Two stroke premix?
Author
Discussion

lancepar

Original Poster:

1,115 posts

194 months

Monday 29th December 2025
quotequote all
Which forum should I ask about premix for 2 stroke engines, nothing too technical.?

Cheers
bow





Metric Max

1,814 posts

244 months

Monday 29th December 2025
quotequote all
What are you using it in?

normalbloke

8,439 posts

241 months

Monday 29th December 2025
quotequote all
Aspen fuels. Just buy it in ready made….

Panamax

8,024 posts

56 months

Monday 29th December 2025
quotequote all
Always buy the good stuff. There's a useful article on Wikipedia covering the significance of synthetic oil etc,
https://en.wikipedia.org/wiki/Two-stroke_oil

alangla

6,212 posts

203 months

Monday 29th December 2025
quotequote all
I used to make my own. Buy a mixing bottle with lines for the volume of petrol and oil, fill to the first line with petrol, second line with oil and shake the bottle.

The_Doc

5,924 posts

242 months

Monday 29th December 2025
quotequote all
Newer stuff 40:1 or 50:1, you won't accurately measure the difference, it all comes out at 45:1 if you mix at home!

Use synthetic fuels so the ethanol in forecourt fuel doesn't degrade and block your carburettor.

Old stuff (like 30+ yrs old) use 25:1

alscar

7,894 posts

235 months

Monday 29th December 2025
quotequote all
Stihl do the 100ml top up shots which added to a full 5 lt give you the 1:50 mix or as said already Aspen although pre mixed its not particularly cheap.

Soloman Dodd

657 posts

64 months

Monday 29th December 2025
quotequote all
A can of petrol and a bottle of two stroke oil, easy.

Just look up the required ratio in the engine manual.

Cow Corner 2.0

21 posts

2 months

Monday 29th December 2025
quotequote all
While mixing up 2 stroke fuel is easy, I have been seriously considering going down the Aspen pre-mix route for the extended working life of the fuel - as an irregular user of my chainsaws etc, it’ll just be easier to not having to worry about fuel going off in the tank or containers.

Haven’t looked at the costs yet…

1690cc

205 posts

38 months

Monday 29th December 2025
quotequote all
Premix is fine if you only use small amounts. Otherwise it is over double the cost of mixing it yourself.

You are only mixing two things it's not high level chemistry.

Plastic jug, smaller plastic beaker, both with lines drawn on, fill each to line and tip into cleaned out plastic 4 litre milk containers.

I mix about 12 litres at a time every couple of days in the autumn for the leaf blower and I'd struggle to take longer than 5 mins each time.

For peace of mind I use Tesco E5 petrol and Sthil Ultra and at the end of the season squirt a little Honda fuel stabilizer into the final few mixes.




trickywoo

13,537 posts

252 months

Monday 29th December 2025
quotequote all
E5 and pro kr2 at 50:1.

Mix and use as fresh as you can but I have mix in my chainsaw for months at a time and it always starts ok.

lancepar

Original Poster:

1,115 posts

194 months

Monday 29th December 2025
quotequote all
Thanks guys but I was looking for a link to a forum on Piston Heads, where peeps race old 2strokes.

In the 60's we used to add a spot of R in the fuel tanks of our 4 strokes so that the smell of R could be sniffed.

I'm in my 70's but still ride bikes and prefer to exhibit small lightweigh jobbies at shows.

I know the ratio for my recently aquired 50cc Romet and have used the correct ratio of R in the premix but how do I get the aroma stronger?

drink




trickywoo

13,537 posts

252 months

Monday 29th December 2025
quotequote all
lancepar said:
In the 60's we used to add a spot of R in the fuel tanks of our 4 strokes so that the smell of R could be sniffed.
Fuchs pro kr2 gives that smell and is also great oil. I’ve got my 7 year old hammering around the garden in a Franco morini engined 50 fuelled with that just for the smell.

troika

2,065 posts

173 months

Monday 29th December 2025
quotequote all
Mix it myself for strimmer / leaf blower / chainsaw using v power or esso super (E5). Throw in some fuel stabiliser for good measure. Lasts over winter, fires straight up in the spring with no issue.

normalbloke

8,439 posts

241 months

Monday 29th December 2025
quotequote all
lancepar said:
Thanks guys but I was looking for a link to a forum on Piston Heads, where peeps race old 2strokes.

In the 60's we used to add a spot of R in the fuel tanks of our 4 strokes so that the smell of R could be sniffed.

I'm in my 70's but still ride bikes and prefer to exhibit small lightweigh jobbies at shows.

I know the ratio for my recently aquired 50cc Romet and have used the correct ratio of R in the premix but how do I get the aroma stronger?

drink
Umm, awkward..

craigthecoupe

943 posts

226 months

Monday 29th December 2025
quotequote all
lancepar said:
Thanks guys but I was looking for a link to a forum on Piston Heads, where peeps race old 2strokes.

In the 60's we used to add a spot of R in the fuel tanks of our 4 strokes so that the smell of R could be sniffed.

I'm in my 70's but still ride bikes and prefer to exhibit small lightweigh jobbies at shows.

I know the ratio for my recently aquired 50cc Romet and have used the correct ratio of R in the premix but how do I get the aroma stronger?

drink
Maybe try posting in biker banter and see if that gets you any help? i think any premix/2stroke chat here will be garden machinery based.thumbup

FlyVintage

325 posts

13 months

Monday 29th December 2025
quotequote all
lancepar said:
I know the ratio for my recently aquired 50cc Romet and have used the correct ratio of R in the premix but how do I get the aroma stronger?
Castor oil creates the smell you seek; unfortunately modern 2 stroke oils tend to be synthetic blends. You could try mixing a little castor oil into what you are currently using; though it won’t run as clean.

trickywoo

13,537 posts

252 months

Monday 29th December 2025
quotequote all
FlyVintage said:
Castor oil creates the smell you seek; unfortunately modern 2 stroke oils tend to be synthetic blends. You could try mixing a little castor oil into what you are currently using; though it won t run as clean.
He just needs pro kr2 like I said earlier.

lancepar

Original Poster:

1,115 posts

194 months

Tuesday 30th December 2025
quotequote all
craigthecoupe said:
Maybe try posting in biker banter and see if that gets you any help? i think any premix/2stroke chat here will be garden machinery based.thumbup
My mistake the original post was to vague and so Admin redirected it to Homes, Gardens and DIY.

I should have made it clear it was for a 2t motorcycle engine.

I'll try the suggestions already posted.

Can Admin repost to a Motorbike forum please.

Cheers
laugh