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October 4th, 2010, 07:13 PM   #1
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'05 FE550 jetting issues

I bought a very low hours '05 FE550 last spring and have never been completly happy with the carburation. It has always started very easily, idled fine, accelerated cleanly with no bogs. The original owner had installed a R&D adjustable leak jet kit including ACL pump spring, raised the needle (OBDVT) one notch (6th) and, I believe, put a richer pilot jet (55) in it. My primary complaint is that the bike is way too responsive right off idle - like downright scary on technical trails. I've been riding big-bore bikes for years and this is my 3rd Husaberg. My '96 FE501 was much easier to ride at low speed as was my '02 FE650, although both of them had Delorto carbs and SEM ignitions which may have contributed to their being a bit more docile. I barely crack the throttle on this 550 and it jumps. Neither of my RFS KTMs (400 & 450) nor the YZ400F I had in the past had anywhere near this much throttle response but nor did they have this much hp either. My 550 is almost as much of a handful as was my '87 Husqvarna 500XC.

I've checked various posts on this site regarding jetting and from what I can gather the pilot jet is way too rich (owners manual lists a 3 and the stock main jet (182) is too rich. even with the 55 pilot it idles the smoothest with the fuel screw 2-1/2 to 3 turns out. I've tried pilot jets all the way down to a 42 but the bike dies as soon as I turn off the choke with anything smaller than a 52 and then it has a bit of a bog on acceleration. I removed the R&D adj. leak jet kit and installed the OEM acl pump spring, installed an OBDVR needle (clip in 5th), set the acl pump adj. screw to Sudco's recomended setting, installed a 172 main that I found in my jet collection, and tried it again tonight with a 45 pilot jet. The only way I could get it to idle is with the fuel screw about 3 turns out - approx. the same setting as with the 55 pilot jet. If I open the throttle very fast there is a bad bog but the immediate off-idle responce is still very abrupt. I rode it around for a couple of miles and even thoroughly warmed up there was no improvement.

BTW, I live in SE WA, the elevation is about 1000', and use only premium gas with no alcohol

Any ideas?
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October 5th, 2010, 12:17 AM   #2
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Re: '05 FE550 jetting issues

Before you get too carried away, if its runnin gfine otehrwise, try disconnecting the accelerator pump. Once I got my jetting right on my 650, the AP made it scary in tight going, so I backed off the stroke to almost zero. There's a pic in my gallery, and maybe some info in the Doc too.

Steve
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October 5th, 2010, 04:15 AM   #3
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Re: '05 FE550 jetting issues

Contact Taffy. Get whichever kit/setup he suggests. Follow his instructions. The result will be a perfect care setup for your needs.
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October 5th, 2010, 06:23 AM   #4
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Re: '05 FE550 jetting issues

The thing that bugs me is that no matter which pilot jet I install it idles best with the fuel screw 2-1/2-3 turns out. Also, the fact that it starts best and idles great with a 55 pilot jet makles me wonder what is different about my particular motor. I had given some thought to disconnecting the acl. pump to see what that would do to the jerkiness right off idle. I have shot carb cleaner and compressed air through all the orfices in the carb thinking that maybe something in the pilot circuit was a bit clogged but that made no difference.

What puzzles me the most is reading the jetting specs. others are using successfully - i.e., 38-40 pilot jet, fuel scew 1-1/2-1-3/4 turns out and mine won't run with those settings.
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October 5th, 2010, 12:31 PM   #5
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Re: '05 FE550 jetting issues

my 650 had a idle problem i had to use this needle to fix it "NCVR" i have a 35 pj and 45 PA
you can get it @ you local Yamaha dealer part No: 5TA-14916-VR-00
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October 5th, 2010, 09:48 PM   #6
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Re: '05 FE550 jetting issues

You may want to try disconnecting the TPS, which acts as an ignition advance, and see if this has a positive effect. It will however reduce your fuel economy.

As Steve stated limiting or even removing the accelerator pump should also help. You will probably require a richer needle that Taffy could probably help you with.

A member here may have one of the few Lineaweaver Racing jetting kits that was developed on a 04 550 with complete accelerator removal in mind. The needle was quite fat to make up for the lack of squirt.

Perhaps severely limiting the AP and a bit fatter needle will tone in down to an acceptable level.
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October 5th, 2010, 11:23 PM   #7
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Re: '05 FE550 jetting issues

Originally Posted by husabutt
A member here may have one of the few Lineaweaver Racing jetting kits that was developed on a 04 550 with complete accelerator removal in mind. The needle was quite fat to make up for the lack of squirt.
not true eric. Dales needle is hopelessly rich at idle and the 48PJ sends people into convulsive jerks.

regards

Taffy
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October 6th, 2010, 06:30 AM   #8
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Re: '05 FE550 jetting issues

Originally Posted by Taffy
Originally Posted by husabutt
A member here may have one of the few Lineaweaver Racing jetting kits that was developed on a 04 550 with complete accelerator removal in mind. The needle was quite fat to make up for the lack of squirt.
not true eric. Dales needle is hopelessly rich at idle and the 48PJ sends people into convulsive jerks.

regards

Taffy
When I say fat I mean rich as in fuel mixture not in needle girth which would lean the mix. Just for the record Joe USA was the first to try Dales kit, as he helped deveop it, and thought it was the dogs bulocks or something close. He told me that at first he was apprehensive about removing the AP squirter and left it on initially. It was hopelessly rich down low. After following Dales instruction and pulling the AP it worked to his satisfaction. I have no doubt that your needles have been taken to the next level and are quite refined. I mention Dales kit mostly for historic reasons and to demonstrate that AP removal is not something that was dreamt up in a an alcohohic binge but is in fact a professional tuners idea, akin to the original Taffy mod which precedes complete AP removal (I think). Credit given where credit is due. .
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October 6th, 2010, 08:20 AM   #9
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Re: '05 FE550 jetting issues

Hi all,

Not been around for while, nice to see some of the old guys are still around, and a hole lot of new ones. One thing you could check on seeing as you seem to have to run fairly rich settings is your baffle plate and diaphragm on the slide, if letting in excess air you could be compensating for this with your current PJ and fuel screw settings, I replaced mine and it made a big noticeable difference especially to the idle and just off idle, also with the TPS disconnected made the bottom end more placid. You could also check the inlet manifold, these have given problems in the past.
All just a thought.

Regards

Sparks.
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October 6th, 2010, 08:44 AM   #10
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Re: '05 FE550 jetting issues

My '07 650 has a 50 pilot, screw is 4 full turns out, and the needle is set at the 3rd notch.

I've bought a 52 pilot to put in when I get the chance, hoping the screw can be in a little farther so I won't lose it.

Until I got it richened up, response was violent off idle. Now it purrs like a little Honda, grunts like crazy, throttle response is predictable and smooth, but when I open it up, look out. I'm wondering what it will be like when I get the throttle more than halfway open.

Try moving your needle to the third notch. I hope it works as well for you as it has for me.
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