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| Batavus Encarwi Carburetors |
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| This is an illustration of the types of Encarwi-Bing
carburetors found on the Batavus Laura M48 engine. If you find errors either
in the text or content please email me with the details. It's involvement
and input from fellow Batavus owners that will make these pages a great
source of information for others. Click on photos to enlarge. WARNING:
These modifications are experimental. I take no responsibility in the accuracy
or damage this information or modification may cause to you Bat. |
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Updated: 6/19/01
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The first experiment in trying to gain more performance
from your Batavus should be to take the air filter off the engine and test
drive it. In most cases the air filter is the number one 'restriction'
to the performance of the engine, and this goes for any brand of moped
on the market. If the engine can't breath, all the jetting in the world
won't make a difference. K&N realized this and has marketed a better
air filter to solve this problem. I don't endorse running your moped continuously
without an air filter, but to do it as a test shouldn't damage the engine.
I found a UNI foam filter, UP-4200 pod filter, that fit the carburetor
at the local motorcycle shop. If anyone can track down a K&N filter
that will fit between the carburetor and kick stand frame let me know.
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UNI foam air filter
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There are three types of carburetors and two types of intakes used
on the Batavus. Identifying which one you have will help you decide which
route you can take to achieve a performance gain.
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| From left to right: S 23, S 8 A, and S 22/25. |
S 23, 20 MPH version
This carburetor uses a #52 jet for break-in and a #50 jet thereafter. The
back of the carburetor measures 8mm (.312") and the front of the venturi
measures 11mm (.437"). It is teamed with an intake manifold that has a
brass bushing sleeve in it. This bushing sleeve measures 8mm (.312") on
the inside.
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| S 23 carburetor. |
Intake with brass bushing. |
S 8 A, 25 MPH version
This carburetor uses a #54 jet for break-in and a #52 jet thereafter. The
back of the carburetor measures 8mm (.312") and the front of the venturi
measures 11mm (.437"). It is teamed with an intake manifold that measures
11mm (.437") on the inside.
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S 8 A carburetor.
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11mm intake manifold. |
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