For our purposes carb syncing is the process of setting the individual carb's butterfly valves to open at the same time and same amount. The effect is to provide the same amount of air (and thus fuel) giving us the most power and smoothest operation. This is a crucial step in tuning any multi-cylinder engine, but especially highly tuned, high-performance ones like the V4 Interceptor.
It's a simple concept with the only difficult part being actually getting to the set screws. That's where the Motion Pro 90-degree Hex Driver comes into play.
It's a simple concept with the only difficult part being actually getting to the set screws. That's where the Motion Pro 90-degree Hex Driver comes into play.
(Below) In the case of the VFR, I snap on a 7mm socket to fit the adjuster screw. A straight blade screwdriver socket will also fit but is much more difficult to actually use. The reason is that we'll need to fumble around in the dark under the carb set to find the adjuster. The socket is just a more positive engagement. The tool doesn't hold the socket very well (seems to be common with Motion Pro socket tools) so I wrap a bit of teflon tape on the base to help out.
With the engine warmed and idle set at about 1200 RPM, and using number two carb as a (non-adjustable) base, adjust the other three to match. I do this at idle and at a steady higher RPM, about 3000. When I'm happy with the adjustments, shut the engine down, allow it to cool a bit and remove/plug the vacuum ports. There's some good video tutorials on YouTube for more tips. Job done!
With the engine warmed and idle set at about 1200 RPM, and using number two carb as a (non-adjustable) base, adjust the other three to match. I do this at idle and at a steady higher RPM, about 3000. When I'm happy with the adjustments, shut the engine down, allow it to cool a bit and remove/plug the vacuum ports. There's some good video tutorials on YouTube for more tips. Job done!
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