VFR750R MR7 Carbs
RC30 [Std.] VD Carbs
Use MR7 tray & [recommended] airbox gauze.
ITG or similar foam filter highly recommended.
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HRC produced a TT-F1 jet kit, comprising of replacement vacuum pistons (commonly referred to as "slides"), emulsion tubes, jet needles, jet needle shims, and pilot [slow] jets.
Essential for street when aiming for maximum performance, and [highly recommended] for race use, a foam "dome" filter should be used. These are available from ITG, at approximately £175 [2017]. The HRC kit manual suggests running the carbs open, and in 1991 supplemented the kit instructions to include grinding away the separating ribs on the carb tray, drilling the sides of the tray, and opening up the venturi for increased flow. [See below]
NL0 kit bikes were often fitted with Keihin FCR39, and factory supported NL0B bikes with TR38s. Full factory RVFs were later fitted with magnesium TR carbs, up to 43mm.
Gains from the FCR39s are negligable on NL0 spec motors, but certainly perform well at very high rpm.
Use MR7 tray & [recommended] airbox gauze.
ITG or similar foam filter highly recommended.
Good for top-end & over-rev.
Generally loses bottom-end & mid-range.
Factory carbs were produced up to 43mm