premix question

[mr-jermy]

hi guys ive got a ns125Rl which i've just done a top end rebuild on and have heard to get it up and running first off it would be best to use premix fuel can anyone confirm this and also if it is to be premixed what is the ratio? thanks

[Pete.]

Assemble it with 2-stroke oil as an assembly lube and make sure your 2-stroke pump is properly primed and working. It will start feeding 2-stroke oil directly you start the engine.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[mr-jermy]

thanks for the reply yeah i assembled it using 2 stroke oil, where do i find the pump? and how do i figure out if its working or not? (sorry to sound like an idiot) thanks

[Pete.]

Follow the throttle cable. It splits into two, one half will go to the carb and the other half to the oil pump. On the pump should be a screw for priming it, should it ever be run out of oil.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[mr-jermy]

awesome thanks dude will have a look friday when i will actually get back from work when there still a bit of light and see if i cna sort it out thanks

[Suntan Sid]

What Pete said is correct, however a fail safe method is to use half a litre of premix, disconnect the 2T oil feed pipe from the carb.

Start it up, (it's easier with two people to do this), while you rev the engine turn the fuel pump by hand, to the max, until you get a good, regular flow of 2T oil coming from the pipe, then connect the pipe to the carb.
If you don't have a clear 2T pipe this is the only method were you can be, reasonably, sure there is no air in the system.
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"Everybody needs money, that's why they call it money!"

[mr-jermy]

awesome thanks for the help, just so i know what is the ratio for the pre mix? thanks

[andym]

almost positive it's 25-1 for running in then 50-1

[Boxing]

It'd be a lot easier to not mix the oil yourself!

A few reasons for this, if your mix isn't correct and you run it too lean or too rich, both are bad for the engine. And every time you fill up, you have to add oil, so if you fill up every time the reserve comes on, chances are, you'll be running it rich. If you do pre-mix, you have to be good with maths and figure out how much oil you need per litre, and figure out how many litres are in a full tank, best way to do this, is probably to empty the tank, completely empty, then fill it up to the brim at the petrol station and write down how many litres it's holding.

When I had a two stroke and had to mix it myself, I used one of these:

https://csimg.pricesavvy.co.uk/srv/GB/29045726b007hlaiha/T/140x140/C/FFFFFF/url/fuel-mixing-bottle-mini-moto.jpg

Mixed the amount of oil I needed into there, then get a jerry-can of unleaded (5 litres) then add the exact amount needed to the jerry-can. Never had any problems with any of my two-stroke engines using this method.

If you do mix yourself, don't forget to give the bike a good shake straight after filling up, to make sure the two-stroke mixed in.

[MarJay]

Don't use premix, it'll make the bike run lean.

Just use the oil pump as Pete says.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[bikenut]

:karma: hi dude,

i would use some premix at the eng start stage and run for some 10 mins or so, then go back to straight petrol and the lube pump.

20:1 ratio

the pump will have a bleed screw on it but have you cleaned the oil tank, cap and filter??

set the pump to full oil delivery on initial run up, no revs just idle.

you will see oil issuing forth or coming, from the oil pipe to the carb.

when no bubbles from this pipe, refit and finish off the 10 mins worth of premix ( test tank ).

note block the carb oil pipe stub on run up.

the worst that will happen is the plug will foul and stop eng.

you know how to set the oil pump, right??????

[mr-jermy]

thanks for the advice sounds a bit complicated so might have to consult my haynes manual, I have no idea how to set an oil pump up as i've not done this before the only other work i've done is on a 50cc moped or my car and never this technical, so all and any advice is most welcome and much appreciated. thanks

[bikenut]

:karma: not to difficult, see marks on pump cable "lever" and marks on pump body. You have primed the pump and bleeded via small screw at topish of pump, open and let oil dribble till no more bubbles come out.

post some pics.......

[mr-jermy]

ok cool i'll have a look tomorrow as im only in for half a day at work tomorrow and i'll see if i can get some pics up, there pics on the following links of how it was when i first got it and how it is now, https://www.facebook.com/media/set/?set=a.3856018992324.159705.1033823182&type=3

https://www.facebook.com/media/set/?set=a.3916132575126.160960.1033823182&type=3

Will get back with more pics asap