If you're building a dedicated racer then yes, go to pre-mix. Easier to work on the bike (less clutter) and more accurate for continued high rpm use. You'll need to increase jet size to compensate for the oil in the fuel.
If you're an occasional trackday boy, then stick with the pump. Accurate enough for a 90% comitted track attack, and you won't have the headaches of carrying oil around with you and mixing at the pump during your everyday street rides.
If you'll not see the race track then stick with the pump.
If I were you? Pre-mix Why? Because I hate clutter on the bike, and I can't stand having to remove and refit the 2T oil tanks on any stroker I work on.
Then again, if I were you then you'd be me, and I'd be asking you the questions
Thanks Matt. I was just looking at how much hardware I can lose by going premix. I'm ok at math so oil mix should be ok (will know in a hurry if not!!) This is my first NSR so not sure what to fine tune. _________________ Eric
It's much easier to work on with the oil injection removed, but unless you are pulling barrels off every 100 miles, I don't see the point.
The worst thing on a predominantly "street" bike is when you run pre-mix and hit reserve when you are flat out, run down a long hill on a closed throttle, or even under longer periods of closed throttle under braking, you are shutting off lubrication to the crank.
As Matt says, if you are accurate at measuring the fuel:oil ratio, then the mixture is more under your control which can be a great benefit when fine tuning a racer. Correct fuel:oil ratio can significantly effect hp and peak rpm. We had an RGV at one dyno day that picked up 1hp just by properly adjusting his oil pump!
The NSR oil system is pretty tidy though, and very convenient with the aux reservoir tank easily accessible. I'll be keeping mine in place on the 21 (I'm chasing 70hp with stock pistons and oil injection), but pre-mixing the 16 and 18 F3's. _________________ Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
Also, premix uses about 3 times the amount of oil, the pump though rather basic compared to the TZR v-twin returns a lot better than 30-1. _________________ Please do not PM me technical questions, if you can't find it on the Forum start a thread
And obviously your bike will smoke a heck of a lot more on tick over and when you warm it up which you may or may not view as pretty cool. _________________ Please do not PM me technical questions, if you can't find it on the Forum start a thread
Talking to Geoff at Rock Oil this weekend he was saying alot of the racers using Rock are now running 40:1 which is alittle more like what we used to run the MX bikes on.
I personaly still run 33:1 though down from HRC recomended 30:1.
Still on 40:1 it wouldnt smoke that much... ever lol _________________ If I have to take the carbs off once more...
my mz smokes on 50:1 even when hot :/ and smoke is cool and smells nice
i am a big fan of the pump just needs to be checked every now and then and keep an eye on the exhuast to make sure she smokes still. _________________ Honda nc23 CBR400 AERO 1986, 1990 honda NC23 Tri-Arm, 1987VFR400 NC24 Rothmans Rep, NSR250 MC16 1987, CL250s 1983. Moto guzzi zigolo 110cc 1958. Fantic 50cc 1972. Suzuki Cobra Race bike 500cc 2t 1975 , GP125 1975. Triumph T110 1954. BSA Thunderbird 1955. Ariel VB 600 1952, 1990 MuZ 125 etz.
Is it possible to run premix for everyday use due to oil pump failure and go to the gas station and put petrol in the tank and then put the correct amount of oil in the tank and then shake the bike to atomize the mixture?
I have seen people doing this but is it safe?
It not perfect to mix it at the station but its doable. Turn the tap off though before you add the oil. _________________ If I have to take the carbs off once more...
NSR-LOVER wrote:Is it possible to run premix for everyday use due to oil pump failure and go to the gas station and put petrol in the tank and then put the correct amount of oil in the tank and then shake the bike to atomize the mixture?
I have seen people doing this but is it safe?
Your actually better off putting the oil in first, then putting the petro in. let the rush of gas help with the mixing of the petro, then follow it up with the some shaking of the bike.
of course to do this you need to know pretty much how much fuel you need prior to putting it in so you get the proper oil mixture.
The other option is to carry a couple gallon fuel jug with you and a mix cup to measure up your oil _________________ Charles Gallant
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Why? Because I hate clutter on the bike, and I can't stand having to remove and refit the 2T oil tanks on any stroker I work on.
