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Flame thrower

Started by moonrunnah, June 28, 2013, 05:14:06 PM

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moonrunnah

June 28, 2013, 05:14:06 PM
My exhuast throws flames at around 1500 rpm and at red line and sometimes well holding a steady rpm. Any help??? Burnt valves????

Tryed posting this morning but doesn't look like it went through
When in doubt throttle out

movenon

#1
June 28, 2013, 06:04:42 PM
Quote from: moonrunnah on June 28, 2013, 05:14:06 PM
My exhuast throws flames at around 1500 rpm and at red line and sometimes well holding a steady rpm. Any help??? Burnt valves????

Tryed posting this morning but doesn't look like it went through

I would start with wanting to know how much compression I had. What do your plugs look like ? Have you checked ?
More information, ? Have you preformed any maintenance on your bike lately ? Other than the flames is it miss firing ? Smell fuel ? Exhaust smoking ?

Hard to digitally trouble shoot with out more information.
George
Life isn't about having the best, but about making the best of what you have...

1990 FJ 1200

moonrunnah

#2
June 28, 2013, 06:41:56 PM
Doesn't smell like gas last I did was replace the petcock and jet the carbs I haven't checked plugs yet ( haven't ran it much since I did the jets) I don't know what the compression is as I don't have a tester
When in doubt throttle out

FJmonkey

#3
June 28, 2013, 06:44:32 PM
Quote from: moonrunnah on June 28, 2013, 06:41:56 PM
Doesn't smell like gas last I did was replace the petcock and jet the carbs I haven't checked plugs yet ( haven't ran it much since I did the jets) I don't know what the compression is as I don't have a tester

Rejet the carbs? Did you need to rejet? What jets did you change from/to and why?
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

movenon

#4
June 28, 2013, 06:48:26 PM
Quote from: FJmonkey on June 28, 2013, 06:44:32 PM
Quote from: moonrunnah on June 28, 2013, 06:41:56 PM
Doesn't smell like gas last I did was replace the petcock and jet the carbs I haven't checked plugs yet ( haven't ran it much since I did the jets) I don't know what the compression is as I don't have a tester

Rejet the carbs? Did you need to rejet? What jets did you change from/to and why?

Event time line.. Did your problem start right after you worked on the carbs ?
George
Life isn't about having the best, but about making the best of what you have...

1990 FJ 1200

moonrunnah

#5
June 28, 2013, 06:50:57 PM
Uni pods and 4-1 d&d exhaust so I went up 10 percent to 125s for mains

It got worse it did it a redline when I would shift now it does it quite often probably from the bigger jets
When in doubt throttle out

movenon

#6
June 28, 2013, 07:01:50 PM
Quote from: moonrunnah on June 28, 2013, 06:50:57 PM
Uni pods and 4-1 d&d exhaust so I went up 10 percent to 125s for mains

It got worse it did it a redline when I would shift now it does it quite often probably from the bigger jets

If it started after you did the mods then my best guess, you messed something up in the carbs more than just the jetting.
Did you do a plug reading ?  Still recommend you do a compression check.
George
Life isn't about having the best, but about making the best of what you have...

1990 FJ 1200

FJmonkey

#7
June 28, 2013, 07:09:50 PM
Quote from: moonrunnah on June 28, 2013, 06:50:57 PM
Uni pods and 4-1 d&d exhaust so I went up 10 percent to 125s for mains

It got worse it did it a redline when I would shift now it does it quite often probably from the bigger jets

I switched to SupperTrapp slip-ons and UNI pods. I rejetted to #40 pilots and 112.5 mains, needles shimmed up, clip moved down one groove. I might be a tad lean but not far from a good setting. 125 might a tad much, not sure about 4/1 systems. What jets are you using? Differnet brands have differnet standard sizes.
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

oldktmdude

#8
June 28, 2013, 07:10:03 PM
Quote from: moonrunnah on June 28, 2013, 06:50:57 PM
Uni pods and 4-1 d&d exhaust so I went up 10 percent to 125s for mains

It got worse it did it a redline when I would shift now it does it quite often probably from the bigger jets
125's are probably about two sizes too big in my opinion. I've got similar mods to you and 117.5's seem about right. Also check that your header gaskets are sealing properly.
1985 FJ1100 x2 (1 sold)
2009 TDM 900
1980 Kawasaki Z1R Mk11 (sold and still regretting it)
1979 Kawasaki Z650 (sold)
1985 Suzuki GSXR 400 x2 (next project)
2001 KTM 520 exc (sold)
2004 GasGas Ec300
1981 Honda CB 900 F (sold)
1989 Kawasaki GPX 600 Adventure

moonrunnah

#9
June 28, 2013, 08:04:56 PM
The stock I believe are 125s and I was told ten percent but I will do test and go through my carbs again tomorrow thanks for the help
When in doubt throttle out

moonrunnah

#10
June 28, 2013, 08:13:29 PM
Quote from: moonrunnah on June 28, 2013, 08:04:56 PM
The stock I believe are 125s and I was told ten percent but I will do test and go through my carbs again tomorrow thanks for the help


I ment 112.5 for stock according to my factory manuel
When in doubt throttle out

FJmonkey

#11
June 28, 2013, 08:39:57 PM
Quote from: moonrunnah on June 28, 2013, 08:13:29 PM
Quote from: moonrunnah on June 28, 2013, 08:04:56 PM
The stock I believe are 125s and I was told ten percent but I will do test and go through my carbs again tomorrow thanks for the help


I ment 112.5 for stock according to my factory manuel

I will need to check what I have then next time I pull the carbs... If they are 112.5 then it may be why I think I am a little rich. I will check the plugs first though...
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

movenon

#12
June 28, 2013, 09:08:25 PM
Quote from: FJmonkey on June 28, 2013, 08:39:57 PM
Quote from: moonrunnah on June 28, 2013, 08:13:29 PM
Quote from: moonrunnah on June 28, 2013, 08:04:56 PM
The stock I believe are 125s and I was told ten percent but I will do test and go through my carbs again tomorrow thanks for the help


I ment 112.5 for stock according to my factory manuel

I will need to check what I have then next time I pull the carbs... If they are 112.5 then it may be why I think I am a little rich. I will check the plugs first though...

Mine are 112.5. The 1990 stock jets were leaned down to 110. I just kicked it up a little because the new laced gas that we are running seems to be technically lean and most FJ's like a bit more fuel.  My needle position is down on the 4th grove from the top. Runs fine at 2950 feet elevation.
George
Life isn't about having the best, but about making the best of what you have...

1990 FJ 1200

fj1289

#13
June 29, 2013, 01:15:26 PM
POST A VIDEO!   Bet it makes tailgaters back off!

moonrunnah

#14
July 01, 2013, 04:11:29 AM
Quote from: fj1289 on June 29, 2013, 01:15:26 PM
POST A VIDEO!   Bet it makes tailgaters back off!



Haha yea it does ill try to get a video this week but no promises
When in doubt throttle out
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