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July 20th, 2008, 06:50 PM   #1
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yet another 550 jetting thread

Hi HusaGuru's, I wanted some input on jetting a 550. It ran good no matter what jets I tried(stock, etc.), but would like to here from more experienced jetting technicians.

Altitude 8-12k feet
pj 42
paj stock
mj 165
maj stock
NCVS needle clip 4
fs 1.5
honda AP diaphram
FP emulsion tube

Basically Buzzard's set-up. Runs great! Can I do better? After quite a bit of testing today, it is all starting to feel the same when riding, better than stock... Yes I read the DOC and forum searches. The DOC does an excellent job of explaining all the nuances of the FCR, but without a wideband o2 or a dyno, real changes are hard to note. Its seems these bikes run good no matter what you do, very forgiving. thanks gents!!


jz
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July 21st, 2008, 02:15 PM   #2
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Contact DaleEO for any further jetting and set up tricks on the 550. He has done a lot of research on the 550. We have a 550 in Montrose jetted just like yours, and like it a lot..
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July 21st, 2008, 07:28 PM   #3
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Re: yet another 550 jetting thread

Originally Posted by jzfe
Hi HusaGuru's, I wanted some input on jetting a 550. It ran good no matter what jets I tried(stock, etc.), but would like to here from more experienced jetting technicians.

Altitude 8-12k feet
pj 42
paj stock
mj 165
maj stock
NCVS needle clip 4
fs 1.5
honda AP diaphram
FP emulsion tube

Basically Buzzard's set-up. Runs great! Can I do better? After quite a bit of testing today, it is all starting to feel the same when riding, better than stock... Yes I read the DOC and forum searches. The DOC does an excellent job of explaining all the nuances of the FCR, but without a wideband o2 or a dyno, real changes are hard to note. Its seems these bikes run good no matter what you do, very forgiving. thanks gents!!


jz
Hi Jz,

Yes you can do better, at least I'm pretty sure you can.

I'll give you some suggestions here but let me know what kind of riding you are doing at 8-12K. I see that it is supposed to be between 49 and 80 degrees for the next several days so I'm going to assume those are the temps you are riding in.

By the looks of things I'd say you are still pretty rich for that altitude and also with the high humidity as well.

You might give these settings a try:

NCVS @ #3.
main jet: 158
pilot jet: 38

Try the 38 pilot first and see if you're in range on the pilot screw-- between 1 & 3/8 to 2 & 1/2 turns out. Be sure the bike is warmed up fully, at least 15 minutes of riding around. Turn the pilot screw in until the motor just starts to slow down, then back out one full turn. This will give you a good starting point for the pilot screw. If you end up under 1 & 3/8 turns out try going to a 35 pilot.

Have a look at the jetting chart here: http://www.husaberg.org/index.php?full= ... _photo.php

You will notice that I suggested two jet sizes smaller than what is in the chart. This is due to the increased intake impulse of the larger motor through the same size carb as the 450R Honda. That's kind of a rule of thumb, and it is usually very close to perfection.

Now you will be able to use this chart as the weather or your altitude changes. I went with the 59-80F range and 7500-10000 feet settings for my suggestions to you since your riding area goes a bit higher, and it's pretty humid there.

I think with these settings you will find that power band is wider, and it will pull really strong from the low end.

If you have any questions feel free to ask.

Dale

P.S. Thanks for the props Buzzard!!
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July 22nd, 2008, 12:11 AM   #4
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Re: yet another 550 jetting thread

Originally Posted by DaleEO

You will notice that I suggested two jet sizes smaller than what is in the chart. This is due to the increased intake impulse of the larger motor through the same size carb as the 450R Honda. That's kind of a rule of thumb, and it is usually very close to perfection.
be careful dale

you haven't taken into account port dimensions or valve sizes let alone the cam grind. fuelling is all these and the HP it puts out as well and the 450 puts out a lot!

real life testing is where you'll find the answers and not on the maths table. we don't always have the full picture and so make surre your tests bear all your calculations out.

i'm not saying you have the wrong answer but that how you got there isn't the right route.

regards

Taffy
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July 22nd, 2008, 05:48 AM   #5
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Re: yet another 550 jetting thread

Originally Posted by Taffy
Originally Posted by DaleEO

You will notice that I suggested two jet sizes smaller than what is in the chart. This is due to the increased intake impulse of the larger motor through the same size carb as the 450R Honda. That's kind of a rule of thumb, and it is usually very close to perfection.
be careful dale

you haven't taken into account port dimensions or valve sizes let alone the cam grind. fuelling is all these and the HP it puts out as well and the 450 puts out a lot!

real life testing is where you'll find the answers and not on the maths table. we don't always have the full picture and so make surre your tests bear all your calculations out.

i'm not saying you have the wrong answer but that how you got there isn't the right route.

regards

Taffy
Thanks for the input Taffy,

My suggestions for the jetting for the 550 in comparison to the chart I referenced are from real life testing results @ 8500-9800' msl and 68-80F, confirmed by at least two others who also did a fair amount of testing with an 07 550, and in this case, at the same altitude as jzfe.

My suggestions are, I feel still a tad rich on the main, so I was being a bit conservative there, as that is what I was running last summer at the previously mentioned altitudes. And I also took into consideration my recent change to a 38 pilot for altitudes much lower than that, with the NCVS needle @ #3, once I had discovered my vacuum release plate O ring was leaking a bit. JZFE will have to test out my suggestions and see what he thinks. My hunch is that he will be able to go leaner still on the main, and perhaps go to the NCYS @ #2 which is a half clip leaner than the NCVS @#3. I was going to wait to make that suggestion until after he got back to us with some testing results, if he tried my suggestions.
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July 22nd, 2008, 09:02 AM   #6
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RE: Re: yet another 550 jetting thread

well i like the way you're going and its good to see people working down to 38s. don't forget that i was on my own there till sparks dived straight in last summer and joined in.

but you did compare the honda to the husaberg even though you then say you based it on rides. for instance if what you said was true, my 400 would be on a 160 and your 550 on a 155 etc etc which patently isn't what happens.

tricky old business jetting!

regards

Taffy
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July 22nd, 2008, 04:18 PM   #7
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Re: RE: Re: yet another 550 jetting thread

Originally Posted by Taffy
well i like the way you're going and its good to see people working down to 38s. don't forget that i was on my own there till sparks dived straight in last summer and joined in.

but you did compare the honda to the husaberg even though you then say you based it on rides. for instance if what you said was true, my 400 would be on a 160 and your 550 on a 155 etc etc which patently isn't what happens.

tricky old business jetting!

regards

Taffy
Right!,

It is a tricky business but, as you told me on a thread, just devote time to testing, and it will be fun. And you were right, it was fun, especially when you start making changes and keep notes and it eventually leads to a logical conclusion, and the improvement you were looking for. While other bikes, and jetting spec's tend to be a bit anemic at high altitudes and warm temps, with the changes I have made, the bike is crisp and very responsive in these conditions. In fact, with the right flick of the wrist it is rather explosive when you want it to be. Having the ability to seat bounce over seveal whoops is great, but, the bike still has great low speed manners.

You just have to put the time in doing the testing. Yes, I did compare the Honda and the Husaberg, but, only for the purpose of relating the Husaberg to the Honda chart so that one could just plug in what they were using, or overlay it at a given point and have the chart there to make adjustments for temp, and altitude. Sorry if I came off incinuating that one could just make this a hard fast rule.

So far, it has worked out really well for me. The only change left for me to make when I have the time to devote to it, will be to go to the smaller paj to smooth out the transition from closed to just opening the throttle, and as I said in another thread, the last time I tried to pull the paj it was stuck so I will need to have an extraction set at the ready when I get ready to change the paj.

JZFE, Have a look at this thread when you get the chance. http://www.husaberg.org/index.php?name= ... 5778#75778

The above linked thread is my the result of my ongoing search to get rid of the rich stumble that comes in when the bike is ridden slowly on technical trails for a long time and starts to get hot.

One other thing JZFE, Buzzards friend Brett rides an 07 550, and is running the NCVS @ #3, 40 pilot, and a 158 main. But as I have indicated, I think the 38 is the way to go, you'll just have to do a bit of testing there and see how it works out. Just remember, if the bike still runs at idle with the pilot screw turned in all the way the pilot is too big.
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July 22nd, 2008, 05:33 PM   #8
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RE: Re: RE: Re: yet another 550 jetting thread

WOW, that is way leaner than I thought could be run without getting combustion temperatures unacceptably high. Thanks for all the info and discussion on the subject. I will continue testing this weekend. thanks again!!

jz

ps. fritz already sold my 450, and the 550 is completely AWESOME!!!!!!!!

pss I changed my signature in my account, but it did not show up on screen
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July 22nd, 2008, 08:24 PM   #9
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RE: Re: RE: Re: yet another 550 jetting thread

you have to change your signature at another location in your control or account page. thats all I can add to this very very good jetting thread
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July 23rd, 2008, 12:35 AM   #10
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RE: Re: RE: Re: yet another 550 jetting thread

i had someone ask me about the EKR DVR last night and i thought i'd mention here that the needle straight is too fat. you get a stumble when moving off, nowhere else, just moving off.

in the doc it does say EKQ. even a P but they tend to eight-stroke when warm and in the USA and our summer would be a pig to start after a fall. this is not the same bog as the many others that you can get (rich, lean, needle clip etc) so i would ask anyone who wnats to get their jetting right to get athe correct D or E series recommended in the doc. or the honda series which i have yet to test.

regards

Taffy
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