Refueling routine. It's been a long time

General scooter chat, any scooter related non technical info.
mick1
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Thu Feb 22, 2018 7:56 pm

spannerman wrote:
Thu Feb 22, 2018 5:43 pm
Quick question here , Why is everyone quoting 3%, standard! lambretta,s run on 4%
Those quoting probably don't run standard Lambretta's.

Not all standard Lambrettas were quoted at 4%.

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HxPaul
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Thu Feb 22, 2018 7:58 pm

I cant speak for others,but I run at 3 per cent because its better at that rate.Oil has changed a lot since we used 4 per cent.I used to run mine at 4 per cent when the petrol was 4 star,plus we used to use mineral oil.

onthelam
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Fri Feb 23, 2018 2:09 am

spannerman wrote:
Thu Feb 22, 2018 5:43 pm
Quick question here , Why is everyone quoting 3%, standard! lambretta,s run on 4%
I believe the answer is in the oil. Back in the day Lambrettas were designed so one could rock up at any petrol/gas station and mix varying weights of mineral oil with the fuel. They recommended 4% .

Now we have semi and fully synthetic 2-stroke specific oils which have better additives and lubricity. So if using them we can reduce to 3%.

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coaster
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Fri Feb 23, 2018 9:20 am

spannerman wrote:
Thu Feb 22, 2018 5:43 pm
Quick question here , Why is everyone quoting 3%, standard! lambretta,s run on 4%
That's because modern oils are much better that what was available back then, Vespa were using 2%.

Some kits still recommend 4% but I'm yet to be convinced that is down to any scientific research personally.

mick1
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Fri Feb 23, 2018 2:13 pm

The primary use of the oil is to lubricate the crank. With vespas have the induction directly over the crank, the crank is directly lubricated, hence the 2%. With Lambrettas having modern, improved, cranks and better quality cylinders, pistons and 2 stroke oil then running 2% is achievable. I think some wrote about trying at 1%

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rosscla
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Fri Feb 23, 2018 3:13 pm

mick1 wrote:
Fri Feb 23, 2018 2:13 pm
The primary use of the oil is to lubricate the crank. With vespas have the induction directly over the crank, the crank is directly lubricated, hence the 2%. With Lambrettas having modern, improved, cranks and better quality cylinders, pistons and 2 stroke oil then running 2% is achievable. I think some wrote about trying at 1%
That'd be a brave man on an expensive cylinder kit... :o
"Our dilemma is that we hate change and love it at the same time; what we really want is for things to remain the same but get better."

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spannerman
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Fri Feb 23, 2018 8:57 pm

Well if you read most aftermarket kits they still quote 4%, probably to safe-guard themselves .though, personally I would stick to 4% on an iron barrel and 3% on nicasil lined ,yes oil is better these days ,so there is an argument either way, if your happy to drop your oil ratio on an expensive kit , so be it !

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HxPaul
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Fri Feb 23, 2018 9:21 pm

I've got a Casa 210 on one scooter and a Casa 185 on the other,I've done thousands of miles on each without trouble.

paul d
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Sat Feb 24, 2018 1:47 am

Great topic for anyone entering the 2 stroke world. I ran my t5 172 on 1% fully synth for too long by mistake. At the time I was adding 1% to the tank and expecting the autolube to add the other 2%. I got lazy and was in the habit of waiting for the oil level to appear in the sight glass, then I'd top up the oil tank. When, after an age the oil didn't reduce to the sight glass and I looked into the oil tank to see it still full I knew I'd messed up. The oil pump had stopped working. The scooter ran fine on the 1% for a few hundred miles but within 600 miles my oil seals had completely wore out with that sickening high tick over and smell of gearoil being burnt! On a t5 which is as modern a traditional scooter gets, 1% isn't enough.

onthelam
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Sat Feb 24, 2018 5:54 am

Maybe one could add that at 4% oil then only 96% is fuel. If the bike is running a tad lean then dropping the oil to 3% means 97% is fuel.
Although nothing is ever simple.

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