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I just introduced my 10 year old son to the world of ICE motorcycles with a 2017 SSR 125cc pit bike after his brief training period on a Razor MX650 in our yard etc. I would like to take him on trail rides etc but our forests get drier than a popcorn fart in the summer. If you even think about riding anything with an internal combustion engine and no spark arrestor out there you'll be strung up on the nearest tree!

#1Is there an aftermarket muffler that fits the existing pipe with an approved spark arrestor?

#2Are there any bark buster sets that work on the stock bars?

 #3 I see there are versions of this bike with the bigger wheels (17F/14R?), can these swap straight on the existing forks and swingarm? Down the road when he grows another foot and a half taller (probably within about 6 months) it might help the bike continue to fit him?

 #4 I ride in the local sand dunes regularly and hope he can join me. Is there a flag mount that works good on these pit bikes or do I need to fab my own?

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Questions 1-3 I think are great questions. I would love to know as well.

Not saying question 4 is bad, but I think you are likely correct...Probably this is an item that can be fabricated fairly easily.

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I think I've figured out a solution to the spark arrestor part, it's stock can is well packed but straight through without any kind of baffles so as quiet as it gets without redesigning it. $15 Spark arrestor screen kit (for bigger bikes), I had to compress the mesh cone a bit to fit inside the muffler core tube but it fits perfect on the tip end. Tip is a plumbing part from Home Depot for $3.78 plus tax, just needed to mark and drill the four rivet holes to match up with the muffler. I'm sure you could put any kind of SS or carbon steel mesh in there and it would work equally well but you wouldn't have the "official" sticker to prove it complies with standards. Planning on taking the bike out tomorrow and we'll see how it sounds/works.
before:1462139-6a5d312fc7e18464372145ede1387809

taken apart:1462142-3391392a299f43c801e16754417e29dc

Screen and cap:1462143-361053b2923d4e81386560107e39347b

test fit: 1462146-013d410304afac7bcde9644fbaafad1c

assembled and installed: 1462149-75bd32865b769879b41b1569f1f4888d

(cross posted from ADV: https://advrider.com/f/threads/the-pit-bike-thread.1253295/page-2#post-37386422)

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5 hours ago, DirtyErnie said:

Took the SSR out to the dunes yesterday and even at full throttle the muffler tip worked fine. No restriction/backpressure problems. :)

Awesome!  Great job.  If those pictures were bigger, it would be even better.

Pretty sweet to make it work out, and come together.  I might look at doing the same thing.  Since, you have laid the ground work.  Thanks!

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1 hour ago, Explorer1987Nate said:

Awesome!  Great job.  If those pictures were bigger, it would be even better.

Pretty sweet to make it work out, and come together.  I might look at doing the same thing.  Since, you have laid the ground work.  Thanks!

Yeah, I'm too lazy to repost the whole thing again. ;) I pretty much just copy/pasted from ADV. If you follow the link to the ADV post the thubnails pics open to full size pics.

Youtube video of Son learning to ride SSR125 in the sand

Edited by DirtyErnie
added video link
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Made a flag mount quick and sloppy last night and tested today. Welds look like crap and a few things I would've done differently if it weren't a rush job but it worked fine as-is. 

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After our dune trip I had to work on a couple of things on the SSR, bottom steering head bearings are toast. Good news is top and bottom bearings are the same so swapped the good bearings to the loaded side until I can get replacements and greased the hell out of them. Muffler came loose again, plan to put a big hose clamp around the muffler in front of the mounting clamp it can't work itself backwards off of the pipe. I also put fender washers on the muffler mount bolt on either side of the muffler clamp/strap that holds it to the frame. That alone seems may have tightened the clamp pressure on the muffler. I moved the flag mount back a few inches more to make it easier getting on/off the bike without kicking the flag. I welded a big washer that fits on the muffler bolt to keep it from turning side to side as it could potentially do with just the hose clamps holding it. Much happier with the mount now. :)20190520_150703.jpg.82872b1a03f1a35a04f8a38b32a0d13d.jpg

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