Oil injection removal... Is it worth it? What are the benefits? Talk to me....

[joeak47]

As I've always stated before,I have ALWAYS ran the stock yamaha blaster oil injection without ANY issues what so ever for many years. this is on the modified engines too (ported,head work,etc,etc)

Whatb I would like to know,is what benefits can and will get if I remove the oil injection system,and start premixing???

Please don't waste your time telling me how the oil injection system is un-reliable,breaks all the time, fails when you least expect it,etc,etc,because I know better. I've NEVER had issues.

What I would like to know what the benefits are >>>

More power?
Better idle?
Easier starting?
Cooler running?
More power?
Less hassle?
More power?
More power?

Seriously...Talk to me. I want to try it without the oil injector,but what are the benefits?

 

[Awk08]

i too ran the stock oil injection for over 8 hard years on my first blaster, a brand spanking new '96.
sold it with the stock piston/rings and injection still on it and working like the day it was born.
i do have to add, that bike was the ONLY time i've ever fouled a plug, during the first few days break-in period.
i have never fouled a plug since, on that, or my pre-mix blasters.
both my current blasters were bought with the injection already removed.

but.....i believe i've read that it injects at up to a 20:1 ratio ???
(but damn a tankful lasted forever, vs. a bottle of mix oil ?)
does the ratio vary as rpm's increase ???

that being true.........
pump spinning faster = more oil injected ???
i'd say mixing is a more consistant way to get exactly the ratio you'd like into the motor, at all times,
not 40/50:1 @ low rpm's, and 20:1 @ high rpm's

can anyone confirm how the injection could spray the same ratio at all rpm ranges ???

for testing purposes joe, maybe you could extend/route the injection line back into the resiviour tank, to insure the pump never runs dry, always pumping fluid ?
so you could try a tankful of mix, and report your findings.
then if you want, just rehook the injection line and continue injecting.
remember to block off the carb nipple with an 1/8" vaccuum cap
while running the mix

 

[joeak47]

I would figure that the oil injector pumps 20 to one at idle (carb closed and idling = very little air/fuel entering engine) and pumps 20 to 1 at 8,000rpm (wide open throttle,and lots of air/fuel entering the engine. In other words low rpm's=little oil,and high rpm's = lots more oil.

 

[blasterdemon7]

I feel injection is fine on a stock motor because it's calibrated by the gear ratio to keep the oil/ fuel mix at a safe ratio. When you start doing mods that demand more fuel, your mix will start to lean out oil wise to a point depended on the increase in fuel demand over a stock motor.

 

[Awk08]

I feel injection is fine on a stock motor because it's calibrated by the gear ratio to keep the oil/ fuel mix at a safe ratio. When you start doing mods that demand more fuel, your mix will start to lean out oil wise to a point depended on the increase in fuel demand over a stock motor.

/\good point, as with the carb jets, why would the injection jet not need richened also, as the air/fuel jetting ratio increases with mods

plus...injecting limits you to a stock carb only

 

[joeak47]

/\good point, as with the carb jets, why would the injection jet not need richened also, as the air/fuel jetting ratio increases with mods

plus...injecting limits you to a stock carb only

Awk08,Did you notice a difference in power?

 

[Awk08]

Awk08,Did you notice a difference in power?

there was a 5 year span between my injected '96 blaster and my current ones, life happens.

like said, both my current blasters were bought with it already removed, mine fried the second day i had it, and my black one was bought fried,
i added mods (pipes/reeds/filters) during the rebuilds, so never really returned to stock to compare
but i did notice a considerable gain when going to my 34mm carb vs. the stock 26mm

 

[blasterdemon7]

why would the injection jet not need richened also, as the air/fuel jetting ratio increases

That's the problem. There is no adjustment. The gear ratio is determans the oil ratio and as fare as I know, Yamaha doesn't sell optional gears to let you change that ratio.

 

[Awk08]

why would the injection jet not need richened also, as the air/fuel jetting ratio increases

That's the problem. There is no adjustment. The gear ratio is determans the oil ratio and as fare as I know, Yamaha doesn't sell optional gears to let you change that ratio.

or different size injection nozzles for in the carb


so....we're coming to the conclusion that yamaha is probably injecting the oil at a very safe, fairly rich ratio, to allow for even a few mods ?
mixing at an exact ratio has to provide more power !!!!

 

[blasterdemon7]

or different size injection nozzles for in the carb


so....we're coming to the conclusion that yamaha is probably injecting the oil at a very safe, fairly rich ratio, to allow for even a few mods ?
mixing at an exact ratio has to provide more power !!!!

That's very close to true. The oil ratio is set To have a small Safty margin to compensate for small changes in jet size do to varying elevations in the locations of the dealerships selling them. The purpose of Yamaha going with the oil injection system was to make it easier to maintain and with that, hope to increase sales over other brands do to that fact.