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Running on 3 cylinders

  • Thread starter Thread starter the_journeyman
  • Start date Start date
T

the_journeyman

Guest
Ok, it's me again...

So, after reassembling the bodywork on my bike, I went out for a shakedown run. Everything felt fine. I was extremely low on fuel, so with the bike seemed to not run right, I thought it was because it was fuel starved.

Filled up, took off, grabbed some throttle, same lack luster response. Thinking maybe it just needed a minute to get the carbs filled back up with gas I rode on, maybe 3 or 4 miles. Problem still there, so I checked the header. Sure enough, #4 was only warm, not even close to hot.

Two or three nights ago, I took it for a ride before putting all the bodywork on and it was fine. Kinda makes the think it's not a fuel problem, else I would have noticed then since I hadn't touch the carbs since before that ride.

Hooked a multimeter to the #4 plug wire & got readings, just it was changing so fast, I couldn't actually read the numbers coming up. It appears there is fire coming down the plug wire.

#1 appears to be just fine too, so that should eliminate the coil.

After a 10 minute ride, I could put my bare hand on the #4 header pipe. Water sizzled on the other three.

Where should I check, what should I check & how should I check it?

Thanks!

JM
 
Good plugs? Spark plug caps sometimes crap out as well. NGK's are about $5 each and work well.
 
Yep!

Yep!

I've experienced the same problem a couple of times. Each and every time it was a carburator problem; nothing else. I tried every single thing I could think of to fix it but ended up taking off the carbs and giving them a thorough cleaning every time.....which fixed it every time. Maybe, there's a better answer; I hope so.
 
I do hope so, I JUST re-worked the carbs. I'll pick up replacement plugs to be sure. I have a hard time believing that the carbs altered themselves 48 or so hours AFTER the bike was running fine and I had touched nothing but bodywork ~

JM
 
Will do Chef, gotta put tires on the cage tomorrow, so I'll be doing plenty of garage work ~

JM
 
Congratulations...you now have what Triumph referes to as a "Speed Triple"......:-D
But seriously, folks....sounds like a carb issue to me as well. I've seen the symptoms before. Check the pilot jet on that carb, as well as the float needle (might be stuck in the housing).
 
Captainkirk said:
Congratulations...you now have what Triumph referes to as a "Speed Triple"......:-D
But seriously, folks....sounds like a carb issue to me as well. I've seen the symptoms before. Check the pilot jet on that carb, as well as the float needle (might be stuck in the housing).
Click to expand...

I lay my money on #4 carb as well.
You may have a partially blocked pilot jet. Sometimes after a backfire, the crap will dislodge and the engine will run ok. Once the bike sits again, the obstruction finds it's way back across the passage.
Bite the bullet and re-clean that carb.
 
49er said:
I lay my money on #4 carb as well.
You may have a partially blocked pilot jet. Sometimes after a backfire, the crap will dislodge and the engine will run ok. Once the bike sits again, the obstruction finds it's way back across the passage.
Bite the bullet and re-clean that carb.
Click to expand...
This guy knows his sh!t!!
Respect bro! :-D
 
Ok, in looking at the carb (not disassembled yet) there is gas in the float bowl, I'll give an update in a bit, going to switch the plugs around just to be sure.

On a side note, the carb does seem suspect because the plug wasn't wet & reeking of gas when I removed it. That sounds like fuel never got there in the 1st place ~

JM
 
Ok, I swapped the #1 & #4 plugs... the results? My GS is possessed.

It only ran on #2 & #3 so maybe the plugs are suspect, but possibly not the only problem. I'll replace those today and see what happens.

Since the problem spread, there's a problem with #4 plug. However, after switching the plugs back to the original location, the problem was STILL in #4. When I pulled the plugs after swapping them, they both were wet with fuel.

I'll check back in after I replace the plugs ~

JM
 
New plugs, still cold on #4.

However, after draining the #4 bowl, I pulled it off with the carbs still in place & hooked up to the tank. Float valve is working properly. Popped the rubber plug off of the pilot jet, got a little fuel from there too. Reassembled #4, started it and everything seems to be working.

I'll just not be able to understand why ~

JM
 
You cleared out some gunk that was in your pilot ciruit. I hope it doesn't return.
 
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