L250T To premix or Oil Inject?

[Badger2008]

First thanks to everyone who answered questions on this project so far.

Ok The 1995 250 Yam project goes well. It is on the boat and after a full carb rebuild and a bunch of other crap it fires up and runs (A week of evenings and $200 in parts to rebuild all 6 carbs) It is linked and sync and running.

All Test running has been done with 50:1 premix so far.

OK now about the Oil Injection.
This is a 15 year old motor. How reliable are these old pumps? I dont trust the sensors on a motor this old and I know if one line plugs its over!

Is there a big advantage to having it oil feed? vs the reliablity of premix?
Will it foul the plugs on 50:1? Kill the fuel consumption?

If I go to Premix what is the conversion proceedure? (They dont put that in the manuals)

I have used premix for years and I dont find it a bit difficult to do. So if theres no major drawbacks I'd like to go that way.

Again thanks to everyone so far.. I could never have afforded a bolt on and go motor.

 

[rodbolt]

Re: L250T To premix or Oil Inject?

if maintained the oil injection is way more reliable than you will premix.
the 250 needs 25 gallons of gas an hour if you run much above about 4500 RPM.
means you need at least a 100 gallon tank to go anywhere.
premixing large tanks gets tricky.
and, there are NO sensors for the oiling system.
4 switchs but NO sensors.
you do need to test/inspect the engine oil tank switchs at least every 6 months.
do some forum searchs for precioson blend and 3.1L motors.

 

[Badger2008]

Re: L250T To premix or Oil Inject?

Thanks Rodbolt! You allways shoot me strait answers

 

[Badger2008]

Re: L250T To premix or Oil Inject?

After much research I can see the issue with Yamaha. They are a gear driven. I am used to dealing with older OMC stuff where you just go to premix without question.