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Replacement Carburettors.
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For TS250/1, ETZ 250 and ETZ 251
These are two alternatives to the BVF type fitted as standard.
The Amal Mk II
and
Mikuni VM
Amal Concentric Mk II - Type L2 - 903 - 303
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Throttle Slide
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Part 2928 No. 3
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Needle
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Type 2D1 - middle groove
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Needle Jet
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105
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Main Jet
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210
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Float Height
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Factory Set (nylon type float)
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Mikuni VM 32 SC
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Main Jet
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105
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Slow Running Jet
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30
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Needle
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SEP8 or 5FP17 - 3 (middle groove)
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Throttle Valve
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2.5
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Float Height
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27.3 mm
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Air Screw
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2 turns out
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The Mikuni carbs can be sourced from Suzuki T500 R, J, K or L and GT500 A.
It does, however, require slight modification.
-
Where the cab mouth engages the inlet stub the outer diameter needs reducing
by about 1/8
th
of an inch.
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Due to differing cable adjusters the MZ BVF top is used (screws straight on)
but does need a 1/8
th
inch washer between the spring and the carb top to prevent the slide lifting
too far and turning. (jamming the throttle wide open, don't ask!).
This resulted in crisper low speed response, stronger mid range and a slight
increase in top speed, the downside was fuel consumption increased by about 5
mpg.
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