06 Fe550 won't idle, backfiring

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jonny333

Joined May 2012

15 Posts | 0+

Boulder CO

Discussion Starter
• Jul 5, 2014

• #1

I have a 2006 Fe550 that has been stored since last year. When put up last year it was running great and I even took it out on the road a few times over the winter with no problems. Getting ready for riding season I have cleaned carb, replaced plug, changed air filter and checked for intake leaks. The bike is running very rough at idle with choke on. It will not idle with choke off and tends to only do good at high rpms, but as soon as you release throttle it backfires much more than normal and dies if you do not keep revving engine. The power in the low rpms is terrible almost non existent, but begins to pull hard past a certain point. It seems like it is fouling the plug, but examining plug I see clean dry plug, it is a little reddish in color. I have also examined the valve springs thinking one may have broken but they all seem to be in good shape.

I would appreciate any input you may have on my problem.

Thanks

 

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nosense290

Joined May 2014

45 Posts | 0+

Norway

• Jul 6, 2014

• #2

Sounds like you have to lean mixture. Try giving it more fuel/air

Ketil

 

berger

Joined Apr 2002

3K Posts | 11+

Phoenix Arizona

• Jul 6, 2014

• #3

Pull the mixture screw out of the bottom of the carb. Inspect it for a missing or damaged washer and o-ring seal. Either of these are very easy to drop or misplace. If the o-ring is missing or damaged the bike will run unbelievably lean.

If that checks OK. Do another thorough cleaning of all the jets and air bleeds.

 

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Reactions: 1 person

J

jonny333

Joined May 2012

15 Posts | 0+

Boulder CO

Discussion Starter
• Jul 6, 2014

• #4

Pulled the mixture screw out and I don't see an o ring. Just the long screw and spring. Where would the o ring be?

 

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nosense290

Joined May 2014

45 Posts | 0+

Norway

• Jul 6, 2014

• #5

The o ring should be on the screw as well

first o ring and then spring

 

Last edited: Jul 6, 2014

J

jonny333

Joined May 2012

15 Posts | 0+

Boulder CO

Discussion Starter
• Jul 6, 2014

• #6

Okay, so I will start with getting an o ring for this, any certain type or size?

 

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toivias

Joined Sep 2013

93 Posts | 5+

Silesia, Poland

• Jul 6, 2014

• #7

oring probably stayed at its place inside the carb. Take very small screwdriver and try to take it out.

 

berger

Joined Apr 2002

3K Posts | 11+

Phoenix Arizona

• Jul 6, 2014

• #8

You have the screw,spring,washer then o-ring. The o-ring and washer are very tiny. You can check up in the carb body, it might be stuck there. If you removed the screw with the carb mounted it may have fallen off towards the starter. Have a look around. Again, it is very small. Finding a new one? Good luck. You may need to buy a new screw, they make some very nice aftermarket ones. Just make sure it comes with the o-ring included.

 

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Andrewzzz

Joined Mar 2014

18 Posts | 0+

UK, ESSEX

• Jul 7, 2014

• #9

You can get these o rings no problem, I got myself few when I lost it first time on my good old Yamaha WR450 ;-) Since then I always remembered to look after the o-ring when cleaning the carb. You can either order it from the berg dealer or yamaha or get nice alloy fuel screw and it will come with one (but good to have few spare o rings!).

 

J

jonny333

Joined May 2012

15 Posts | 0+

Boulder CO

Discussion Starter
• Jul 21, 2014

• #10

Well, I ordered Taffys carb kit and it is night and day, bike is idling not backfiring, still tuning it in but it looks to have solved the problem.

On another note, in my test runs I am seeing a good amount of oil leak from the side of the headcover where compression release mounts to it. Does anyone know what this is caused by?

Thanks for the help

 

bushmechanic

Joined Jun 2007

4K Posts | 1K+

south east WA Australia

• Jul 21, 2014

• #11

could be the o ring on the manual decomp shaft

sometimes one of the rocker cover bolts starts letting oil out along its threads into the spark plug cavity, also sometimes valve lash inspection caps (on top) and the rocker arm end caps (on the RH side)

 

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Reactions: 1 person

J

jonny333

Joined May 2012

15 Posts | 0+

Boulder CO

Discussion Starter
• Jul 21, 2014

• #12

Its definitely coming out of the front rocker cover on the right side, and it seems like it is vibrating much more than it should be. Seems to be tight when I try to tighten the allen head.

 

bushmechanic

Joined Jun 2007

4K Posts | 1K+

south east WA Australia

• Jul 21, 2014

• #13

if its not the shaft o ring you could degrease the area and put bog over the leak .. might work

I would take the whole cover off and find out what the issue is.

 

Taffy

Joined Nov 2001

17K Posts | 774+

Ely, England

• Jul 21, 2014

• #14

jonny333 said:

Well, I ordered Taffys carb kit and it is night and day, bike is idling not backfiring, still tuning it in but it looks to have solved the problem.

Thanks for the help

Click to expand...

glad to hear it, let us know what settings you settle on Jonny?

regards

Taffy

 

J

jonny333

Joined May 2012

15 Posts | 0+

Boulder CO

Discussion Starter
• Jul 27, 2014

• #15

It was the O-Rings on the rocker covers, after I replaced those the oil leak has stopped.

Thanks for the help.