Do you need to rejet the carburetors if you remove the exhaust H-box? Honda CX500, GL500, CX650, GL650

The exhaust H-box is often removed due to the old one rusting out or being viewed as being unnecessary weight and complexity;

Do you need to rejet the carburetors if you remove the H-box on a Honda CX500, GL500, CX650, GL650?

Do you need to rejet the carbs if you do remove it?

Do you need to rejet the carburetors if you remove the H-box on a Honda CX500, GL500, CX650, GL650?

In general, no. You should not notice any difference – some say slight alteration in midrange power (power band moved slightly higher), some say no discernible change at all – if you remove the H-box and keep the stock carburetor jetting. That is assuming you don’t make other changes at the same time, such as installing pod filters in place of the stock airbox – which definitely does require a carburetor rejet.

Not convinced about replacing your one that’s full of holes? There’s sometimes some on eBay US.

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