Big bore kit

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Mar 14, 2021 | 09:32 AM

#11

Mattbastard

Grand HDF Member

Joined: Nov 2009

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From: Tampa

Those high RPM builds use Buell XB heads with a multi-stage porting and larger valves. He did an 883 conversion. While they do work the 883 heads most people don't pour money into them for obvious reasons so I'm assuming he just did the cylinders and doesn't need a better carb.

Lots of people underestimate the CV40.

Mar 14, 2021 | 09:52 AM

#12

1997bagger

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Joined: Aug 2008

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From: Ohio

Quote:

Originally Posted by Mattbastard

Lots of people underestimate the CV40.

They can run real well, have a modded CV on the shelf being violent during acceleration, came across a Mikuni 45 for $75. Mikuni wins the off idle throttle but when the CV came in it did well, the R1(Super G clone) has never been a problem over the years on a stereotyped bad street manor engine. Carbs are just personal preference, they all get the job done, just different small tendencies.

Mar 14, 2021 | 02:11 PM

#13

Mattbastard

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Joined: Nov 2009

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From: Tampa

Quote:

Originally Posted by 1997bagger

There's tricks you can do to make the CV act more like a slide carb. First, drill out the venting hole in the slide. That will make it rise faster but it'll also make the throttle feel more "snatchy". You could also put a weaker spring over the slide but I've never messed around with doing that.

Whacking the throttoe WFO on a slide or butterfly carb often screws with the ratio because the air velocity is low thru the venturi and it's hard to tune, whereas on the CV the slide stays down to keep air velocity high so the mixture stays good.

Last edited by Mattbastard; Mar 14, 2021 at 02:19 PM.

Mar 14, 2021 | 02:16 PM

#14

98hotrodfatboy

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Joined: Mar 2010

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From: Poolville

There's tricks you can do to anything.. Why not just buy something and bolt it on and with a couple of minor adjustments and done... There you go easy peasy... This is what makes the S$S so desireable....

Mar 14, 2021 | 07:04 PM

#15

Mattbastard

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From: Tampa

I guess because I like trying to tweak something myself first before throwing money at an alternate solution.

Mar 14, 2021 | 07:11 PM

#16

98hotrodfatboy

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From: Poolville

Quote:

Originally Posted by Mattbastard

I guess because I like trying to tweak something myself first before throwing money at an alternate solution.

I should've thought a little more before my last statement..

Mar 15, 2021 | 06:49 AM

#17

Mattbastard

Grand HDF Member

Joined: Nov 2009

Posts: 4,315

Likes: 1,663

From: Tampa

Quote:

Originally Posted by 98hotrodfatboy

I should've thought a little more before my last statement..

LOL, I see what you did there.

Mar 16, 2021 | 01:01 PM

#18

grbrown

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Joined: Jun 2007

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From: Bedford UK

The Hammer site has stacks of info on suitable carbs and exhausts, along with dyno curves, so that would be a good place to look. Also their kit when used with stock heads gives a great boost in HP and TQ, porting them simply raises the performance at the top end. A 2-into-1 would certainly be my choice, as for carb, choose your poison, but I recommend you get it set up by a local tuning/dyno shop. I gave up messing with carbs years ago!