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Hello,
This is m first post

I have a VTX 1300R and was made in 2005 in the USA and do I have a problem ?, he bike has Cobra pipes fitted ad the carb re jetted and the bike runs fine but on deceleration it pops ( Not a backfire) , This was all fitted to bike before I bought it, did the bike have a cat fitted ? as It spent 5 years in the USA before export to the UK ?

Any advice appreciated.
 

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The popping is *usually* caused by a lean condition or leaky exhaust gaskets. Try turning the air screw (need the D socket) out a bit. For the exhaust, the cobra pipes have a thinner flange than stock so the acorn nuts bottom out on the stud before the flange. Try a washer or 2 under the nut or change to open nuts. Good luck..
 

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Let us know what you find.
 

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Welcome aboard from Sunny So Calif......

THe popping is normally fresh air getting into hot exhaust gasses...
Check the flange & Gasket. As said above the Acorn nuts bottom out on thinner after market flanges.
Change them or add washers..
Do the PAIR mod (remove smog system, it puts air in exhaust).

Adjust A/F screw to about 2 turns out from lightly seated.. (Need "D tool for special "D" headed screw)
GlensVTXGarage has them, Also a permanent one that is super great for any tuning...
http://www.glensvtxgarage.com/





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Welcome from Green Bay, Wisconsin. Check to see if the pair valves have been removed, if not order block off plates and do the pair valve mod, super easy to do it takes about 30 mins. to do it. Have a great day, ride safe.
Perry
 

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Welcome.
Add flat washers as explained above under the acorn nuts , only one under each acorn nut but be carefull not to break the studs off as they are only about 1/4".
Par valve has nothing to do with performance including backfire on decel. Removing it cleans up the looks of the engine and makes it easier to work on when doing a valve adjustment , also removing it eliminates the gurgling sound in the exhaust. When removing the par valve do not just plug the hoses or cap the covers, that makes a real gooey oiley watery mess above the reeds and that is not good leaking back down into the engine, the best way is to add the block off plates.

Donut/Doug
 

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Welcome to the VTXOA from the southeast corner of NC.
 
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