cota315r Posted July 30, 2007 Report Share Posted July 30, 2007 Hi Just bought a Cota 315R and according to the manual the mix should be 80:1. I think that is 80 parts of petrol (in UK liters) to 1 part of oil (it gives the oil in cm cubed). First I don't know how to work out what 1cm cubed is in plain English. Is it 1ml? Also my brain hurts when I try and work out how much 80 parts of 1 liter is! Is it 800ml? If this is correct , and I really doubt it is, then for every 800ml of petrol I should put 1ml of oil. So for a 5litre can of petrol I should put in 6.25ml right? Seems a bit on the weak side to me. My crosser has nearly double this. Guess I got my math wrong right? Can somebody correct me and explain to me how I work out what I should actually put in a 5litre can of petrol please! Cheers John Quote Link to comment Share on other sites More sharing options...
ruffrider Posted July 30, 2007 Report Share Posted July 30, 2007 Hiya, Here you go, 80:1 means for every 80ml of fuel you need 1ml of oil So for 5 litres, that means 62.5ml of oil (5000ml/80 = 62.5ml) Quote Link to comment Share on other sites More sharing options...
sr34 Posted July 30, 2007 Report Share Posted July 30, 2007 found this a while back when i had the same question hope it helps http://www.beta.id.au/2%20Stroke%20Fuel-Oil%20Ratios.htm Quote Link to comment Share on other sites More sharing options...
cota315r Posted July 30, 2007 Author Report Share Posted July 30, 2007 Hi Thanks chaps thats cleared it up for me! Its roughly half what I put in my crosser. Think I need to get a measuring jug to make sure I get it right and than have 2 separate cans of premix! Cheers John Quote Link to comment Share on other sites More sharing options...
penno350 Posted July 30, 2007 Report Share Posted July 30, 2007 HiThanks chaps thats cleared it up for me! Its roughly half what I put in my crosser. Think I need to get a measuring jug to make sure I get it right and than have 2 separate cans of premix! Cheers John Just think of each litre as a 1000 (thousand), divided by 80 gives you 12.5 so as already posted 62.5 for 5 litres. I run my 2003 315 at 80:1 on the strawberry flavoured Ipone oil with no problems. Graham Quote Link to comment Share on other sites More sharing options...
cadman Posted July 30, 2007 Report Share Posted July 30, 2007 HiThanks chaps thats cleared it up for me! Its roughly half what I put in my crosser. Think I need to get a measuring jug to make sure I get it right and than have 2 separate cans of premix! Cheers John 80:1 always worked for me, when using Fully SYNTHETIC oil. Your MX bike needs more oil as it spends more time at higher rpm's. Trials bikes spend a lot of time at low rpm's. However if your going to trail ride your 315 have a think about the 80:1, you might want to go back to factory recommended 1.5% which is 66:1 Quote Link to comment Share on other sites More sharing options...
dgshannon Posted July 30, 2007 Report Share Posted July 30, 2007 (edited) HiJust bought a Cota 315R and according to the manual the mix should be 80:1. I think that is 80 parts of petrol (in UK liters) to 1 part of oil (it gives the oil in cm cubed). First I don't know how to work out what 1cm cubed is in plain English. Is it 1ml? Also my brain hurts when I try and work out how much 80 parts of 1 liter is! Is it 800ml? If this is correct , and I really doubt it is, then for every 800ml of petrol I should put 1ml of oil. So for a 5litre can of petrol I should put in 6.25ml right? Seems a bit on the weak side to me. My crosser has nearly double this. Guess I got my math wrong right? Can somebody correct me and explain to me how I work out what I should actually put in a 5litre can of petrol please! Cheers John The easiest way to do it is use a Ratio-Rite mixing cup. Takes all the guesswork out of it. Link: http://www.tryalsshop.com/detail.aspx?ID=176 The marks only go up to 70:1, but it is easy to tell where 80:1 would be. Edited July 30, 2007 by DGShannon Quote Link to comment Share on other sites More sharing options...
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