New airbox ?? - Suzuki Volusia Forums : Intruder Volusia and Boulevard Forum
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post #1 of 7 (permalink) Old 07-18-2019, 03:21 AM Thread Starter
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New airbox ??

So I bought an airbox from a M50 for my 02 Volusia and when I put it on it wants to stutter about mid range through the gears
When I put the old airbox on it's fine ...
I was thinking these where interchangeable and really want to make this work
Ideas ? Suggestions ?
Love the year drop and hate the alien head
Please help
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post #2 of 7 (permalink) Old 07-18-2019, 07:09 AM
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The stutter is there because you changed the volume of air, without changing how much gas you are adding to the mix. You could be rich, you could be lean. My suggestion would be to put the newer air box on and pull the enrichment knob out to see if the performance improves. If it gets better, then you will have to rejet the carb. What jets? No clue - nobody has done what you are doing and posted the results. Good luck.

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post #3 of 7 (permalink) Old 07-18-2019, 07:58 AM
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FWIW: The "Alien Head" air filter box was actually created to mimic the shape of the Daytona Race Track in Volusia County, Florida.
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post #4 of 7 (permalink) Old 07-19-2019, 02:15 PM Thread Starter
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I didn't know that
But I did try the screw knob on the left side , pulled out the house with the screw piece on the end
No luck
Is the a way to access the air /fuel mixture screw on the carb?
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post #5 of 7 (permalink) Old 07-22-2019, 03:43 PM
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There is a fuel mixture screw on the carb, but it's for the pilot circuit so only really affects idle to about 1/8 throttle. Past that the needle is metering the majority of the fuel, so pilot screw adjustments for a mid-range problem will have very little effect. On most street legal carbureted bikes there in an anti-tamper plug over this screw due to emissions regulations. Drill a small hole in it and a small pick usually pops them out without too much hassle.

Stuttering to me most likely suggests a rich condition (lean is usually a bog/loss of power, rich is spits/sputters), and if it's in the mid range I'd probably look to lower the needle a bit. OEM needles usually aren't adjustable, and while you can raise/richen them with a shim, to lower them you will need to get an adjustable needle. Most jetting kits include an adjustable one.

I'm sure with enough fiddling around you could get it to run cleanly throughout the throttle range, but if you're not familiar with carburetor tuning it's going to be a huge amount of trial and error.
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post #6 of 7 (permalink) Old 07-24-2019, 09:16 AM Thread Starter
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Dang,
thanks for the response !!
I was hopeing to get a plug and play option cuz I don't wanna mess with the carb
Wished I knew how to measure volume of air then I would know if it's getting to much or not enough
Ill
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post #7 of 7 (permalink) Old 07-24-2019, 08:09 PM
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Do that on your next EFI bike

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