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Man taking a FCR41 to the head being thrown out of a lathe would feel nice....great work I have a slant 39 sitting on my desk needing to go on the 501
hello everyone, I am asking for help, I need to adjust the carburetor keihin fcr 41 in my husaberg fc 600 00 I will add that it works on the original delorto and it does not want to on keihin, sometimes it will start and suddenly go out twice so it bounced that little legs did not break off once I even managed to ride , there is enormous power and I like my Berg very much, I need to tune this carburetor to this model, I think that knowledge will be useful to someone, please help ...
- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
how about a name fella? or a Nikname?
Not so fast buddy, your job isn't finished yet!
that tube may be shortened but I want you to remove the carb aagain and look in the back of the rubber on the head, there, you'll see two lips inside when all you need is one. slice 5mm off with a razor blade and use the outside of the wall grinder wheel to level and smooth off. you then need the groove in the alloy tube to be corrected but it will be a valuable 5-6mm because the rubber boot looks stressed even in the last photo.
Then you want to pay particular attention to two things that go wrong with the Mk1.
the first is the throttle slide has a plate affixed to it on the downwind side. this can flutter making a clucking noise and then it rattles then it fractures and gets sucked in byt he engine - luckily with no consequences.
the second is the O ring on the fuel valve. this goes rock hard after 20+ years and floods the engine with fuel. I do a Husaberg jetting kit for your bike. the needle has three angles of taper and not the one the factory at Keihin gave it.
you'll also need to keep the APJ working so that you have a form of choke. it looks like that carb was once in a bank of 4 on a 4-cylinder bike. The old mod 20-years ago was called "The Taff Mod" (what happened to him?) but nowadays we'd use a spacer on the pump diaphram.
Taffy
Not so fast buddy, your job isn't finished yet!
that tube may be shortened but I want you to remove the carb aagain and look in the back of the rubber on the head, there, you'll see two lips inside when all you need is one. slice 5mm off with a razor blade and use the outside of the wall grinder wheel to level and smooth off. you then need the groove in the alloy tube to be corrected but it will be a valuable 5-6mm because the rubber boot looks stressed even in the last photo.
Then you want to pay particular attention to two things that go wrong with the Mk1.
the first is the throttle slide has a plate affixed to it on the downwind side. this can flutter making a clucking noise and then it rattles then it fractures and gets sucked in byt he engine - luckily with no consequences.
the second is the O ring on the fuel valve. this goes rock hard after 20+ years and floods the engine with fuel. I do a Husaberg jetting kit for your bike. the needle has three angles of taper and not the one the factory at Keihin gave it.
you'll also need to keep the APJ working so that you have a form of choke. it looks like that carb was once in a bank of 4 on a 4-cylinder bike. The old mod 20-years ago was called "The Taff Mod" (what happened to him?) but nowadays we'd use a spacer on the pump diaphram.
Taffy
- Joined
- Jun 27, 2020
- Messages
- 26
- Location
- ohio
The boot only has 1 rib in it and I measured it to cut the groove in the carb so it fit real nice.
Brian
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- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
Hi Brian
that rubber is different, honestly. I have one in the workshop with two ridges inside. it would have given you another 5mm. here's a photo of one I chopped up years ago. the next stage would have been to go to the wall grinder and shave the rubber entry flat and smooth.
Taffy
that rubber is different, honestly. I have one in the workshop with two ridges inside. it would have given you another 5mm. here's a photo of one I chopped up years ago. the next stage would have been to go to the wall grinder and shave the rubber entry flat and smooth.
Taffy
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