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Cruisers - America, Speedmaster Cruiser chat for America and Speedmasters

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Old 05-01-2011, 11:39 AM   #1 (permalink)
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Speedmaster carbs

I'm thinking that the stock carburetors that came on my 2007 Speedmaster are Keihin CVK 32's. Correct or no?

I live at 4800' (1450 meters) and normally ride between 4500' (1375) and 7000' (2150).

I replaced the 48 pilot jets the previous owner's dealer installed when he put on short TORS and a K&N air filter with 42 pilots as well as balanced the carbs. This "fixed" my gas mileage (and hence, range) problem, going from sub 30MPG to 40-45MPG (US). Bike still runs great.

However, my pilot screws are turned all the way in, zero (0) out, and messing with them doesn't change the idle at all. I'm wondering if I need to go down in size on the jets to, say, a 40, but I'm having a real problem finding a source for those jets, especially because I live no where near a dealer and rely on online parts places for most all my needs.

Is going to a 40, if I can find one, the right next step (where might I find 40's)? Are these carbs really CVK 32? Thanks in advance.....
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Old 05-01-2011, 01:56 PM   #2 (permalink)
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I think they CVK36, the number is the size of the bore in mm. Either way it's not relevant to ordering jets, they both take the same.

42 pilots are stock but at your elevation you may need to go a size smaller.

Sudco.com seem to be the hot ticket for an online carb parts supplier in the US.
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Old 05-03-2011, 09:29 AM   #3 (permalink)
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Eddy is a good guy who provides great fast service. Ordered many parts from him for my 06 America.
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Old 05-03-2011, 10:28 AM   #4 (permalink)
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I've had great luck in dealing with Triumph Performance. Carlos is great to work with and will go out of his way to make sure that you're a satisfied customer.

http://www.triumphperformanceusa.com...page=page&id=3
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Old 05-04-2011, 09:14 AM   #5 (permalink)
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Checking all the Triumph sites for 2007 Speedmaster turns up only pilots in 42, 45, and 48. Surfing showed that lots of "recreational" machines use Keihin CVK36's - from Harleys to snow machines. Went to my local generic Honda-Sukuzi-Kawasaki-Polaris Motorsports dealership and ordered a couple of 40's that should be in today. If they work its nice to know in case I want to go to 38's or 35's if I ever climb Pike's Peak on Speedie ! I'll post results when I have them in a few days.
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Old 05-04-2011, 07:15 PM   #6 (permalink)
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You should not need to go less than 40's.

Can you clarify how the needle is currently set?

Last edited by B02S4; 05-04-2011 at 07:19 PM.
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Old 05-05-2011, 09:10 AM   #7 (permalink)
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I got the Dynojet kit last year because I was getting less than 30 US MPG after buying the bike from a guy on eBay the previous Fall. I decided to learn a thang or two about carburetors, and not have to rely upon a Triumph stealer - closest one being over three hours away. Anyway, followed DJ written instructions, #2: "Install the Dynojet needles on groove #4 from the top, using all stock spacers. Install the Dynojet washers above the E-clips (2 per needle)."

Due to the altitude I live and ride at I replaced FP 125K mains with Dynojet 114's (forget what that is in a Keihin). Noticed the pilots in the carbs were a whopping 48, so replaced them with 42, and balanced the carbs. Bike runs fine and now gets 40-46 US MPG with the desired increase in RANGE.

But, the air screws are all the way in and seem to have no effect when turning out, so I've left them set at zero turns out (they are the NewSpeedmaster brass thumbscrews). Although the bike is running fine, I'm sure I can do better before I drag it down to a guy with a Dyno. I'm also contemplating the installation of some type of Innovate A/F gauge, but that was gonna be another thread...........

Last edited by skinman; 05-05-2011 at 09:18 AM.
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Old 05-05-2011, 05:27 PM   #8 (permalink)
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DJ sizes the mains by actual bore size, Keihin does not. For reference, here is one interpretation of how the two cross reference, although I suggest using this as nothing more than a rough guide: http://www.jetsrus.com/FAQs/FAQ_miku...ihin_sizes.htm

Your sig makes reference to "2 shims above 4/6 DJ needle"...what shims specifically, & where are they placed?

Ever had an A/F meter dyno run to see what's going on WOT & how it rolls through the mid-range WOT?

Ideally, you would get the mains close, then tune the needle, then set the float heights, then tune the pilots & pilot screws.

BTW, the pilot screws are "fuel" screws, not "air" screws; out = richer, in = leaner.

The mains & needles influence much more than what many believe. That said, with the AF meter one does not need to speculate.

I have an Innovate G2 gauge & LC1 controller on mine.

Last edited by B02S4; 05-05-2011 at 05:33 PM.
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Old 05-06-2011, 05:03 PM   #9 (permalink)
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Quote:
Originally Posted by B02S4 View Post
...what shims specifically, & where are they placed?
Dynojet Stage 1 kit exactly per instructions. Used their 114 main jet. Aside from that....also replaced FP48 pilot with FP42 pilot.

Oh, jets are backordered. Won't be in until the end of May.........

Last edited by skinman; 05-06-2011 at 05:06 PM.
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Old 05-19-2011, 01:11 AM   #10 (permalink)
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Quote:
Originally Posted by B02S4 View Post
I have an Innovate G2 gauge & LC1 controller on mine.
Is that a permanent setup? How did you mount stuff? Pix?
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