As the title states... has anyone used this kit? As well, any pros vs cons? Curious to see if this will be a benefit to the motor in regards to lag time for oil delivery and would this richen up the mixture (air/fuel) as you no longer have oil in the float bowl from the fuel pump?
mopar1rules
Active member
a fellow here at a local motorsports shop, installed the bender direct oil injection system on 2 '00 srxs and they never ran so poorly before. plugs liked to foul out and such. also, my good buddies '92 v-max 4 came w/a direct oil injection kit when he bought it, and he could never figure out why it would foul plugs and load up, if it idled for any period of time. also, when starting the sled cold, you better get off the choke immediately once it started, cause otherwise it would puke the plugs. this sled has psi quad pipes and is jetted leaner on the bottom end, then what psi suggests, and it would still foul on the bottom. i told him to take off the crappy oil injection system and he did. hasn't fouled a plug since and now runs crisp. moral of the story, LEAVE THE STOCK OIL INJECTION SYSTEM ALONE ON YOUR SLED. YAMAHA HAS IT SETUP JUST FINE. my take is that the oil just gooobs and spits in thru the brass injection jet, instead of mixing properly and throughly inside the fuel pump and then misting out nicely thru the pilot and main circuit passages, into the venturi of the carb. also, his reeds were always coated w/thick oil w/the direct injection. now its not like that w/the stock oil injection setup. i wouldn't waste the money on the bender oil injection kit. put that cash towards clutching.
Back in "The Day" I think it helped the 1981 SRXs[I have one that still runs!] and the 1983 + up VMAX540s but since then I would recommend sticking with the factory setup.
Thanks for the response! That's what I was hoping to get... real world experience! Made that decision easy!!!
unchained
New member
Also, redirecting the oil to the engine without mixing in the fuel pump also affects jetting as well. Because the oil displaces fuel, the factory jettnig is calibrated for the oil that is taking up space as it travels through a jet, etc. By removing the oil, your adding lots of fuel. Like the others already said, dont go there if you ask me...
Sheermadness03
New member
I have Benders direct oil injection kit installed on my 03 viper and have since 04. I have found no ill effects as stated above. I have never fouled any plugs to date and the viper runs great. 4606 miles never apart. -Ed
cheapsx
New member
I have one of those kits and some of this talk has answered my questions. I have a 97 sx, picked it up with a bad crank bearing. Before i fixed it a pal gave me a bender injection kit so i used it. The theory is it gets the oil in quicker to those crank bearings from what i understand. Compared to where psi tells me to jet this motor i am down one pilot size and lower on the needles. It is still a little rich but i dont want to be on the edge either. This all makes sense now seeing how oil dispaces fuel, duh. I have been bitchin about fuel econ and got 9mpg the other day, maybe not to bad. My poblem is a rich spot right at 5200-5400 rpm. Long trail rides and no blasts on the lake seem to take their toll on the plugs. Once in a while i get a bang or two out of the pipe. Its right in a tough spot to fix. I added reed spacers this year and that seemed to make things richer on the bottom. Oil use has been troublesome too. I am at 24 mm on the oil pump cable to get the oil use correct. Hopefully that will help the occasional plug fouling. Just thought i would give some input, I havent had it the other way so i cant say this thing is better.
daman
New member
All the phazers '84-98 are direct injection as are the old enticer twins srv's,ss440 ,etc and they work just fine,direct injection is where it's at IMO.. responds quicker to throttle rpm position. wish yammie would have kept it.
PZ 1
Member
- Joined
- Mar 12, 2005
- Messages
- 987
The reason for Yamaha injecting the oil into the fuel was to lubricate the carb slides to prevent scoring. There is no need for that on the butterfly carb sleds, so the oil is injected after the carbs. Changing to the Bender kit will cause carb slide scoring.
unchained
New member
Yeah as long as you recalibrate the jetting accordingly. Been there done that and its not worth the hassle.daman said:
daman
New member
that would take forever to take place tho,lots of guy's running that bender set up wo issue,i don't think that was the only reason,reliability of oil supply
was one i heard through the grape vine years ago..
was one i heard through the grape vine years ago..
unchained
New member
My statement isnt a theory, its a fact.Sheermadness03 said:
daman
New member
They where like that from the factory.stock set up,unchained said:
unchained
New member
Im well aware of that. If you chose to change the later models from fuel pump to direct, you need to rejet to compensate for the added fuel flow as a result of the absence of oil as it was originally calibrated from the factory. I agree direct is ideal. My F7 and Dragon are both direct....daman said:
daman
New member
correct yes jetting would maybe need to be adjusted some.
Sheermadness03
New member
unchained said:
My statement is a fact also. -Ed
Does nobody realize there is oil pumping from the oil pump directly to the crankcase already on a stock machine? Why change something that already works great?
mopar1rules
Active member
cheapsx said:
get rid of that direct oil injection kit and then jet it to what psi says. you will probably be spot on. it was a night and day difference with my buddies v-max 4, when we went from direct oil injection, to the stock setup w/oil into fuel pump.
