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Discussion Starter #1
I have an 05 VTX 1300c with HK strippers on it and about 10100 mles on it. As far as I know it was rejetted by the previous owner. It has ran great until a few weeks ago. A riding buddy said I must be running rich as he smells unburnt fuel coming from the exhaust. I also get a small amount of decel pop here and there. It has been raining here in RI for the past 4 days and I haven't been on it in almost a week. I went to start it up today and had to choke it to keep running (although the outside temp was 82 today). Then after about 15-20 seconds of running in choke, I saw a small orange flame come from 1 of the pipes. Weird! Then it ran fine. Other symtoms include : Black exhaust usually on startup
Spark plugs have dark brown to black color
Decel pop here and there
Smell of raw fuel
when choked, it also runs rough. kind of sputters and pops
Any clues?
 

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I had a similar problem with my bike about a month ago....No flame but alot of popping an decel . Found the problem was a nearly plugged pilot jet from bad fuel . Not sure if thats your problem but its pretty easy to pop the tank off and drop the bowl to clean the jets out . Also check the air fuel screw sounds like your running rich and could use a quick adjustment , try tightening it a 1/4 turn and see if it makes it better .
 

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shock factor unrated
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also, the choke could be getting hung. sea foam carb cleaner is pretty good to run through your tank to help clean the carb. i'm sure some others will chime in with more ideas and things to check. good luck bro
 

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Discussion Starter #4
thanks for the great advice so far guys. After reading up, I'm going to the stealer to get some new spark plugs and change the oil. I also have to check the choke position. Thanks again for the advice. I will keep you posted as to how things are going.
 

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Dragon Slayer
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Do yourself a favor and stop using choke(fuel enrichener), and you will save the plugs. Be sure to check the "choke" cable, sometimes it may not go back in completely, causing a rich carb.
 

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C'MON THE HOOPS
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Skip the stealer for the plugs. You'll find them cheaper at the same auto store you get Seafoam at. You can go with the stock NGKs or use another like the champion RA8HC plugs I and some others are using. Around $2 ea, and no problems that I've come across.

For more economical, good quality parts just search the forums here for plugs, oil, filters, etc... you'll find all you ever wanted to know, and save a good deal of cash.
 

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Discussion Starter #7
Unfortunately, I couldn't find plugs or the oil filter at any auto parts store here in RI. But what a difference an oil change and new plugs can do. The heavy gas smell was reduced to what I was told "a huge difference". The decel pop was also reduced. A Harley expert noticed I was running a but rich and advised me to go down a size on the high end jet. I was thinking of going with a K&N filter instead of rejetting. I figured the extra air would lean it out. Does it make sense?
 

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K & N won't give any more air if you're running stock air box. The best way to "lean" out a bit is to adjust the A/F screw. Look in the stickies for carb adjustments, you won't have to open up carb, just adjust the air/fuel. Do yourself anothefavor, leave stock pilot & jet as is for now.
 

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Discussion Starter #9
K & N won't give any more air if you're running stock air box. The best way to "lean" out a bit is to adjust the A/F screw. Look in the stickies for carb adjustments, you won't have to open up carb, just adjust the air/fuel. Do yourself anothefavor, leave stock pilot & jet as is for now.
Thanks for the great tips and advice. I will try adjusting the carb today and let you know how things turn out. Thanks again!
 

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Thanks for the great tips and advice. I will try adjusting the carb today and let you know how things turn out. Thanks again!
:harder:
Sorry, misread your original post, didn't realize carb had been re-jetted, if at all possible get a hold of stock pilot and needle and start from there, you'll probably only have to adjust a/f at that point. I don't know what the numbers are for stock set-up but check out the scar mod sticky uit will be in there some where.
 

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Plugs are a bigger issue than the carb settings if fouled they won't burn the fuel properly.

now as far as the jetting the main jet really doesn't need to be as large as some think this is what I found out.
If you want the best top end you can get then a larger jet is mandatory but if you just want a nice smooth running machine you can go as low as a DJ 185
The needle position is more of a concern, with to low of a clip or shim position it will give you flat spots to high it will bog a bit with to much fuel and then run strong.
The pilot needs to be set correctly to keep from fouling the plugs or loading up at idle this is time consuming because it is a PITA to get to what you want to have is a idle set to 1000 or a bit higher to start with then blip the throttle if it drops below the 1000 setting then returns or dies then it is open to much
if when you blip the throttle again and it hangs up for a second then you are a tad lean and it would need to be opened a touch.
1/8th to 1/4 is a big adjustment on the pilot once you have it close.
after getting the pilot set correct then you can lower the idle a tad book recomends 900 +/- 50 rpm or something like that.
starting point for the pilot would be 2-2 1/4 turns open from lightly seated position.
 

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:harder:
Sorry, misread your original post, didn't realize carb had been re-jetted, if at all possible get a hold of stock pilot and needle and start from there, you'll probably only have to adjust a/f at that point. I don't know what the numbers are for stock set-up but check out the scar mod sticky uit will be in there some where.
I agree. Prolly not a need for bigger jets with a stock airbox.
black soot in the exhaust & black plugs = running rich.
P
 
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