How much 2 stroke should i mix with my sherco 250 03 model,

at the min am mixing 25:1 in 5L of petrol many thanks.

80:1 is a reasonable ratio. Thats 80 parts petrol to 1 part oil, or 63ml of oil per 5L of petrol. For this use a good quality fully synthetic oil.

Yes tt5th has it pretty much spot on.

I have a 2003 290 and run it at 80:1.

12.5 mls per litre.

I usually make 4 litres up, so thats 50 ml of decent two stroke oil to 4 litres of petrol giving some slosh space in a 5 ltr can.

THANKS GUY'S BEEN VERY HELPFULL

I WILL DO THT NXT TIME I FILL MY CAN UP

CHEERS!

sorry but is 80ml oil in 5l petrol 100:1? If so I reckon that may be aiding my fuel problems?

sorry but is 80ml oil in 5l petrol 100:1? If so I reckon that may be aiding my fuel problems?

Do they offer MATH in school, there? Example!

5000 / 62.5 = 80:1

4000 / 50 = 80:1

or

5000 /80 = 62.5 ml

4000 /80 = 50 ml

Now try your own with just one liter! Convert all that to a US gallon jug an tell the answer! in ml!

Ive just never sat around and thought about it. The dealer just told me to use 80ml per 4.9 litre. Used it ever since but never really had a strong tickover!

Will try it tommorow when mixing the fuel up.

blimey, ive never run a 2 stroke at those kind of ratios.. 33:1 is best for 2 strokes and dont use a motocross race oil as its 2 heavy.. you need a good road 2 stroke oil.. like helix 2t or morris plus 2...

you loose power running too rich and there is less lubrication for the engine parts.

Edited March 15, 201016 yr by BenC1980

I got told and have mixed 10 litres up with 200ml of oil in. Is this far too much?

I got told and have mixed 10 litres up with 200ml of oil in. Is this far too much?

no thats fine,

Good, I was paranoid about leaving the dregs in the bottom of the measurung cup but after reading that some people only put 62ml into 5 litres I'm not so worried now!

http://www.rctek.com/pdf/fuel_to_oil_ratio_chart.pdf

i use 33:1

but you must not use oil designed for motocross bikes its designed for engines that are flat out all day long and they will foul the plug.. you must use a light road 2 stroke oil..

Edited March 15, 201016 yr by BenC1980

Can't say I've ever fouled a plug in a trials bike while running 80:1 with a good oil-Motorex powercross which claims to be usable up to 100:1 in mx bikes

Can't say I've ever fouled a plug in a trials bike while running 80:1 with a good oil-Motorex powercross which claims to be usable up to 100:1 in mx bikes

you wont at 80:1 becuase theres not much oil in there..

80:1 is plenty

Im surprised yours runs at all using 33:1!!!!!!!

It must be choking up your pipe.