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Post by 5twins on Nov 11, 2010 12:05:34 GMT -5
Your mufflers appear to be aftermarket Dunstall replicas, like these I ran when I 1st got my bike running ..... Honestly, if they are those mufflers, they're junk. I thought they were OK until I got a set of Mike's Commando mufflers. I mounted just one along with one of the old mufflers and started the bike. Boy, what a difference. The Dunstall rep sounded cheap and tinny, the Commando deep and throaty. I highly recommend them. I think they're one of the nicest mufflers made for the 650 at the moment.
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Post by teflon97239 on Nov 11, 2010 21:26:54 GMT -5
Mystery solved, louder rumble forthcoming for the price of a drill bit!
Leo, the reason I couldn't picture what you did with your Yamaha pipes is because mine are not! And 5twins, you hit it right on the nose. While you were posting your reply, I visited a local (non-dealer) shop where they actually ride and tinker with old TX/XS650's. Looking at a pic on my phone, the owner guesses Dunstalls, or replicas. No wonder it doesn't rumble!
Soooo, without stock pipes to preserve for posterity, the gloves are off. I'll start with small holes and keep drilling until there's some engine noise. Then a little bit more and call it good. Or maybe go buy something better.
Lesson learned? I can't buy a 35-year old scooter and assume anything is stock. Maybe those hand warmers in the grips are an off brand too?
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Post by 650leo on Nov 17, 2010 4:50:11 GMT -5
I put a set of Mike's 1.5 headpipes on my 75. They don't fit as wellas I hoped, but they are on. I got a set of Emgo short mufflers, 1.75 inlet with reducer sleeves. Wouldn't seal the muffler to the pipe. With some cutting and welding the leaks were much better. I cut the headpipes off just at the kickup on the end. This got the mufflers in the place I wanted them. I then used one of the reducer sleeves and a 2 inch piece of 1.75 pipe. Slid the sleeve on the pipe, the 1.75 pipe over the sleeve and welded the pipe the sleeve and 1.75 pipe together to seal the headpipe to the 1.75 inch pipe. This let the mufflers seal to the pipes much better but still had a few leaks. The clamps that came with the mufflers are kinda wimpy. The strap is thin and narrow with a 5/16 bolt. I have the mufflers I took of the Harley. The clamps are much better clamps. Wider, thicker and a 3/8 bolt. Where the ends of the clamp come together there is a curved piece to fill in the gap. With all this you can get the clamp much tighter and all around the muffler It seals the pipes very well no leaks. They might have worked with the mufflers and sleeves with out the added pipe I welded on. Didn't think of that till after the welding. I think if you are using mufflers with 1.75 inlets and you have some leakage you should try a set of the Harley clamps. I'll bet they will stop the leaks. They only come in 1.75 size. It would be nice if they came in more sizes.
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Post by hardway1969 on Dec 15, 2010 22:13:39 GMT -5
Those appear to be Dunstall replicas of some sort. I have seen them on Ebay and other sites. Check to see if the cone comes apart at the end. You might need to research them as some of these kinds of mufflers can be disassembled and baffle tubes removed. I am sure some veteran owners will chime in and tell you more.
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Post by teflon97239 on Jan 24, 2011 23:46:32 GMT -5
Thanks for all the suggestions and insight guys. Reporting back since I started this thread in the first place. I wasn't so much slacking on getting around to it as I was waiting for a few consecutive non-icy, non-rainy days. Rare around Portland in January.
Anyhow, they're Dunstalls. One piece units Hardway, so my only access was through the end of the tailpipe - with a drill.
Here's the cool part. I drilled one 1/4" hole in each baffle end plate and what a difference. It sounds really pleasing now, like a 650 again! The stock Dunstalls were just too civilized and restrained for my taste.
Aware that engines can "seem" to make more power when they sound beefier, I carefully evaluated performance beforehand, noting where the low end torque kicks in with specific gear selections along familiar routes, up hills, etc. Easily 500-750 rpm lower now in all instances. Not wanting to adjust or replace anything at the carb end, I was sensitive to any new hesitation, popping or pinging. Not a hint.
The holes I made are so far down inside that decorative "ray gun" looking end piece, you'd have to kneel and peer inside there to even notice.
So riding home tonight, I was thinking, "hmmm, if one hole is this good..." I guess if I drill too many, I can just tap and turn a screw in there to plug the final hole that makes it sound obnoxious, or flattens out the power curve.
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