Playing With Copper - 3G Fat Tire 4-Stroke Build

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Working on a new 4 stroker project and the damn muffler wont fit. What to do? No welder. I came up with a solution that I'm hoping holds together.
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If I'm not mistaken, that looks like the small Briggs cigar muffler. I don't recommend using that muffler on a HS, it's extremely restrictive above 5000RPM.

Better to use the larger Briggs cigar (the 4-7/5-8 version). You get great flow, good sound, and it's just restrictive enough to enhance torque due to backpressure.

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Edit: old video of my bike running, link: https://www.youtube.com/watch?v=MawTccZUpyE
 
I was looking at that muffler. Rated for 5+ HP. Before I make the final solder I might pick up the other muffler and an adapter. Is the other other muffler 1"? The one I used is 3/4 thread.
 
I ended up brazing the upper joints and used silver solder on all the lower joints. So far, so good. Dual 1/2 thread mufflers solved the high RPM restriction. Sounds awesome! Would I do it again, hell no.
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When I got the bike the owner had attempted to retrofit a rear engine mount. It might of worked it it was level and/or straight.
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Also found a wasted rear hub bearing and the typical grinding of the throttle grip pin.
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The owner was not happy about the engine mounting in the frame. A 415 Chain Link Pin makes a great throttle grip pin.
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Pedal Power back in action.
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First roadtest blues. Lost a nut.
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