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Old 05-10-2012, 11:22 PM   #1 (permalink)
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cv carb specs

Anyone know the stock length of a cv carb spring and the hole that is sometimes drilled out larger in the slide?
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Old 05-11-2012, 01:52 AM   #2 (permalink)
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Read the sticky DAVE63 has posted above on carb rebuilding. you can also use the search. Hole is commonly drilled out to 1/8 inch, don't know what size it is to start. Length of spring will vary, age will tend to take some bounce out and change the unsprung length.
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Old 05-11-2012, 07:36 AM   #3 (permalink)
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Stock spring is 5.5" long, with 12.5 onces for 3" of compression.

Dynojet spring is 5" long with 8.8 onces for 3" of spring compression.
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Old 05-11-2012, 12:06 PM   #4 (permalink)
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Thanks for the info. Any idea if a medium spring will effect mpg compared to a stock spring?
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Old 05-11-2012, 03:23 PM   #5 (permalink)
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The spring determines the effort and time it takes to lift the slide, in conjunction with the airbleed hole in the slide. If the slide rises faster, the vehicle gets more fuel, via the main needle lifting....

Lighter spring = more fuel = less fuel mileage.
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Old 05-11-2012, 03:51 PM   #6 (permalink)
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Perfect, I kinda figured that. Something to think about.
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Old 05-11-2012, 04:25 PM   #7 (permalink)
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Quote:
Originally Posted by evorider1961 View Post
Perfect, I kinda figured that. Something to think about.
I lay awake at night, thinking of the stupidest things.......
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Old 05-11-2012, 07:53 PM   #8 (permalink)
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Quote:
Originally Posted by Dave63 View Post
I lay awake at night, thinking of the stupidest things.......
Seeking knowledge is not stupid, ignoring your concerns is.

I did the same thing when I was building my bike in my mind. Cam choice, carb mods, exhaust and pipes kept me up all night. I'm very pleased with the way my bike performs. You are doing the right thing by asking!

I settled for info partly from Larry hardy performance heads and Steve Mullen from night rider. I choose to use the spring from the SE 44 mm carb. 27728-99 the info is from Steve Mullen on night rider. My cam, crane h-286-2b advanced, thanks to Larry hardy. My exhaust, Larry, cycle shack muffler pipes.

I can't close and go to www.nightrider.com to the v-twin tech site with out loosing this post, but the spring specs to the stock is listed. Some take two coils from the stock.

As noted there is a great post on the cv with pictures on this forum that you should read.


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Old 05-11-2012, 10:20 PM   #9 (permalink)
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Yep I hear you
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