to race A Grade motocross (back when they were all two strokes in '91-'92) and never had an engine failure with the recommended 50:1 from Motul. I would suggest that a peewee 50 will not be under the same stress. Don't run 32:1, too rich.

[BLACKWAGON]

Why would it clog up the plug when the oil will be in the fuel premixed if not through factory setup?
Same fuel, same oil goin to the same place.
We had pw50 for a few years, ridden nearly everyday and never had 1 problem with factory oil setup.

[vuss383]

If you want to premix the oil & fuel and reduce any problems, as stated above mix at 32:1 ! I personally use Castrol TTR in my kids QR 50 ( bought new back in 1999 by memory ) through the auto system without any hastles to date ! In my bikes ( CR250 , Pocket Bikes ) & my mower I premix at a ratio of 32:1 & even as high as 40:1 with out any long term affects - CR i've owned since 1986 ( 84 model ) and still going strong !

[vycalais5.7]

remember if you are going to use pre-mix fuel, mix it yourself, dont get it from the servo's its always way too rich. and another thing to remember is that 2-stroke fuel will go off(stale), ive seen some mixes go off inside 3 months,
....mick...

[VYR8HSV]

We have had ours for 2 years now.
have only used the oil injection with no probs at all.
Just use a good synthetic oil & all should be good.

If you start to mix your own mix up it might not be
quite spot on with either 2 much or not enough.

With my young boy on it learning, he was not on the throtle
much at all. And as with most 2 strokes it ya dont rev them
then the plug cant clean (burn) the oil off. So the plug just
keeps on fouling up. Then it will be a real pain in the ass to start.

Ours starts every 3rd or 4th kick at the most.

Cheers Pete

[chrism697]

remember if you are going to use pre-mix fuel, mix it yourself, dont get it from the servo's its always way too rich. and another thing to remember is that 2-stroke fuel will go off(stale), ive seen some mixes go off inside 3 months,
....mick...
yeah when i used to race 125's we tried to never use fuel that was more than 2 weeks old, wouldnt be as important in a 50, but still a good idea not to keep pre mix too long