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Waynetod

349 decoke.

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Hi all. Can someone tell me if the back box on a 349 (year around 1980?) is the only part that needs a decoke? That flattened part of the exhaust under the tank, does that contain baffles too? How would both be done? Bike starts and idles great after a thorough carb clean and rebuild, but feels like the baffles are blocked on wide throttle openings. I've done the caustic soak and a blowtorch up it's back box, but I'm still having an issue when get on the power. 

Edited by Waynetod

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The bit under the tank is comprised of a perforated tube with packing round it. Cleaning and repacking is well worth doing. Cut a window in the back of the box so the repair doesn't show.

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Cut the back of both my 348 silencers open, packing was shot & full of old oil, i used a blow torch after removing packing and burnt the insides clean and dry then re-packed and then cut over size tin plates which i riveted on ?

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On 9/26/2020 at 11:12 AM, sparkieb said:

Cut the back of both my 348 silencers open, packing was shot & full of old oil, i used a blow torch after removing packing and burnt the insides clean and dry then re-packed and then cut over size tin plates which i riveted on ?

Was it running crap on wider throttle openings before you cut them open, and was it running better afterwards? 

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Was a non runner, it was all part of the restoration. But now its all finished it does run as sweet as a nut ?

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