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Two stroke dilemma
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Bobbie
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July 9, 2019 - 12:29 pm
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Whilst impatiently awaiting my DVLA registration for my D3, and having gazed hopelessly at the inanimate but lovely thing far too often. I thought I could pass some time by finding something new to worry about.

Well it didn’t take long and here it is:   When I first acquired the bike I cleaned out the tank and carburettor and treated it to some fresh unleaded and the best fully synthetic I could find... It started wonderfully for a trip round my back garden. However, someone said I should only use semi synthetic oil in the mix. So, like a tight fisted genius, and not wanting to waist my oil, I decided to buy some pure mineral stuff and mix them together...

...BUT, I have just read somewhere this is a ver bad idea.!!!

... is this really true? In which case I’ve bought two lots of unusable oil and should now get the desired semi synthetic.

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SpacedMarine
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July 9, 2019 - 2:17 pm
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Personally I wouldn't worry too much.We were discussing the other day that back in the day some people just used plain old engine oil.Why not just use the fuel up and use one bottle at a time?

When you've used up what you have just buy some semi synthetic but I'm sure it's been run on way worse in its lifetime 😂

What's 7/16 in mm again?

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Bola
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July 9, 2019 - 4:08 pm
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What semi synthetic oil is everyone using?

I had Castrol Power clean burn with Shell V-Power. (Wanted the biggest bag in the cylinder)

 

Bike not running perfect so will try something new next time!

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Bobbie
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July 9, 2019 - 4:10 pm
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SpacedMarine said
Personally I wouldn't worry too much.We were discussing the other day that back in the day some people just used plain old engine oil.Why not just use the fuel up and use one bottle at a time?

When you've used up what you have just buy some semi synthetic but I'm sure it's been run on way worse in its lifetime 😂  

Sensible idea, I suppose just a little bit left in the tank of one type won’t be too harmful with the next filling using different oil.

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Jon
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July 9, 2019 - 8:12 pm
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For two stroke oil I go to my local agricultural dealer and buy horticultural rock oil two stroke oil, I am a gardener and use it in my machinery, I can’t remember the last I’m time I had to clean a plug, my Bantam loves the stuff as well, and it is less than £4 per litre and even less if you get a 5 litre can.

1954 D3 plunger

1969 BSA B25 Starfire

1975 Kawasaki Z1B

2004 BMW F650GS

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nickjaxe
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July 11, 2019 - 12:23 pm
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Bad idea...mineral and any synthetic turn to goo.

Dont ask me how I know...it will block your filter at the least.

Unless you using the bike daily...stick to semi synthetic...it protects the internals against corrosion better than fully.

Nick.

My Bantam video              https://www.you.....jpOFmzRZRI

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Bobbie
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July 11, 2019 - 3:09 pm
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nickjaxe said
Bad idea...mineral and any synthetic turn to goo.
Dont ask me how I know...it will block your filter at the least.
Unless you using the bike daily...stick to semi synthetic...it protects the internals against corrosion better than fully.
Nick.  

Yes... your advice seems consistent with what I'd heard... Thanks for confirming

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cocorico
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July 11, 2019 - 3:10 pm
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nickjaxe said
Bad idea...mineral and any synthetic turn to goo.

Disagree, I've never had a problem mixing oils.

1956 D3 running, lights to sort. 7 other bikes in the Barn, 6 runners (when I get time!) and a still in progress Morini 250

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nickjaxe
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July 11, 2019 - 4:21 pm
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What mineral with semi?

My Bantam video              https://www.you.....jpOFmzRZRI

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cocorico
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July 12, 2019 - 12:41 pm
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Yes. Not a thing I'd do regularly (I buy whatever is cheap in the supermarket), especially as so little oil is used when you mix your fuel, so it's not as if I'm mixing it in a 5 litre can anyway.

"According to Mobil Oil, it should be fine to mix oils. This manufacturer states it would be unlikely anything bad would happen, such as a gel-forming from an interaction of the chemicals (a common fear), because the oils are compatible with each other. Many oils are a blend of natural and synthetic oils."Sep 30, 2018
 
This is after 50 years of using various 2 stroke machinery without problems  except for one seizure on an MZ with pump injection when I ran out of oil! Don't forget the Bantam is a pre WW2 (ie 80 years) designed engine with pretty slack tolerances, made for low grade fuel.
 
Bola - I use 95 unleaded in my D3, generally with about 3% semi-synthetic 2T (unless I only have mineral!) plus a dash of paraffin to 'reduce' the quality of the fuel back towards what it was built for. I don't believe a bigger 'bang' makes any appreciable difference to perceived power! I don't think you'll have any bad effects from using fully-synth (apart from in the wallet).

1956 D3 running, lights to sort. 7 other bikes in the Barn, 6 runners (when I get time!) and a still in progress Morini 250

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nickjaxe
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July 12, 2019 - 1:14 pm
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But did mobile say you can just mix mineral with mineral...I see no prob with that...or did they say their mineral oil will mix with semi-synthetic and synthetic?

My Bantam video              https://www.you.....jpOFmzRZRI

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cocorico
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July 12, 2019 - 6:35 pm
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cocorico said  ..Many oils are a blend of natural and synthetic oils."Sep 30, 2018

 

You just don't read what's there, do you Nick?

1956 D3 running, lights to sort. 7 other bikes in the Barn, 6 runners (when I get time!) and a still in progress Morini 250

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nickjaxe
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July 12, 2019 - 8:44 pm
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I do apologize.

My Bantam video              https://www.you.....jpOFmzRZRI

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chickensoup
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July 14, 2019 - 9:11 am
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Hi Bobbie,

Returning back to your post, I agree it's a nightmare out there for the new Bantam owner. We have all been there though. There are so many different types and grades of oils to choose from, and everyone has their own opinion and personal choice. Back in the day there was only one option. " Castrol TT " and it had a picture of Barry Sheen on his Suzuki on the bottle too.

I have tried them all over the last four years and my only complaint is the exhaust fumes from fully synthetic doesn't smell right. I have also topped my tank up with petrol mixed fully synthetic, when the tank was half filled with petrol mixed semi synthetic, and had no bad experiences. 

For the last couple of years, I have been using a 2 stroke oil from Halfords, which has been designed for Lawn Mowers and Garden equipment. I have not had any issues with the oil and the exhaust fumes smell like what a 2 stroke engine should smell like. The last bottle I bought was £ 5.00 a litre, good for 5 gallons at 20 to 1

There lies your next dilemma !!!! 

What ratio, petrol to oil should you be using. I use 20 to 1 with said lawnmower oil and all seems great. I have read on the forum that some Bantam owners are trying a 30/35 to 1 ratio because they can do because they are using fully synthetic oil  ?????

This week I purchased a new toy. A 1966 D7. Reading the official BSA handbook raises another question. It tells you to use 20 to 1 ratio, then it tells you to use 16 to 1 ratio....AGGHHHH...

1950 BSA D1 Plunger   242 UYW

1966 BSA D7  LBF 62 D

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chickensoup
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July 14, 2019 - 9:19 am
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20190714_083822.jpg

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1950 BSA D1 Plunger   242 UYW

1966 BSA D7  LBF 62 D

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cocorico
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July 14, 2019 - 9:56 am
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chickensoup said
Returning back to your post, I agree it's a nightmare out there for the new Bantam owner...   ...It tells you to use 20 to 1 ratio, then it tells you to use 16 to 1 ratio....AGGHHHH...  

Quite right, best to start with 'ordinary' oils, I think. As for what mixture you use, I tend to go for the 'wisp of blue when warmed up' mix. ie start with whatever is recommended and reduce a bit if it's smoky, or vice versa.

1956 D3 running, lights to sort. 7 other bikes in the Barn, 6 runners (when I get time!) and a still in progress Morini 250

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nickjaxe
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July 14, 2019 - 11:47 am
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Far as I know Graham...semi and fully will mix fine...its just the mineral thats the prob.

Supprised the green party and green peace have not had mineral oil in 2 strokes banned by now...

My Bantam video              https://www.you.....jpOFmzRZRI

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SpacedMarine
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July 14, 2019 - 4:50 pm
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nickjaxe said
Far as I know Graham...semi and fully will mix fine...its just the mineral thats the prob.
Supprised the green party and green peace have not had mineral oil in 2 strokes banned by now...  

They have.2 strokes are practically banned for road use apart from the odd scooter.The major manufacturers pretty much only make 4 strokes these days.Even the "fast" learner bikes such as the aprilia and Yamaha's are all 4 stroke.Even the old 125cc gp class is now 4 stroke singles.250cc I think???

It's only nostalgic folk like us who use them these days 😂😂😂

What's 7/16 in mm again?

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two-stroke
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July 14, 2019 - 9:07 pm
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chickensoup said

This week I purchased a new toy. A 1966 D7. Reading the official BSA handbook raises another question. It tells you to use 20 to 1 ratio, then it tells you to use 16 to 1 ratio....AGGHHHH...

look close depends on oil typ

castrol 2-stroke 16 to 1

castrol xxl 20 to 1

etc rite for the time & all wrong with modern oil!

nickjaxe said
Far as I know Graham...semi and fully will mix fine...its just the mineral thats the prob.

minral a problem? semi is a mix of minral & sinth were is the problem?

u must be thinking of caster oil castrol r wich u cant mix with minral semi or sinth

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