How To :- Work Out Premix


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Post Tue Oct 16, 2012 8:37 pm

How To :- Work Out Premix

This is a quick guide to work out how much oil you need when making up a premix.

With 2 strokes they need oil to lube the piston and some engines come with an oil pump that feeds the carb with oil to mix with fuel before it enters the cylinder. other 2 stroke engines don't have an oil pump and require 2 stroke/premix oil to be mixed with the fuel before putting in the fuel tank.

refer to the manufacture spec for the correct ratio of premix you need for your engine.

For an example when you are bleeding the NSR oil pump, you need to run the bike on premix or you will seize the engine. Honda recommends this ratio to be in between 50:1 and 25:1.

The maths

convert all your amounts to the same unit, in this example we are working in ml

F = Amount of fuel
R = The ratio you wanting to mix at
O = Total amount of oil needed for the mix


Formula

F/R = O

for example if we wanted to make a premix up with a ratio of 25:1 this is how we work out the amount of oil we need for 1ltr of fuel

1ltr = 1000ml

1000 / 25 = 40

so we need to mix 40ml of oil with 1ltr of fuel


remember the higher the ratio the less oil there will be.


50:1 = 1000ml - 20ml oil
40:1 = 1000ml - 25ml oil
30:1 = 1000ml - *34ml oil
25:1 = 1000ml - 40ml oil

*rounded up
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Post Tue Oct 16, 2012 9:35 pm

Re: How To :- Work Out Premix

But wot if i wanna mix 3/4gallon?


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Post Tue Oct 16, 2012 9:40 pm

Re: How To :- Work Out Premix

:palm:


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Post Tue Oct 16, 2012 9:52 pm

Re: How To :- Work Out Premix

with a teacup?
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Post Tue Oct 16, 2012 9:53 pm

Re: How To :- Work Out Premix

herbalisticharry wrote:But wot if i wanna mix 3/4gallon?


€$¥ l!f€ B0i :farmer:


:lmao: :lmao: :lmao: :lmao:

us or uk gallon lol

:lmao: :lmao: :lmao:

and what ratio
@25:1
US then its

2840 / 25 = 114ml oil

UK gallon then its

3400 / 25 = 136ml oil
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Post Tue Oct 16, 2012 10:06 pm

Re: How To :- Work Out Premix

UMMM..IS THIS DONE AT THE PUMP READY THEN?????? :61:
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Post Tue Oct 16, 2012 10:08 pm

Re: How To :- Work Out Premix

bombdoctor wrote:UMMM..IS THIS DONE AT THE PUMP READY THEN?????? :61:


not if your running a 2 stroke which requires an oil premix lol
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HOW CAN WE WAIT UNTIL TOMORROW NIGHT..
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Post Tue Oct 16, 2012 10:09 pm

Re: How To :- Work Out Premix

it used ta be, mixed with 2 or 3 star.. :farmer:
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Post Tue Oct 16, 2012 10:11 pm

Re: How To :- Work Out Premix

TWO STROKE........

THAT'S what LENNY & CARLOS have when they see a pretty woman????? :shock:
"The credit belongs to the man who is actually in the arena, who's face is marred by dust & sweat & blood; who strives valiantly...... & who at the worst, if he falls, at least falls while daring greatly"
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Post Tue Oct 16, 2012 10:14 pm

Re: How To :- Work Out Premix

dunno, i'm not an old git, all i can remember is that the stars was the grade of the petrol back then :07: :07:
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Post Tue Oct 16, 2012 10:15 pm

Re: How To :- Work Out Premix

and sometimes thats debatable ..


animal



vegetable










mineral....










or :gay:
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Post Tue Oct 16, 2012 10:16 pm

Re: How To :- Work Out Premix

blagger wrote:dunno, i'm just an old git, and i can't remember much these days...i drank alot of the petrol back then :07: :07:






who are u tryin to kid??? :palm:
Last edited by herbalisticharry on Tue Oct 16, 2012 10:17 pm, edited 1 time in total.
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Post Tue Oct 16, 2012 10:16 pm

Re: How To :- Work Out Premix

blagger wrote:dunno, i'm not an old git, all i can remember is that the stars was the grade of the petrol back then :07: :07:

DITTO ........

I remember this new fangled unleaded shit as well.......... :kev:
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Post Tue Oct 16, 2012 10:24 pm

Re: How To :- Work Out Premix

nice!

pretty simple to follow that, i ran the aprilia 38:1 on the road - superteens used to run it at around 28:1 iirc?
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Post Wed Oct 17, 2012 6:32 am

Re: How To :- Work Out Premix

bombdoctor wrote:
blagger wrote:dunno, i'm not an old git, all i can remember is that the stars was the grade of the petrol back then :07: :07:

DITTO ........

I remember this new fangled unleaded shit as well.......... :kev:

see that's why you are mad and all init... All that lead!!!!!


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