1958 Moto Guzzi Cardellino
canuck750
canuck750
Alan Comfort
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Paul M
fastguzzidave
Andrew Nahum
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Rick Yamane
It depends more on the oil. In the olden days 2T oil was pretty primitive. It was customary to mix at 16 or 20:1. That was true right into the seventies.
Today I run Optimol 2T at 100:1 in all my 2T bikes. Been doing it for close to 20 years and I haven’t had to do any of my own topends since.
I do have a friend that was riding ISDT and ISDE. He had a factory ride on a Suzuki PE175 in the late 70’s. The team manager told him if he ran leaner than 40:1 he was taking the bike away. The reason was Suzuki ran a higher clearanced bearing than most manufacturers and they used more oil to cushion the bearings.
One thing most guys don’t think about is the effect on jetting. If you run less oil with the same jetting, you are richening the air-fuel mixture. Also keep in mind any oil being spewed out the pipe is doing nothing.
The richest oil mix we normally see anymore is 36:1.
As far as staring 2T engines, if the carb has a tickler, tickle it till it bleeds, then a bit more. Leave the throttle shut and kick it. Once it pops feed it some throttle. It shouldn’t need both choke and tickler. You’ll need to play around a bit to see what works best for your bike because they’re all a little different. If it is a hard starter and/or runs like it is loaded up you might want to pressure check the lower end. Crank seals are quite often bad on old bikes.
From: guzzi-...@googlegroups.com [mailto:guzzi-...@googlegroups.com]
On Behalf Of Andrew Nahum
I’m my Guzzino I use a modern high grade two-stroke synthetic (well I don’t really know if it’s high grade but it’s high cost). Anyway, I aim for 30:1 oil and no oiling problems over years.
I wouldn’t go less. I do always carry spark plugs and a spanner on any two-stroke but most spark plug changes take place for ritualistic reasons.
These little bikes are an absolute gas and I love mine. (See my licence plate). Good luck with yours.
Andrew
Any tips on the fuel / oil mix and starting procedures?
canuck750
Thanks for the advise and picture of the lovely Guzzino!
Andrew Nahum
never really dared try low oil ratios on my two-strokes because, as
Rick says more oil is needed if the clearances are higher - i.e. the
gaps. And even if the clearances on my bikes were not originally
manufactured loose, as sure as hell they are now. I'd never go below
30:1 on an antique. Maybe it's too much. It's just an act of faith.
Re starting - on all old bikes it's important to have a starting
procedure or 'drill' and do it, or refine it, each time. On my old
kickstart BMW, I tickle each carb for the count of 3 seconds, then
kick with throttle at 1/8th. In winter if it's cold I keep the tickler
down while I count 4. On the Guzzino I do pretty much the same as Rick
except that after a couple of kicks with throttle closed, which I hope
has drawn in the gas, I crack the throttle open 1/8th and hold it
there while kicking if it hasn't started.
If you have a sixth sense that it is over-rich by this time (always a
tricky one to call), open the throttle full and kick some more,
because that pulls more air than fuel through the motor at kicking
speeds and we are hoping to pull the mixture strength back down to
combustible. But it is a learning curve without doubt. That's partly
why I always like to have a plug spanner with me because you can pull
a plug to see if it looks wet, or smells of gas. If it looks dry, and
smells of nothing at all, then maybe the carb tickling wan't enough.
Good luck!
Andrew