Honda CRF300L/Rally MotoX Exhaust Noise Test 4K

Ask any enduro or older dual sport rider about the Honda CRF300L/Rally and they will tell you it's too heavy. They may have a point, even if you don't notice it as much when riding. One component which weighs a lot, in an inconvenient place on the bike is the exhaust system, and in particular the silencer/muffler/end can depending on where you are in the world!

In the UK, having a quiet exhaust on a trail bike is ideal, as the lanes are shared with other users, of which some groups are looking for opportunities to limit access for motorcycles. Loud pipes that scare livestock and intimidate other trail users are not great, and only strengthen the case for the trails to be shut.

Accordingly, whenever there is talk of exhaust replacement, one of the first questions is 'how loud is it'? The answers are entirely subjective and range from not too loud, to the ever helpful 'it sounds much better' (for what I always wonder!).

So, to this video, I have a MotoX exhaust from Thailand, and I want to know how loud it is, and more importantly, how load it is compared to the stock exhaust (see my other video)
The two tests I'm using are the ACU static rpm test and the 2 metre max test, and the technical descriptions of these can be found on:
[ Ссылка ]

I'm also aware that there are sometimes claims that new exhausts increase power, and though this can be shown on a Dyno, I don't have one and don't plan to get my bike on one, so this is a noise test only. If anyone has a Dyno and is near the Peak District, please let me know, and I'd be happy to do a video comparing the power of the two exhausts.

00:00 Introduction and setup
03:16 MotoX standard Tests Idle Test
04:13 MotoX standard Tests Static RPM Test
05:14 MotoX standard Tests FIM 2 Metre Max Test
07:37 Baffle Removal
09:29 End cap failure
09:44 MotoX Baffle removed FIM 2 Metre Max Test
10:54 MotoX Baffle removed Idle Test
11:54 MotoX Baffle removed Static RPM Test
13:04 Spark Arrestor Measurement
14:28 Results
15:50 Explanation of the differences, comparable sounds and Conclusion

If you don't want to watch the video (and let's face it, it's not of interest to everyone!), the results are:
Test: Stock/MotoX standard/MotoX Baffle removed
Idle: 72.6dB/69.1dB/72.0dB
Static RPM: 83.4dB/80.1dB/81.3dB
2m Max: 96.2dB/97.7dB/99.0dB

Thanks to Suzette Shipman who suggested it would be useful to explain dB's (decibels) to people who might not be familiar. I'll not go into the detailed explanation as it's a long time since I had to know it and it's probably not that useful to understand the mathematics if you understand the scale. Essentially it's a logarithmic scale which means that for an increase of 10dB the sound level doubles and this scales up so taking 70dB as a starting point, as this is a useful baseline, roughly equivalent to a vacuum cleaner or traffic.

80dB is twice as loud as 70dB
90dB is four times as loud as 70dB
100dB is eight times as loud as 70dB
110dB is sixteen times as loud as 70dB

For additional context, exposure to sound levels over 85dB for sustained periods (8h+) can cause permanent hearing loss. Sound levels of 90dB+ can cause damage after 30 minutes and levels of
120dB+ damage after 30 seconds.

The upper limit set by the ACU does vary but is around 112dB for racing and 105dB for track days (though lower limits can apply) Max noise for an enduro bike is 112dB and for a trials bike 100dB.

I hope this has been interesting and useful, and if it has, please like and subscribe.

See you next time!

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