Easy test for possible exhaust leak at pipe joints?
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Grand HDF Member
Joined: Jun 2017
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From: Near Yosemite
Easy test for possible exhaust leak at pipe joints?
Just had the bike dyno'd with a TTS tuner by a very reputable tuner. 22 SGS with a SE 447 torque cam, KW catless header, and TAB Bam Sticks. I still have a very slight decel pop occasionally, but maybe 3 times in 500 miles? Only when I get just a bit spirited with it like pulling out of a upsloped hair-pin in the twistys. So I want to eliminate any slight pipe joint leak as a possible culprit. What do you use? Incense or punk stick looking for the smoke to get sucked into the joint? I've tightened and retightened all the clamps twice now. MAYBE new clamps? Any other ideas to test them? I thought about a thin bead of something like orange high temp exhaust sealant around the OUTSIDE of the joints to see what happened. Like just enough to seal them, but can be cut off with a razor for slip-on or pipe removal. Any thoughts for a good test? 
Road Master
Joined: Mar 2012
Posts: 1,018
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From: Ohio
Just had the bike dyno'd with a TTS tuner by a very reputable tuner. 22 SGS with a SE 447 torque cam, KW catless header, and TAB Bam Sticks. I still have a very slight decel pop occasionally, but maybe 3 times in 500 miles? Only when I get just a bit spirited with it like pulling out of a upsloped hair-pin in the twistys. So I want to eliminate any slight pipe joint leak as a possible culprit. What do you use? Incense or punk stick looking for the smoke to get sucked into the joint? I've tightened and retightened all the clamps twice now. MAYBE new clamps? Any other ideas to test them? I thought about a thin bead of something like orange high temp exhaust sealant around the OUTSIDE of the joints to see what happened. Like just enough to seal them, but can be cut off with a razor for slip-on or pipe removal. Any thoughts for a good test?
But more than likely a small tweak of the MAP is needed. Two common places to make adjustments is closed throttle fuel, raise the AFR a touch in that table at operating temperature cells in the table. Or closed throttle spark. Raise the timing amount by a few degrees at operating temperature cells in the table.
It doesn't mean the tuner didn't do a good job. He just may not have experienced the load under conditions that you see on the road.
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