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November 16th, 2013, 10:11 AM   #1
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FCR conversion

It seems that I have found a carburetor off a WR450 nearby. Ive been reading the owners doc for a while now but I would still like to get an accurate answer for what I have to do in order to fit this carburetor porperly. Im mean aside from the throttle and cable, things like jetting?

Cheers, Tom
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November 16th, 2013, 11:38 AM   #2
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Re: FCR conversion

I'd look into getting a jet kit, there exist Berg-specific ones, and because of emissions restrictions the factory has to contend with, plus accumulated experience on part of technically söcapable owners, the jet kits tend to make the bikes run very very well.
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November 17th, 2013, 04:01 AM   #3
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Re: FCR conversion

I will buy a jetting kit, but for now only the carb. Will it run as it is? Even if not perfectly can I still use it whitout a specific jetting kit?

Tom
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November 17th, 2013, 07:07 AM   #4
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Re: FCR conversion

i bought an fcr from a kxf250 and just bolted it on my '00 400. runs fine with just an occasional tweak of the pilot fuel (a zip-ty extended screw helps)
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November 18th, 2013, 05:32 AM   #5
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Re: FCR conversion

the jap needles are very rich on the straight = where you idle so they can backfire and stall when hot. they also run large PJs.

so they generally run OK but rich.

best get a jetting kit then....but I would say that wouldn't I!!!!

Taffy
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November 18th, 2013, 08:01 AM   #6
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Re: FCR conversion

I am thinking of a jetting kit but that won't be till spring. Bike is going to hibernate during winter time so getting the carb for now is enough. I am also thinking of getting a bash plate or skid plate, any ideas where can i buy one in Europe? I found one in the US but would be better if I get one from here.

Tom
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February 8th, 2014, 03:51 AM   #7
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Re: FCR conversion

I'm wondering what happened with this. I'm also looking at an fcr conversion for my 01 fe650. The wr450 uses a fcr39 as does the yzf. The crf450 uses a fcr41. I'm watching fleabay but not sure which one would be best. I don't ride the 650 balls to the wall. I use it to Dualsport and the occasional single track when I want a workout. I'm sure either carb will need jetting and tuning. Any input on size of carb and or years best suited for the 650 would be great. Thanks in advance.
K
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February 8th, 2014, 04:04 AM   #8
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Re: FCR conversion

Send Tamas a PM as he did have an FCR for sale at christmas time. (Great guy to deal with)

I put a 41 on my 02 650, it made a big difference over stock but still rideable on tighter tracks........just had to respect the throttle a bit more.

Carl
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February 8th, 2014, 02:56 PM   #9
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Re: FCR conversion

41s are a good size for 250Fs

43mm isn't to big for 570 RFS

I reckon get the "big" 41mm one ...

also ... maybe ask the guy you got the crank from if he has a spare adapter . .hes using a 40mm carb and also bought a jet kit, if you went 40mm you could compare jetting with him

viewtopic.php?f=7&t=17492

for the jetting main thing you need to do is put a smaller Main air jet in then everything is much easier to understand.
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February 9th, 2014, 03:22 AM   #10
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Re: FCR conversion

Thanks

So the 41 seems the best? They seem to be readily available w/ throttle and cables off a crf450. Any particular years best or changes?
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