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2006 FE450 carb jetting

R

RickCJ7

Joined Jan 2011
24 Posts | 1+
I just picked up a 450 and after puting a few miles on it I've noticed a flat/hesitation/sputter spot around 1/8-1/4 throttle. Got it in the dirt and noticed it hard to maintain smooth throttle in the rough stuff, very jerky.

Starts easy and pulls hard, gets 60+ mpg DS it.

I did notice if I blip the throttle fast in nuetral or riding it will stall.
Any jetting ideas to help it out? I did try adjusting the idle screw in and out, didn't notice much differance.
1 other thing does it have a throttle stop/limiter in it?
 
try adjusting the fuel screw under the carb plus or minus half a turn. this should do it. failing that, raise the needle up one place.

go into my web site, i do a jetting kit if you want to take it further?

regards

Taffy
 
So I want to richen it a little? I have the air screw out from where it was, I should go in some.

I'll have to get a flexible screw driver or extended air screw so I can adjust easier.

Does it have throttle stop!! I hear some have a spacer you can remove to get full throttle?


Do you ship to the US and what would your jet kit cost me?
 
RickCJ7 said:
So I want to richen it a little? I have the air screw out from where it was, I should go in some.

I'll have to get a flexible screw driver or extended air screw so I can adjust easier.

Does it have throttle stop!! I hear some have a spacer you can remove to get full throttle?

Do you ship to the US and what would your jet kit cost me?
Click to expand...

Well I did say 'EITHER' way and so in is leaner and out is richer. you could have a rich 'stumble' as you boys say it.

a Pilot Screw is a good idea but only needed for a few seconds and then redundant for the rest of its life. its not an air screw, that is something else BTW.

the stop is under the black cover on the right of the carb and easy enough to remove but there is no real point. maximum air is reached 2mm before the stop is reached and pulling the needle even further out of the way does nothing at all. the manufacturer leaves as much needle in as he dare so as to spread the wear of the needle all down the atomiser tube. that way it lasts years unlike dell orto who did as you say and then the bikes are shyte after 6-months because the needle wore the ET oval.....

£120 and $25 for a PS. $10 to post.

regards

Taffy
 
I have a 04 FE 450 Runs great

I live a sea level and ride to 2500ft level

FCR-MX39

Main Jet 180
Jet Needle OBDVR
Idle Jet 40
Needle position 6th clip from top
Mixture screw 2 turns
 
c337b said:
I have a 04 FE 450 Runs great

I live a sea level and ride to 2500ft level

FCR-MX39

Main Jet 180
Jet Needle OBDVR
Idle Jet 40
Needle position 6th clip from top
Mixture screw 2 turns
Click to expand...

Thats what the manual says for mine except for a 178 main.
I thought it felt like a lean stumble but I will try turning it in to see if that helps.
 
Still not right! fuel screw didn't help tried it leaner and richer. Back to 2 turns out.
Did the o ring mod to the accel pump, helped a little, i think the pump is weak?!?
Its an 06 with very low hours, could the pump be weak? from sitting.
Is there any reason to jet the carb? haven't changed any thing just trying to get rid of the bog.
I'm thinking next step is to try a new pump.

My buddies KTM 530 lifts the front wheel right off idle, mine will stall.
 
If it's been sitting for awhile, you probably need to clean or replace the pilot jet.
Take the pilot jet out, hold it up to light- you should be able to see through it. If not, carb cleaner followed by compressed air usually works. Repeat the process till you can see a nice, clean round light.
 
It starts and idles fine, just bogs when you blip the throttle.
Turning the fuel screw in and out didn't help nor did turning the accelerator pump screw.
 
Have the Husy torn apart and the ac pump and timing look good, I have the fuel tank and air filter boot off looking into the back of the carb, when you blip the throttle, it feels like the fuel is pushing out for a brief moment.
Does anyone have any ideas, I'm getting fed up with this.

Would valves out of adjustment cause this??? Its got 40 hrs now.
 
Have you tried raising the needle 1 notch? My '05 FE550 will do the same thing when using a smaller pilot jet - 40/45/48. Mine came from the factory with an OBDVT needle and I went to an OBDVR needle then finally to a Yamaha needle - NCVR - part #5TA-14916-VR-00. My 550 has the best off-idle response with a #52 or 55 pilot jet. You may want to check the accelerator pump but then I have mine backed almost all the way off.
 
OK I'll try raising the needle 1 notch to the 5th from the top.

Is this something common for a new bike?
 
When I bought my FE550 it was almost new (20 hrs) and I spent some time fooling around with the carb to smooth out the idle/off idle transision and to reduce the abruptness. When I got the bike it had a 55 pilot jet in it (likely installed by the dealer) and everthing else stock. The first Husaberg I owned ('96 FE501) I purchased brand new and I did a bit of fooling around at first with that carb to get it to run and start to my satisfaction. I'm not sure I've ever left any bike carb completely as it came.
 
How can I tell if the acc pump is squirting enough fuel?
Looking in the carb and I blip the throttle it just misses the slide and shots a steady stream and then tapers off to a dribble in 2-3 seconds. I see some posts that the ac pump shoots a 6' stream, I don't think mine comes close to that. Its an 06 with 40 hrs. would it be more likely the ac diaphram is weak?
I just dont know what it should pump like.

My buddy dropped his 530 KTM off for some work, his has no bog. At least I'll be able to see what a good pump puts out.
 
it should pump into the plate static. the downdraught when riding will take it down and underneath the slide. it needs to smash into the slide otherwise it'll never burn in its droplet state.

you want an squirt that starts the moment you touch the throttle.

I'm sorry but the DVT needle doesn't need a 52 or 55PJ. it may well need it with the original 100PAJ but not when set correctly.

try the PS out at 2-3 turns and see if that doesn't cure it. lift the needle as well.

possibly check the TPS against the recommended figures.

also tight tappets can cause a cough and stall which is similar or close.

regards

Taffy
 
Checked the ac pump on my buddies 530, it pumps about the same amount of fuel but shorter duration.
His does not bog at all when you blip it full throttle.

I'm leaning towards intake valve starting to get too tight. What do you think?
How do you check TPS? I'll try a search.
 
Taffy said:
it should pump into the plate static. the downdraught when riding will take it down and underneath the slide. it needs to smash into the slide otherwise it'll never burn in its droplet state.
Click to expand...

This advice goes against what most everyone else recommends, namely that the fuel squirt should just miss the bottom of the slide as it lifts up.
 
RickCJ7 said:
Checked the ac pump on my buddies 530, it pumps about the same amount of fuel but shorter duration.
His does not bog at all or blow back thru the carb when you blip it full throttle.
Click to expand...

Ideally the fuel squirt should be very short at about one second or less for minimal 'bog'.
 
Chas said:
RickCJ7 said:
Checked the ac pump on my buddies 530, it pumps about the same amount of fuel but shorter duration.
His does not bog at all or blow back thru the carb when you blip it full throttle.
Click to expand...

Ideally the fuel squirt should be very short at about one second or less for minimal 'bog'.
Click to expand...


I tried it with more fuel and less fuel, more fuel helped it some but still not right.
I've read that used as dual sport the 3 second pump is what you want.
Its not the duration thats causeing the problem its the initail squirt. I dont even think its the ac pump now maybe tPS or vales tight!
 
Wasted another afternoon on this bog, set the valves, raised the needle 1 clip played around with fuel screw and ac pump timing. Still bogs and I think I'm making it worse. Does squirt 3x the fuel as the KTM 530.
Could the plug cause this?
Could a jet or something clogged in the carb do this??? THe bike runs perfect other than the off idle bog.
Any other ideas?

Couldn't figure out how to check the TPS but I did unplug it and it still bogs.
Lowered the needle to the 7th notch, no good!
 

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