Originally posted by tkhoo
what is that for and can I have the picture?? Thanks.
It's a plastic insert, for the carb. There are actually a few inlet hole sizes to choose from.
The restrictor as it's name suggest, it restricts the air flow into the engine.. making it more fuel efficient but loses some rpms though.
Those engines with a big bore carb, like the NS12, comes with this kind of air inlet restrictor.