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Each injector is sequentially fired depending on the requirements of the engine at any given time, with ignition being adjusted depending on throttle position and rpm.
Standard, the RC45 fuels very well. Even when fitted with a race silencer it copes well, with very few problems.
There are very few modifications that can be made to the standard airbox. The favourite is the replacement of the standard Honda paper air filter. As far as we know at this time though, there are no after-market companies making one, so it's down to a bit of do it yourself.
Filter foam can be purchased though Piper-X in the UK. This allows you to cut out the standard Honda paper element and replace it with the new foam. The main benefit of this modification is the filter can now be regularly cleaned rather than having to be replaced. The RC45 as standard also runs slightly rich thought the rev range, so a new foam filter helps reduce this and should add a little HP.
The RC45 does not come fitted with a pressurised air box as standard. However HRC made a number of kits, each being an evolution of the previous one. Unfortunately these are quite hard to fit to a stock RC45 for a number of reasons, which is covered in the HRC Racing Kit Manuals.
Above graph shows a stock engined RC45 fitted with a 1996 HRC twin can race system with a HRC ram air kit (blue) compared to the standard air box set up (red).
