lords88
New member
I am wanting to go to straight pre mix for my 944 UBR engine in fear that the stock oil injection might fail. Right now it still has the stock 700 MM oil injection. Does anyone sell a kit to remove this? New to yamaha sorry, I wish I new more about these engines.
A K MtnViper
New member
Stock is very close to fool proof. Mixing at the gas pump has a higher margin of error in my opinion
lords88
New member
We premix all of our other sleds (polaris). I just don't want the oil pump to even have a chance of failing and leave me sitting with a toasted motor. If it is not possible I will jsut deal with it but if I can I would like to remove it and go straight to premix.
After logging over 4000 miles on a 97 SX 700, and it having a total of 7400 miles on it...and having rode thousands more on a 05 Viper Mtn, I would not even worry about an oil pump failing on me. I can understand why you don't want to take the risk, but I have yet to hear of an oil pump fail on a redhead 700.
yamaha oil pumps tend to fail in a way that it floods the motor with oil. have not heard of too many on here that failed to pump oil period. most of them get changed because of exessive oil consumption, not because they do not work.
Haven't had one out in a while, but doesn't the pump have a couple lines running to the feed the crank bearings on the redhead? Seem to remember them being there. Like was said above, most of the time if the pump fails it goes to full open. If it really bothers you, fix your fuel at 100:1 in conjunction with the pump. That should keep it running 90% of the time if the pump were to go to 0 flow.
lords88
New member
Well if the pump does fail all they do is flood the engine with oil I no longer have any worries. Thanks again fellas, I really appreciate the great advice!
ViperXC
New member
I can vouch for the pump as well. I had to replace one that was dumping a lot of oil thru the engine and the previous owner had it adj down as far as he could.
i think that oil injection system also lubes the water pump bearing. you wont get that with premix. post this question in the sx/vmax category for a little more exposure as the engine is the same, non pv 700 triple.
Ryan B said:
Has 1 to the bottom of the crankcase. And another between 2 points on the case.
Snowdad is also correct in that it goes to the water pump bearing.
And I second the oil pump failure dumping oil than none. That's all I've heard on this forum when an oil pump goes bad. They go full open.
