I just got a set 35mm FCR carbs and I have been seeing that there is a 39mm. Does anybody know where you can get them or are people just boring out the 35mm

 

to large of a carb will hurt you
fcr's are at the end of my upgrade list

 

Everyone is getting the 35mm, you wont want 39mm it's to big. FCR's are on the bottom of my list too. Their way to damn expensive but if you need em you need em.

 

Most do not need them. Airraptor has them on his 727 and made 62HP. I think he could have done better with out them. I have the stockers on my 686 and 67HP on the same dyno. I am going to try them out but do not expect to pick up more than 1hp. Hopefully i will get a little better throtle responce.

 

you and your $hit stirring stick...lol

 

They were also on the bottom of mine. I got a set a month or so ago and now wish it would have been my 1st upgrade. Not just for power and throttle response but they are just so much easier to jet. I spent months trying to get the stockers just right and anytime I made any kind of change it to that long again to get it right and I'm not just talking about on top end. I am talking about having no stumble or heistation throughout the rpm range. The FCR's were jetted correctly within an hour and runs perfect at all rpm ranges. I also can change main jets without disassembling the bike or removing the carbs.

FCR's are definately one of the best mods I have ever made!!!!!!!!!!!!!!!!