Keihin 41mm FCR carburetors

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Bought a set Keihin carburetors on Ebay from an YZF750 superbike.
This setup was 4 in a row so had to modify a lot on it.
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Here made the brace and connecting rod to the other side.
Plugged the open fuel lines and acceleration fuel pipes.
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Raw milled aluminum for the manifolds.
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Both acceleration pumps connected on each side for better response instead of a fuel line to both sides.
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Aluminum soldered with Alutite. A special soldering system without the expensive TIG welding. Just an open flame 380 degrees celcius and a scratch pin.
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The raw hand milling to make the flow nice and easy going for the air/fuel mixture. Had a lot to do because the inside size was 35 mm and had to go to 41 mm.
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Made the inside smooth  and outside polished.
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Other side of the manifold.
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Fitting the parts into the bike for all sizes and little changes.
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Nice to see these stacks :-)
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The carburetors are fitted with a hose of 50 mm.
Made some rings onto the carburetors to get to the 50 mm size of the manifolds.
And then to connect them with a hose clamp
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Sync pipes and NOS foggers fitted in the manifold.
Next to make is an airfilter adapter that fits on the stacks.
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Fitted 4 K&N filters for better airflow and to keep the engine free from contamination.
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Bought 4 adjustable slow air jets to make tuning easier.

Made a video of the first run. Click on the picture for an impression.
I like the rattling :P Open stacks produce more power but not reliable to standard road use.
K&N filters were installed for that.
This first run was a base setup off the bench. So everything had to be tuned a lot.
That took a lot of time to get it right.

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