Shine a bright light in the end and look down inside. If you see wire mesh in there, you have spark arrestors. You can see mine in this photo.
Okay now I'm wondering if the square ones have cats in them? The exhaust on my bike doesn't smell very rotten-egg-like in comparison to my car. Although both the Terra & Strada sold in the US would have to have cats in them. I'm not sure about our local laws with bikes having to have cats as my KLX didn't yet a US KLX does. I am really curious to know the reasons for different cans!
We can assume therefore that square holes = no spark arrestor. It must be a compliance issue in the US that requires them. This topic seems to suggest that - http://www.thumpertalk.com/topic/141607-why-do-we-need-spark-arrestors/
With the exception of Coffee's Strada, the pattern is USA Terra = Round, everything else = Square. One possible explanation for the exception is they made a mistake in the factory, or they ran out of squares that day and decided to use a round set for Coffee's bike. Either way, Coffee has a better Strada than the rest of us, given the added spark arrestors. A collectors item for sure.
No.. I can tell why there might be some confusion based on what I typed - but I have round cans, have a TR650 Terra, and am in California USA.
Does not having spark arrestors limit where you can ride (ie, national parks, etc)? This question was asked on ADV and I was only able to give a partial answer. I know some parks out west require spark arrestors for two-strokes and quads, but do they for four-strokes? Technically the stock exhaust, Terra or Strada, meets all federal requirements. However, I distinctly recall someone in Washington State getting a citation for not having spark arrestors a few years ago. Anyone have any experience with this?
