Vs 1400 Front Cylinder Backfire - Motorcycle-Journal Forums

INTRUDER ALL MINE · 07-04-2005, 12:25 AM

Hello everyone, I am new to the site and have one thing to say INTRUDER'S ROCK!!!!, Ok now that I got that out I have a real question...
I have a 93 vs 1400 intruder (my baby) that started running rough and then quit running on the front cylinder... I pulled the carbs apart and cleaned them both thourghly (the front carb had a red Powder like substance in it???)
put them back together and put the bike back together, ran it and it now would fire on both cylinders but got a case of nasty backfire from the front cylinder so I tore the carb back apart and cleaned it again even though it was spotless. and I took the slide and diaphram out and replaced them because the diaphram was shot... thought for sure that was the problem but when I got the bike back together it did the same thing This all took place in about a years time due to time and money constraints as well as the winter season so the bike did sit for a while but anyways I am now stuck wondering if it could be a sticky valve or what ???? Please help!!!

oldgeezer · 07-04-2005, 07:20 AM

How many miles on the bike? Have you checked the plugs. You could have a fouled plug. Generally, if it is backfiring out the exhaust that is a sign that the carb is running too rich. Have there been any exhaust modifications on the bike? Also, have you changed your breather filter? It could be starved for air. Next time you have the tank off, flush it out just for good measure.

INTRUDER ALL MINE · 07-04-2005, 12:30 PM

The bike has 31,000 miles, I am running cobra exhaust (since it was new) full not just slip ons... I changed the plugs last year, pulled them a couple of days ago and cleaned them, the one I am having problems with had allot of carbon on it. I cleaned and oiled the air filters but don't know whrere the braeather filter is so any help there would be good...
Thank you
Intruder all mine

INTRUDER ALL MINE · 07-04-2005, 12:33 PM

I should add that it pops and backfires at an idle and at low throttle locations. when I open it up it seems to be a bit better

blackie1491 · 07-04-2005, 01:18 PM

The adding of pipes, if done without re-jetting can creat problems.
Low and medium range are the areas where manufactures meet EPA controls. When doing exchaust pipes, jetting and aircleaner should also be considered.
If you read thru some posts here re intake fuel injection and exchaust pipes, you will begin to grasp the effects of each. Where for FI, remapping or management system s/b done, for carberation rejetting is done.
We have some good people here who will give you assistance. Local shops are, in most cases, able to explain it and offer options to you.
Welcome to the forum. Good luck

oldgeezer · 07-04-2005, 07:20 PM

When you pulled the front plug, if it was wet with fuel, your carb is running rich. If it is dry carbon, it sounds like a ring problem as the combustion chamber is burning oil. I reckon I'd check the compression on the cylinder to rule out a ring problem.

INTRUDER ALL MINE · 07-28-2005, 12:36 PM

well I got it running with some new plugs! Go figure. stressin over that (the plugs I took out only had about 150 mi on them) but then it sat for a very long time... Like I said I got it going but when I ride for a while then shut it off it waits a moment then gives a big loud pop out of the exhaust so NOW WHAT????
help...

oldgeezer · 07-28-2005, 12:57 PM

Ride the bike for 20 minutes or so then park it and pull the plugs. That will tell you if the bike is running rich or lean. I suspect it is still running a little rich. Does it backfire out the exhaust when you are riding. For example, when you are accelerating and shift gears, does it backfire while the clutch is engaged?

INTRUDER ALL MINE · 07-28-2005, 01:12 PM

nope just when I shut it off

stp1971 · 07-28-2005, 08:37 PM

loading up the carb maybe???? Dumping extra fuel in it and then when you shut it off it has to burn that last bit of gas.... maybe check those plugs like O.G. said,,if they are wet then richness could very well be the problem,, it might be dumping just enough extra fuel into it so that the heat causes it to maybe explode in the pipes,,,hmmmmm,,,just a guess,,,what do you think O.G.?????

Danr · 07-28-2005, 09:34 PM

Check your header bolts, for any loose ones, look at the pipe where it come out of motor to see if there is any exhaust leaks.

07-04-2005, 12:25 AM	#1 (permalink)
INTRUDER ALL MINE Newbie Joined: Jul 2005 Posts: 8	Vs 1400 Front Cylinder Backfire Hello everyone, I am new to the site and have one thing to say INTRUDER'S ROCK!!!!, Ok now that I got that out I have a real question... I have a 93 vs 1400 intruder (my baby) that started running rough and then quit running on the front cylinder... I pulled the carbs apart and cleaned them both thourghly (the front carb had a red Powder like substance in it???) put them back together and put the bike back together, ran it and it now would fire on both cylinders but got a case of nasty backfire from the front cylinder so I tore the carb back apart and cleaned it again even though it was spotless. and I took the slide and diaphram out and replaced them because the diaphram was shot... thought for sure that was the problem but when I got the bike back together it did the same thing This all took place in about a years time due to time and money constraints as well as the winter season so the bike did sit for a while but anyways I am now stuck wondering if it could be a sticky valve or what ???? Please help!!!

07-04-2005, 07:20 AM	#2 (permalink)
oldgeezer Handlebar Consultant Joined: Aug 2004 Location: Texas Posts: 646	How many miles on the bike? Have you checked the plugs. You could have a fouled plug. Generally, if it is backfiring out the exhaust that is a sign that the carb is running too rich. Have there been any exhaust modifications on the bike? Also, have you changed your breather filter? It could be starved for air. Next time you have the tank off, flush it out just for good measure. __________________ Oh, he's very popular Ed. The sportos, the motorheads, geeks, sluts, bloods, wastoids, dweebies, d!ckheads--they all adore him. They think he's a righteous dude.

07-04-2005, 07:20 PM	#6 (permalink)
oldgeezer Handlebar Consultant Joined: Aug 2004 Location: Texas Posts: 646	When you pulled the front plug, if it was wet with fuel, your carb is running rich. If it is dry carbon, it sounds like a ring problem as the combustion chamber is burning oil. I reckon I'd check the compression on the cylinder to rule out a ring problem. __________________ Oh, he's very popular Ed. The sportos, the motorheads, geeks, sluts, bloods, wastoids, dweebies, d!ckheads--they all adore him. They think he's a righteous dude.

07-28-2005, 12:57 PM	#8 (permalink)
oldgeezer Handlebar Consultant Joined: Aug 2004 Location: Texas Posts: 646	Ride the bike for 20 minutes or so then park it and pull the plugs. That will tell you if the bike is running rich or lean. I suspect it is still running a little rich. Does it backfire out the exhaust when you are riding. For example, when you are accelerating and shift gears, does it backfire while the clutch is engaged? __________________ Oh, he's very popular Ed. The sportos, the motorheads, geeks, sluts, bloods, wastoids, dweebies, d!ckheads--they all adore him. They think he's a righteous dude.

07-28-2005, 08:37 PM	#10 (permalink)
stp1971 May 2007 Member of the month Joined: Mar 2005 Bike: 2004 Suzuki Intruder 1500LC / 2005 Suzuki DL650 V-Strom Location: Douglasville, Georgia Posts: 7,833	loading up the carb maybe???? Dumping extra fuel in it and then when you shut it off it has to burn that last bit of gas.... maybe check those plugs like O.G. said,,if they are wet then richness could very well be the problem,, it might be dumping just enough extra fuel into it so that the heat causes it to maybe explode in the pipes,,,hmmmmm,,,just a guess,,,what do you think O.G.????? __________________ Biketoberfest 2006 flashback courtesy of Intimid8er: "Like you knew damn well you shouldn't eat something like that, but all be damned to hell, you were gonna eat it!" __________________

07-04-2005, 12:30 PM	#3 (permalink)
INTRUDER ALL MINE Newbie Joined: Jul 2005 Posts: 8	The bike has 31,000 miles, I am running cobra exhaust (since it was new) full not just slip ons... I changed the plugs last year, pulled them a couple of days ago and cleaned them, the one I am having problems with had allot of carbon on it. I cleaned and oiled the air filters but don't know whrere the braeather filter is so any help there would be good... Thank you Intruder all mine

07-04-2005, 12:33 PM	#4 (permalink)
INTRUDER ALL MINE Newbie Joined: Jul 2005 Posts: 8	I should add that it pops and backfires at an idle and at low throttle locations. when I open it up it seems to be a bit better

07-04-2005, 01:18 PM	#5 (permalink)
blackie1491 I took the All Bran Challenge Joined: Jun 2005 Bike: C50SE Location: Aldergrove, B.C., Canada Posts: 7,332	The adding of pipes, if done without re-jetting can creat problems. Low and medium range are the areas where manufactures meet EPA controls. When doing exchaust pipes, jetting and aircleaner should also be considered. If you read thru some posts here re intake fuel injection and exchaust pipes, you will begin to grasp the effects of each. Where for FI, remapping or management system s/b done, for carberation rejetting is done. We have some good people here who will give you assistance. Local shops are, in most cases, able to explain it and offer options to you. Welcome to the forum. Good luck

07-28-2005, 12:36 PM	#7 (permalink)
INTRUDER ALL MINE Newbie Joined: Jul 2005 Posts: 8	well I got it running with some new plugs! Go figure. stressin over that (the plugs I took out only had about 150 mi on them) but then it sat for a very long time... Like I said I got it going but when I ride for a while then shut it off it waits a moment then gives a big loud pop out of the exhaust so NOW WHAT???? help...

07-28-2005, 01:12 PM	#9 (permalink)
INTRUDER ALL MINE Newbie Joined: Jul 2005 Posts: 8	nope just when I shut it off

07-28-2005, 09:34 PM	#11 (permalink)
Danr Sit speling cheker Joined: May 2005 Posts: 1,616	Header flange bolts Check your header bolts, for any loose ones, look at the pipe where it come out of motor to see if there is any exhaust leaks.

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