July 30, 200719 yr 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
July 30, 200719 yr 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)
July 30, 200719 yr 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
July 30, 200719 yr Author 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
July 30, 200719 yr 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
July 30, 200719 yr 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
July 30, 200719 yr 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, 200719 yr by DGShannon
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