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Secondary Air; Wheel And Tyres Specifications - Derbi GP1 125-250 c.c. Workshop Manual

Gp1 125-250 c.c..
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Table of Contents
W
HEELS AND TYRES
SPECIFICATIONS
Front wheel rim
Rear wheel rim
Front tyre
Rear tyre
Tyre pressure front wheel (cold)
Tyre pressure rear wheel (cold)
Tyre pressure rear/front wheel (driver and
passenger). (cold)
N.B.
CHECK AND ADJUST TYRE PRESSURE WITH TYRES AT AM-
BIENT TEMPERATURE. ADJUST PRESSURE ACCORDING TO
THE WEIGHT OF THE RIDER AND ACCESSORIES.
S
S
ECONDARY AIR
ECONDARY AIR
The working principie of the SAS for Leader 125 ce engines is
entirely similar to the SAS employed on 2-stroke engines.
The main differences are the following:
Secondary air enters directly into the exhaust duct on the
cylinder head, instead of entering through the exhaust pipe
as in two-stroke engines.
The reed valve found on 2-stroke engines is here replaced by
a membrane. The unit, indicated by an arrow in the figure, is
provided with a cut-off connected to the vacuum inlet on the
intake manifold to shut air intake during deceleraron, so to
prevent detonations in the silencer.
Air is sucked in through hole «A" and flowing through the
first filter is directed towards hole «B".
12
DESC. / QUANTITY
Aluminium alloy
In light alloy
120 / 70 x 14"
120 / 60 x 14"
1,9 bar
2,0 bar
2,0 / 2.2 bar

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Gp1 125 c.c.Gp1 250 c.c.

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