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Hello All,
First let me say that I don't own a VTX 1300, but my neighbor does and he is in need of help. I own a Vstar 1100 and have been successful in tuning my carbs after an air kit and aftermarket exhaust was added so he has reached out to me since he has never done anything like this.

My neighbor owns a 2006 VTX 1300C and he purchased a set of Vance & Hines Big Shot pipes and K&N filter from a local motorcycle shop and they supposedly tuned the carb after the modifications. His bike sounded and ran like crap at low speeds. It fouled the plugs after only 100 miles or so and I'm pretty sure the bike is running way too rich. On the top end, the bike seems to run just fine. He has taken it back to this motorcycle shop 4 times now and they still can't get it right. His shop installed a Dynojet 190 main, and DJ needle clipped in the 3rd position.

Today my neighbor and I performed the Scar method on his bike. I replaced the DJ 190 main with the stock 195, replaced the DJ needle with the stock needle, clipped the 'tit' in half, shimmed the needle with 1 Radio Shack shim, verified that the low speed jet was a 55, and I turned the A/F screw out 2 1/2 turns out from lightly seated. We also replaced all the spark plugs with a new set. I also checked and torqued all 4 exhaust manifold bolts to 17lbs. The exhaust gaskets are the originals and the bike has about 7000 miles on it currently.

We took our bikes out for a 50 mile test run and his bike seemed to be performing much better. After the ride we pulled the plugs and there appears to be light soot on spark plugs so I would say they are on there way to becoming carbon fouled which makes me believe it is still running rich. He also noted that the exhaust still exhibited what he described as 'snap, crackle, and pop'.

Any suggestions on where we should go from here?


Thank You,
 

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if the shop didn't have a load control dyno that was the first mistake. I have had nothing but good results using a DJ kit.
All I could recommend is what I would use for a DJ kit which would be main as a DJ195 needle depends on what you want to use for pilot jet stock go to the 4th clip one size bigger use the 3th clip and mixture screw you do by ear
 

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Does he still have the PAIR valve on? That will also cause your described "snap, crackle and pop" :wink:

Hopefully Scar will find this thread and step in with his expertise.
 
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