Premixing

[Davey-boi]

Yo dudes, if someone took the time to do a full premix everytime they filled up their gas tank, would it help any? What are the benifits of doin this? And if someone were to continually premix, should they totally overide the oil tank system? Also, if i where to premix, I would be using fully synthetic oil. Thanx.

[XPS1210]

If you premix you know exactly how much oil your getting in your gas... How much does the oil injector kick out? I don't know! and is it consistant?

I do think it would be wise to completely disable the oil injection as if not then your wither pumping extra oil or will have a warning light and an injector (pumping nothing, which is bad) on all the time...

anyone else have thoughts on this?

[Lennox]

The injection is hit or miss. Depending on throttle position is how much/little oil you get. And what if the pump fails, or a line comes off. BOOM!!!

The only preformance benifit is more consistant tuning.

Leave the oil tank with about 1/3 full. Disable the cable, and cap the line. This will take care of the warning light.

[Davey-boi]

I'm thinkin about just adding a lil oil to my gas when I fill it up. I don't wanna disable the injection system though. So how much oil should I put in?

[Lennox]

your gas tank is what? 1.5 gallons?

1 ounce to a full tank will give you 192:1 I think??

2 ounces will yield----------------96:1 might be alittle smokey?

This is about right ONLY IF YOU LEAVE INJECTION SYSTEM ACTIVE!



Davey, why do you think you need to do this? Ussualy when you get to the point (mod wise) of worrying about your mix.... you just scrap it and pre-mix?

[Davey-boi]

Cuz I think I'm running lean. My plug reads greyish with a tiny hint of red-brown. I havn't got a tach yet, so I was just gonna add a lil oil until then. I want my scoot to last a good 7,000 miles (even though I'm gonna stage duece the baby!)

[XPS1210]

then you need to richen the air/fuel mix a 1/8 or less turn...

Not the idle screw but the air/fuel mixture screw... Bring it out 1/8 or so and it will richen the amount of air/fuel entering the cylinder... This will solve the problem....

No need to use a premix if your set up is mostly stock...

[islandscoots]

At 1800 miles on my 2001 vino I seized the engine because the oil injection pump quit because a small check valve in the oil line prior to the pump got plugged up, needless to say I always premix now.

[pdxjim]

Okay, now you guys just made me worry. Anyone else had any problems with the oil pump and siezed engines?

[str8dum]

check valve huh? 2001 must use a totally different pump deisgn. The new models have no valves and i doubt would ever fail, barring the plastic gear on the crank doesnt break.

Most tuners complain of too much oil with an aftermarket motor bc the oil pumped is rev based. When u get higher than stock revs, the oil ratio is thrown off bc it was calibrated for a stock rev'ing motor.

[islandscoots]

don't know why there was that check valve. All the shops I talked to were not familar with it either. Could have been that the person I bought it from put it in there.

[ex-racer#2]

Cuz I think I'm running lean. My plug reads greyish with a tiny hint of red-brown. I havn't got a tach yet, so I was just gonna add a lil oil until then. I want my scoot to last a good 7,000 miles (even though I'm gonna stage duece the baby!)

Leanness and oil ratio's are different things.

Lean or rich refers to the ratio of fuel to air. 14.7:1 is considered perfect.
Oil ratio to fuel is seperate and oil pump systems it is determined by throttle position or crank speed and sometimes both. Depending on state of tune this can vary from 30:1 fuel to oil or as little as 50:1 or less. (Premixed values).

Now in premixed systems a lean situation will complicate this further as there is less oil present when the added heat from lean running dictates you need more lubricant. At the other end when you chop the throttle and it sucks up additional fuel (compared to air) you get more oil as well when you need it least.

Now in a situation when you run out of gas..... you may seize with premix as there is no oil delivery. With pump no big deal most of the time.