2 stroke ratio for Guzzinos

[jerry atric]

Can anyone advise on a good 2t ratio using semi synthetic oil to suit the Cardellino please? Thanks.

[Dave Knaack]

I use motul 2stroke oil 40:1

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On Aug 27, 2021, at 5:38 AM, jerry atric <baconsl...@gmail.com> wrote:

Can anyone advise on a good 2t ratio using semi synthetic oil to suit the Cardellino please? Thanks.

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[Andrew Nahum]

I use any good modern two-stroke oil at 30:1. 

I reckon that though oils have improved the engine is still a 1940s design. 

On 27 Aug 2021, at 13:32, Dave Knaack <fastgu...@gmail.com> wrote:

I use motul 2stroke oil 40:1

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[Dave Knaack]

30:1 is definitely on the safe side. I thought the cardellino had a rotary intake like the zigolo???  If so, guzzi was the first to recommend 40:1. 

Sent from my iPhone

On Aug 27, 2021, at 7:42 AM, Andrew Nahum <andrew...@gmail.com> wrote:

I use any good modern two-stroke oil at 30:1. 

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[Andrew Nahum]

Yes Guzzinos pioneered that rotary intake through a hollow crankshaft like Cardellinos and Zigolos. 

Mine has an oil measuring cup on bottom of tank filler cap. May be wrong but I thought original Guzzino ratio in 1949 was 20:1. I’ll check. 

It doesn’t oil plugs on 30:1 which I reckon is the main thing. 

On 27 Aug 2021, at 14:47, Dave Knaack <fastgu...@gmail.com> wrote:

30:1 is definitely on the safe side. I thought the cardellino had a rotary intake like the zigolo???  If so, guzzi was the first to recommend 40:1. 

To view this discussion on the web visit https://groups.google.com/d/msgid/guzzi-singles/E7DEB5E1-1AA6-4FF1-8FDF-B0D7AEC07D69%40gmail.com.

[Paul Compton]

Just about every old 2 stroke engine will run much better with a
modern oil and a much leaner oil/fuel mix. 50:1 is a reasonable
figure.

Starting is improved and plug fouling reduced if not almost eliminated.

You may well need to re-jet though as the oil was displacing fuel in the mix.

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Paul Compton
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[Andrew Nahum]

It’s just a gamble isn’t it? We have no idea how long the engines will last with that lean oil mix and we won’t use them enough to find out. I suppose if it doesn’t seize it’s probably ok. I remember Saab introduced a 50:1 mix in the 1960s but with their own oil.


> On 27 Aug 2021, at 15:38, Paul Compton <paul.c...@gmail.com> wrote:
>
> Just about every old 2 stroke engine will run much better with a

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[jerry atric]

Thanks for the answers, guys. I thought I had read 30:1 but it sure smokes at that, hence my question.

[Rick Yamane]

Anecdotal experience is I've been running Optimol 2T at 100:1 for over 20 years. No bad bearings, no top ends. It goes in all my 2T's so I don't have to have more than three gas jugs around. I don't own anything as old, my earliest 2T is a 1968 Sachs Enduro. Most of the running time would be MXing a Sachs powered Penton/KTM.
Before that I would use Oilzall or Maxima 927 at 40:1.

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[Mac Dennis]

Many people running around on old light weight 2T bikes. Have you been to a Giro lately?
Most that I have talk to run modern synthetics at 40:1 and some 50:1. I use 40:1 in my Guzzino, Benelli, Motobi and Kreidler.

Mac

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[Andrew Nahum]

> I have not done giros on the Guzzino although I have enjoyed some equivalent runs organised by the English cyclemotor club on wonderful back roads.
> But a bigger test is that I used it for many miles for an entire winter and most of a year for commuting through central London. Yes I was probably crazy. Though it was only 5 miles each way - but back in the dark - it was a test of the quality of the Guzzino. I even fitted a solid state regulator to stop the alternator popping the light bulbs when I revved the nuts off it to stay with the traffic flow - cos slower is often more dangerous.
> I’m not asserting that a 30:1 oil ratio is perfect. It works for me so why should I experiment with less oil and risk a rebuild, a cylinder hone to clean the fused-on aluminium off the bore, new rings etc etc? I possibly have more miles experience on a Guzzino than any occasional giro rider !! Or maybe even anyone on this list. But I don’t know the answers !!!
>
> I attach pictures. The Guzzino is a brilliant design that should have gone round the world like the Honda 50 did later. When I stop with it in biker places people are drawn to it magically by its charm and ignore megabucks Harleys and “Broughs”.
>
> PS
> I used to use outboard motor oil because it is formulated to mop up water and combustion toxins. However. I have found in an agricultural store sealed snap cap capsules of 100 mls synthetic two-stroke oil for Stihl chainsaws or similar so that’s what I’m using now so I don’t have to measure oil out into little bottles.
>

[jerry atric]

I think commuting 5 miles each way through London qualifies you for a medal. I did it back in the '70s on a Triumph twin and that was hairy enough then as an immortal 20 year old! 

[jerry atric]

I have to admit that I own this Cardellino through accident of sorts. Its not something that interests me, so if anyone is in the market for one, I'm the bloke to ask🙂

[briana...@gmail.com]

Where are you in the UK?

[jerry atric]

Apologies, I hadn't been back to the forum. I'm in Wiltshire.