LKR
Adjunct
Reged: 01/14/05
Posts: 185
Loc: Drayton Valley Alberta, Canada
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Who is running these carbs and what is the verdict on the actual real world performance and ease of use compared to the CVK's. Is the coversion a huge improvement or just so so. I know I have asked this before but can't remember what the answers were.
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mag10
Adjunct
Reged: 01/16/08
Posts: 576
Loc: Wisconsin
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Quote:
Who is running these carbs and what is the verdict on the actual real world performance and ease of use compared to the CVK's. Is the coversion a huge improvement or just so so. I know I have asked this before but can't remember what the answers were.
I have the 39 FCRs and oh yes, there is a big difference compared to the CVKs. The throttle response is awesome. You can do all of the tweaking there is with the CVKs and still not get into the realm of the FCRs.
I would say they are not for the unhandy/mechanically challenged as they are have a lot of adjustments and tuning potential to sort thru.
Also keep in mind these are racing carbs and do not have niceties like a choke and require more fiddling around at startup than would a normal street setup. 
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05 speedmaster - 904cc, 12:1 JE racing pistons, thunderbike cams, ported and polished head, scepter pipes, blueprinted manifolds, 39mm FCR's
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SDKimo
Adjunct
Reged: 07/02/06
Posts: 720
Loc: Huntington Beach, CA
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How hard is it to cold start the bike?...I have heard it is one to two twists then start. You have to keep giving gas until the bike warms up...that is you can't cold start and ride away...My issue is I ride to work between 6 and 6:30 and don't want to be idling the bike on the side street...
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mag10
Adjunct
Reged: 01/16/08
Posts: 576
Loc: Wisconsin
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Quote:
How hard is it to cold start the bike?...I have heard it is one to two twists then start. You have to keep giving gas until the bike warms up...that is you can't cold start and ride away...My issue is I ride to work between 6 and 6:30 and don't want to be idling the bike on the side street...
I too usually head to work at 0600 and try to not wake the neighbors (well I don't really try that hard).
It actually starts better cold than the original carbs, keeping it running/idling cold is another matter. I have worked up a little 'ritual' that seems to be effective. I turn the idle speed screw in 2 full turns and slowly twist the throttle 5 to 7 times and then light her up. Starts on the first hit. It does not idle high when cold, even with the idle screw cranked in. I don't lower the idle until I am actually riding and then I with just wind it down as I ride along.
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05 speedmaster - 904cc, 12:1 JE racing pistons, thunderbike cams, ported and polished head, scepter pipes, blueprinted manifolds, 39mm FCR's
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LKR
Adjunct
Reged: 01/14/05
Posts: 185
Loc: Drayton Valley Alberta, Canada
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I appreciate the info. My kid's Yamaha racing quad had an FCR39 and once I got it setup correctly it started and ran great even in the winter months. There is a company called JD jetting that makes excellent products for the FCR when used on the Yamaha quad. Also installed a little thing called a "quick shot" which boosts the fuel volume from the accelerator pump when you whack the throttle. Works great on the modified quad but would probably be way overkill on our bikes.
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marty
Learned Hand
Reged: 03/23/08
Posts: 1155
Loc: Alberta,Canada
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call FF. 
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roadworthy
Old Hand
Reged: 08/29/07
Posts: 8887
Loc: St Louis MO
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Quote:
call FF.
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I stopped fighting my inner demons. We're on the same side now.
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69tri1
3/4 Throttle
Reged: 02/07/05
Posts: 930
Loc: Butler, PA
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Quote:
call FF.
Who are you referring to Fast Freddy? I gave up trying to get in touch with him. I actually bought a spare set of carbs that I was going to have him work over after spending much time with him on the phone then he diapeared off the site and does not answer his phone any more. So I am leaning towards the FCR's as well. 
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LKR
Adjunct
Reged: 01/14/05
Posts: 185
Loc: Drayton Valley Alberta, Canada
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You are real comedian Marty. Don't get me on a rant about our good friend Fast Fred. That name is very fitting.
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LKR
Adjunct
Reged: 01/14/05
Posts: 185
Loc: Drayton Valley Alberta, Canada
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You were lucky. He's got a set of my carbs and a head which I will never see again and oh yea the money up front to do the work on them. It's been about 3yrs. now.
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