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May 26th, 2013, 12:49 PM   #1
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98FE600 Carb Swap

Hi All,
I'm a new to Husaberg rider. Recently purchased a 98 FE600. I grew up riding dirt bikes in NSW Australia, but have been more in to street & dual sport bikes for the last 15 years. I finally came to the inevitable conclusion that there really isn't a dual sport bike that "does it all". Dual sport to me means compromise on all levels. As such I retired my 06 Triumph Tiger to easier riding duties and am know looking to the FE600 to fulfill my mountain pass/single track duties.
That said, i'm massively impressed with the FE600's power and nimble feel, even for a 98. ( i realize that hard core racers are rolling their eye's right now, but I'm a 40 yo 220lbs (100kg) rider used to throwing XR & DR 650's around fire trails etc). So, to the point, riding the FE on technical lower speed trails is no problem. All the power and response i need. However, running on higher speed desert trails it seems to be choking. Full throttle it reaches around 80mph and start to cough and splutter and feels like it is starving for fuel. After spending many hours reading the 22 pages of the "Fuel" forum i'm honestly bamboozled. Like my new (to me) bike, alot of the info seems to be dated. I would like to change the carb out for a keihen FCR40. I see them on ebay from 2004-2007 Honda CRf250r's for around $150us. I have a very good mechanic locally to help me out with final tuning, but I cant seem to come to a confident decision on what to buy.
Any help with this is greatly appreciated.
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May 26th, 2013, 06:27 PM   #2
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Re: 98FE600 Carb Swap

welcome to the site

i am really happy with my mikuni tm40 pumper, although it does require a different carb/intake boot from sudco and also needs a dual throttle cable setup or a return spring......i am sure the kehins are going to require dual cables etc. to make work too, if you go with the mikuni ill be glad to let you know my jetting specs to help you get close with it.....

what carb do you have? i had the dellorto phm40 originally and it wouldnt sputter at high speeds, maybe there is something up with your existing carb causing the issue?
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May 27th, 2013, 09:08 AM   #3
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Re: 98FE600 Carb Swap

a 15 yr old dellorto probably has seen better days. my 98 600 with stock jetting (in 9 ran hardest from low midrange to top, it was the bottom that needed help. to keep the 'orto, you should at least refresh the needle and nj. slide and body wear are probably also an issue.
i had a 650 with a mk1 41mm fcr and it was a very good setup for overall power after all the mods. replaced it with a dellorto when i sold it and noticed a significant reduction in power. the dual cable thing is a myth. all you need is the pull cable, but if you're buying a used one, a lot of them come with throttle and cables.
and i agree with you about a tiger being a good dual sport. that's what i built the 650 for... to keep me from riding my tiger too far offroad.
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May 28th, 2013, 10:52 AM   #4
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Re: 98FE600 Carb Swap

Originally Posted by ned37
a 15 yr old dellorto probably has seen better days. my 98 600 with stock jetting (in 9 ran hardest from low midrange to top, it was the bottom that needed help. to keep the 'orto, you should at least refresh the needle and nj. slide and body wear are probably also an issue.
i had a 650 with a mk1 41mm fcr and it was a very good setup for overall power after all the mods. replaced it with a dellorto when i sold it and noticed a significant reduction in power. the dual cable thing is a myth. all you need is the pull cable, but if you're buying a used one, a lot of them come with throttle and cables.
and i agree with you about a tiger being a good dual sport. that's what i built the 650 for... to keep me from riding my tiger too far offroad.
Ned, Can you tell me what the stock jetting for the Dell Orto is?
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May 28th, 2013, 01:03 PM   #5
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Re: 98FE600 Carb Swap

although i know the answer ill let ned answer since you asked him
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May 28th, 2013, 07:57 PM   #6
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Re: 98FE600 Carb Swap



this is taken from the 1999 shop manual.

On my 1997 fe600 the stock dellorto specs were

195 main
dr270 tube jet
k51 needle on middle clip
45 start jet
45 pilot jet

i read of people going as low as 33 on the pilot and 40 on the start jet and some to the dr268 tube jet.not sure what the high altitude guys run for a main, it doesnt seem they need a hugh amount of adjustments but maybe some idle screw adjustment and get somewhere in that slightly leaner range that works and it should be close enough in the high altitude


I think the pumper carb would make a noticable power differece wether it be kehin or mikuni or the like. if i did it again i would buy an exhaust system and a pumper carb asap and wake that old girl up

also highly recomended for switching to an unknown carb on an unkonwn bike is a A/F ratio guage with a wideband o2 sensor
http://www.ebay.com/itm/AEM-Wideband-UE ... 9f&vxp=mtr

I know i am not Ned or anything but i hope that helps anyway.........
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May 29th, 2013, 08:00 PM   #7
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Re: 98FE600 Carb Swap

hhhhhhm tough crowd ............
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May 30th, 2013, 09:33 AM   #8
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Re: 98FE600 Carb Swap

although i know the answer ill let ned answer since you asked him
that's a lot of pressure
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June 1st, 2013, 06:02 AM   #9
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Re: 98FE600 Carb Swap

Thanks for Bergini & Ned, sorry for the slow repsonse...work keeps getting in the way of my riding I'm pretty sold on the idea of changing the carb out for a FCR. I live at 7000ft and 10 min ride from here gets me to 12000ft. I'm told the dellorto is a pain in the ass with extreme altitude changes. Anyway, my mechanic is telling me that smaller is better i.e.37-38mm as opposed to the most recommended 40-41mm range. Something to do with thinner air at altitude and high velocity through the smaller carb. So my question is;

Will something like this work;
http://www.ebay.com/itm/2005-Suzuki-...dd0a95&vxp=mtr

Can i jet this up enough for a 600?

I'm off to ride in Lake City this weekend.
Ride on.
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June 1st, 2013, 07:40 AM   #10
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Re: 98FE600 Carb Swap

I have heard similar things reguarding throttle response and veolocity increase with a smaller carb, personally i wouldnt go smalller than a 38mm, theres a lot of cases where guys thought the 501 with a 38mm was quicker to respond than the 600 with the phm40. (also i still recomend a pumper carb, not sure if the one in the photo is or not)I also thought i remember something about it not being the best idea to put a two stroke carb on a four stroke----------->could be totally wrong on that one i have never done it and not even sure if i heard that one right or not but maybe you should research that first just to be sure. also you could find out the carb model number then find out where they sell parts for it and what size jets come stock in the carb and then you can probably find a "jet graph" with all the jets listed for that carb so you know if they will go high enough or at least what kind of range is vailable.

i can say with certanty you will be in uncharted waters reguardless of what carb you go with unless ints keihin fcr41 or mikini tm40, not saying that it isnt possible by any means, just that you will be without help from us here. I would totally get and a/f guage too. ill have one for sale for 110.00 including shipping in probably a week or so ill be done with it. if your interested pm me or else you will find it on ebay. good luck
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