Low rumble sound when opening throttle

[arpiggies]

Hello Maddiedog and Mel46.

Enjoy reading your posts greatly. New PCX owner here and I have a straightforward question as a scooter newbie. I realize this is not a "performance" bike by any means, but it's got great torque and initial acceleration which I love. One question though. When opening the throttle either starting from a stopped position, or merely accelerating a bit once already at a good speed, the engine or exhaust makes an extremely low and consistent rumble sound. Is this the normal sound of the PCX? It's almost a governed sound as if the bike is being held back from insufficient fuel injection or air. Is this sound normal then, or perhaps it's just me, as I would think an open throttle would exhibit a higher frequency sound than this.

Thanks so much!

[kramnala58]

I will take a stab at answering this ...

Is it a bit of the "throaty" sound? Mine does the same, and I like it. It seemed to increase when I replaced the breather with an aftermarket canister type one. I would rather have a rumbling sound that a higher pitched whining one.

By the way, welcome to the forums.

[Mel46]

I can't say if that is normal or not. Ours is extremely quiet when we start it, though I do hear a low rumble. Still, since I have a Burgman 400, it is hard to hear the PCX once the Burgman is started.

[arpiggies]

Thanks for the responses.

"Throaty" rumble sound is indeed the best descriptor. Glad to hear it is not uncommon.