Leaning toward a Yamaha Vino 125 - and question about engine breakin

 


Still researching..................thinking twice about the 50cc
chinese scooter route.

the 125cc chinese scooters lack the retro look of the 50cc ones. Seems
only the Yamaha offers more power in the retro-style. of course the
price is alot higher (twice).

OK question - Engine break in. One says baby it, the other says go all
out.

WTF? - who is full of it and who is correct?

thanks for any wisdom!
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the following in alt.scooter:



    Personally... Both

    My viewpoint... for the most part keep from full throttle extended
runs, but don't keep it mid throttle for the entire period.

    The main break-in (besides seating bearings) is that of the piston
rings. Until they (and the cylinder) break in, you risk blow-by... But
if you baby it only, you may not break in the full range... Strange
concept, since the piston shouldn't move any farther under full-throttle
than under half, but the inertial difference may make a small effect --
the rings may move inertially just a fraction more under full throttle.

    So... after the first hundred or so miles at mid-cruise level, do a
few /easy/ moves to full throttle for a short distance and back... and
later try a few hard accelerations (after the initial ring seating) to
work back pressure on the system.
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 Proper break in is as follows. Start the bike and let it warm up just
a minute or so. Start out by accelerating at around 1/4 throttle for
about 4 seconds, then decelerate at part throttle taking about 8
seconds to come back to a slow putt. Do that a few times. Then
accelerate at about 1/3 throttle for 4 sec. then decelerate for about
8, doing this a few times. Finally accelerate at about 1/2 throttle to
cruise speed taking around 8 seconds, (semi briskly) decelerate for
about 10-15 seconds. Do that a few times. The "deceleration mode" will
seem like it takes a long time, but do it right.

 The idea here is to "heat cycle" the engine without overstressing it.
This will seat the rings.

 Now go ride, but take it easy, don't get crazy. Don't go to WOT for at
least an hour of riding.

 Make sure when you are riding, you vary the throttle and don't just
ride for long periods at one steady speed.

 Change appropriat oil(s) as the manual suggests.

 

Bike Guy Joe wrote:

 

Dennis Lee Bieber wrote:


thanks!!

when you say full throttle - we are talking 5-minute spurts?

I'm already backsliding in the not made in China department. just ran
across a new retro-125cc for 800 bucks
1/3 the cost of a Yamaha and 1/4 that of a Vespa.

China = crap, but for that kind of money it may not be crap ;-/.

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