FE550 jetting

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Husa98

Joined
Jul 29, 2002
Messages
201
Location
Zwiesel, Germany (Bavarian)
I did only 30 km with my 06 FE550, but I think it is a high fuel consumption in comparison with my 501.
(501:FCR40 from Yamaha, 168 MJ, Yamaha Needle)

(550: 182 MJ in series)
The PJ seems to rich too.

What can be recommended (by the 550er owner)?
 
Hi Husa98,

I run a 04 550 and these are my settings they work for me exerlent.

MJ 150
PJ 40
PMS 1.5 turns out
PAJ Mine is adjustable at just over 1/2 a turn but fixed around #65
Needle DMS clip 4
I run the AP disconnected but people turn down the duration to about .75 to 1 second.
The jetting that comes standard is ridiculously over rich.
The above settings my need slight adjustment depending on your location.

Regards

Sparks.
 
Thank you spark,

in the first step i will try a smaller MJ with the original needle.
 
I did a further ride on a mx and enduro track.

The bike runs very well.
Starts hot with the estart immediately.
No bog.

With the open akraprovic i have to turn the pilot screw 1/4 turn out to mimimize the backfire.

In 2 weeks i have holidays then i will check the setting.
But when the 182 MJ is in, it is difficult for me to believe a 150 is the right.
I wan´t no more horsepower-the bike has more than enough for me.
 
Hi Husa98,

I can guarantee the 150 MJ works fine but it depends on what needle you are using.
I also run an akraprovic but don't have any back firing problem on the over run, set at 1.5 turns out.

Regards

Sparks.
 
Sparks,

tell me the hole story.
What is your needle and PJ?

Mine should be the original jetting, with the OBDVR Needle.

Thanks!
 
Husa98 said:
Sparks,

tell me the hole story.
What is your needle and PJ?

Mine should be the original jetting, with the OBDVR Needle.

Thanks!
Click to expand...

Husa98,

You are using a DVR needle I have fitted DMS on the 4th clip from the top this was recommended by Taffy, my PJ is a 40 my pilot air screw is out just over 1/2 turn but a fixed air jet is #65, and the mixture screw 1/2 a turn out, these settings on my carb work really well for me. My AP is disconnected.
 
sparks

that mixture screw works best at 1.5 turns out. any less and the PJ was too rich. so 0.5 turns is low and you should try that 38PJ sometime.

thanks for the eyes up with foggy BTW. i must have heard it all wrong...

regards

Taffy
 
Sorry about that Taffy, I had an horrendous day down in Benidorm yesterday trying to get my car through the MOT but Eighty Euros later I got the sticker. And my problem was emissions can you believe it :oops:

Yes I should of said 1.5 turns out.

Regards

Sparks.
 
The DMS is richer than the DVR with same clip pos.

I will try at the frist step my DVR with a pos 3 (leaner) and a first a smaller MJ.
 
Hi Husa98,

The parallel part of the needle is slightly larger in diameter, but the tapering starts earlier on the DMS.
Go For it, it would be nice to have a third person to say, hell your right it does work well and get rid of all that wasted gas.

Regards

Steve.
 
sparks,

and it works well without the Acc. Pump????
No Bog??

ist the JD Jetting excel wrong???

"S" means 2.765 mm Diameter
"R" means 2.755 mm Diameter
S ist leaner than R

But the JD jetting says more fuel because less diameter for the DMS ???
(30% more fuel at 1/8 throttle)
 
Husa98, trust me it works good jetting used to be my thing but when you have people around like Taffy that has done ground work it saves a lot of time.
Yes it is leaner this is the direction to go like I said before the standard jetting the carbs come with is grossly over rich.
I don't use any AP but most people turn the stroke duration down to .75 to 1 second.
In stead of the fixed PAJ try obtain the austerely type, this way you have got the best of both worlds.
No hesitation and no bog, the idle is ultra smooth and when you blip the throttle it is very responsive and drops immediately to idle a lot better than the standard set up.

Regards

Sparks.
 
Thanks Sparks,

I will try it.

adustment of the AP is clear, I have spend a lot of time in my YFZ450 FCR 40 keihin.



BTW: Do you have a ignintion coil I´m searching for?
 
armin

you may have misunderstood either JDs chart or what he means.

the fact is that if you put the DMS in at clip 3 and the dvr in at clip 1 they are just about identical. the fact is that the two are 2.5 clips apart on the taper. the reason i went to the DMS is because the DVR was on clip 7! so i put a DMS in at clip 5/4 and i had the same- all bar the straight portion. to make them exactly the same you would put a 0.5mm washer under the needle as it sits in the slid and then make the DMS three clip 4.

as a general rule, as the needle goes higher and higher (cip position) in the ET, there is no chance of a lean bog and indeed if i guess right there is no way that i even need the one second of APJ now. but secondly, THE MORE THE NEEDLE GOES OUT OF THE EMULSOIN TUBE THE EASIER IT IS FOR THE FUEL TO GET DOWN THE SIDE AT TICKOVER. so eventually an R becomes an S.

my very last test before the lineaweaver needle was with a DMT and it didn't work. i had an off-idle bog.

getting rid of the off-idle bog is curable with two things:

1) either a thinner needle straight (say DMS to DMR) (but it runs rich and all that goes with it at idle such as having to blip the throttle all the time, poor restart when hot/fall) or:

2) raise the needle (this wrecks mid speed throttle response).

however, as said, the more the MJ comes down the more the needle goes up till in the end you end up like sparks and i on a low MJ, a high needle and NO BOG!!!!!

i would think that it's marginal if sparks felt the difference with a 155MJ. by the time you get to a 145MJ and raise the needle again perhaps you wouldn't have a bog even w/o the APJ!!!!

hope you are now getting the picture?

regards

Taffy
 
Hi Taffy,
answers bellow


Taffy said:
armin

you may have misunderstood either JDs chart or what he means.

the fact is that if you put the DMS in at clip 3 and the dvr in at clip 1 they are just about identical.

No. With this clips the DMS is much thinner and according to this much more fuel from 1/8 to full throttle.
DVR#6 ist the same as DMS2from 1/8 to full throttle.
From idle to 1/8 the DMS is leaner.
That is what the KD chart says to me.
Please take a look at my gallery

The under blue line is DVR#4
The upper green line is DMS#4
Both with 40PJ, 150MJ)




the fact is that the two are 2.5 clips apart on the taper. the reason i went to the DMS is because the DVR was on clip 7! so i put a DMS in at clip 5/4 and i had the same- all bar the straight portion. to make them exactly the same you would put a 0.5mm washer under the needle as it sits in the slid and then make the DMS three clip 4.

as a general rule, as the needle goes higher and higher (cip position) in the ET, there is no chance of a lean bog and indeed if i guess right there is no way that i even need the one second of APJ now.

I agree.

but secondly, THE MORE THE NEEDLE GOES OUT OF THE EMULSOIN TUBE THE EASIER IT IS FOR THE FUEL TO GET DOWN THE SIDE AT TICKOVER. so eventually an R becomes an S.
Please explain this again.

my very last test before the lineaweaver needle was with a DMT and it didn't work. i had an off-idle bog.

getting rid of the off-idle bog is curable with two things:

1) either a thinner needle straight (say DMS to DMR) (but it runs rich and all that goes with it at idle such as having to blip the throttle all the time, poor restart when hot/fall) or:

2) raise the needle (this wrecks mid speed throttle response).

however, as said, the more the MJ comes down the more the needle goes up till in the end you end up like sparks and i on a low MJ, a high needle and NO BOG!!!!!

i would think that it's marginal if sparks felt the difference with a 155MJ. by the time you get to a 145MJ and raise the needle again perhaps you wouldn't have a bog even w/o the APJ!!!!

hope you are now getting the picture?

regards

Taffy
Click to expand...

Why has Sparks a 40PJ with a 65 PAJ?
The doc says 75PAJ for 40PJ.

I will order a
75 PAJ for my 40PJ.
Needle DMS
155 MJ

AP 0.75 sec

OK?
 
Hi Husa98,

I have an adjustable PAJ, I got the 65 fixed air jet from another jet chart as an alternative to my adjusterble one but the 100 that comes standard is to lean, but I think the adjustable jet can be obtain from Keihin, I got mine from Mr Lineaweaver.
I can't understand why people still insist on running large jets.

Regards

Sparks.
 
Hi Sparks,

a friend of mine has an MK1 FCR, the adjustable PAJ was standard.
And this one does fit in the MK2? Fine!

BTW: no chance to get a ignition coil?
 
Husa98 said:
Hi Sparks,

a friend of mine has an MK1 FCR, the adjustable PAJ was standard.
And this one does fit in the MK2? Fine!

BTW: no chance to get a ignition coil?
Click to expand...

What year and model do you want the coil for.

Sparks.
 
armin

there are 2 letters to each clip and some letters are not used so:

dms
dns
dps = one clip
dqs
drs = 2 clips
dss
dts = 3 clips
dvs = 3.5 clips difference plus one width of straight OTHERWISE THEY ARE IDENTICAL.

apologies that i can't count. i thought the difference 2.5 when i used my fingers.

the only difference the width makes is the RESTART/IDLE/AND FIRST YARD. however if the needle is lifted enough the taper has STARTED and therefore the needle is thin again!

scenario:

if i put a solid 1cm bar insdie a 1.1cm tube (both 1metre long) then pour water down the side, the water will barely get down the side - ok?

however, if i pull the inner rod out say 90cm (leaving 10cm still in the tube) there will be a little more flow down the side. same with the needle in the emulsion tube. so that's why, after a while we can put a fatter needle in. this restricts the flow back to as was.

regards

Taffy
 

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