Using 2, Mikuni VM 32 mm Round Slide Carbs?? - Yamaha Raptor Forum
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post #1 of 13 (permalink) Old 08-29-2016, 01:17 AM Thread Starter
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Using 2, Mikuni VM 32 mm Round Slide Carbs??

If I was to use 2, Mikuni VM 32 mm Round Slide Carbs in place of the stock CV carbs would I gain any bottom end power/harder acceleration? I want to pull the air box lid off my piped 660 but the CV slides do not seem to like the grater air increase and give it a slower throttle response.

Thanks in advance for any help.
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post #2 of 13 (permalink) Old 08-29-2016, 02:35 AM
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We all (okay, many of us) run lidless with improved performance... but it absolutely requires DJ aftermarket needles (more aggressive taper), 160 left /165 right Mikuni (or 146 L/148 R DJ) mains and 25 pilots.

What have you tried that has left you unsatisfied?

'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'04 Suzuki LTZ400
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post #3 of 13 (permalink) Old 08-29-2016, 12:07 PM Thread Starter
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I just do not care for the sluggish throttle response of a CV carb, I would much rather have a faster responding/harder hitting bottom mid range power that a round slide carb produces vs the CV carb.
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post #4 of 13 (permalink) Old 08-29-2016, 04:39 PM
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Okay, thanks for the explanation.

Hopefully, someone here will have experience with slide carbs and be able to help you.

'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'04 Suzuki LTZ400
'16 RZR XP4 1000 Turbo
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post #5 of 13 (permalink) Old 08-29-2016, 06:44 PM Thread Starter
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Okay, thanks for the explanation.

Hopefully, someone here will have experience with slide carbs and be able to help you.
Thank you, I am sure someone will.
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post #6 of 13 (permalink) Old 08-29-2016, 06:55 PM
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I don't see how switching to a vintage mechanical carb is going to improve anything. It would probably be worse with no accelerator pump, and a big round slug for a slide.

There is a reason why modern carbs have moved to flat slides like the Keihin FCR and Mikuni TM carbs. They also have accelerator pumps which helps with throttle response.

2003 Limited Edition Raptor
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F.A.S.T. Dune Ported 4mill, CPI Inframes, Keihin PWK33's, Direct Drive Lockup. 158 mians, CEL needles second clip, #48 pilots, air scews 2.0 turns out.
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post #7 of 13 (permalink) Old 08-29-2016, 07:00 PM
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I just do not care for the sluggish throttle response of a CV carb, I would much rather have a faster responding/harder hitting bottom mid range power that a round slide carb produces vs the CV carb.
Jamming a carb wide open at idle isn't going to make hard hitting low end power. You really have to work with FCR's to get them to be able to do that. Other wise it just bogs and stumbles for a few seconds if it doesn't die. What type of riding would require this type of throttle use anyway?

2003 Limited Edition Raptor
Kenz 720cc 11:1 stroker, +1 valves, Mega Cycle X-4 Cam, Sparks 6x Big Core, Keihin 35mm FCR's. 158 mains, 52 pilots, fuel screws 2 turns out.

97 Banshee
F.A.S.T. Dune Ported 4mill, CPI Inframes, Keihin PWK33's, Direct Drive Lockup. 158 mians, CEL needles second clip, #48 pilots, air scews 2.0 turns out.
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post #8 of 13 (permalink) Old 08-29-2016, 07:08 PM Thread Starter
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I don't see how switching to a vintage mechanical carb is going to improve anything. It would probably be worse with no accelerator pump, and a big round slug for a slide.

There is a reason why modern carbs have moved to flat slides like the Keihin FCR and Mikuni TM carbs. They also have accelerator pumps which helps with throttle response.

I refuse to drop $800 for the FCR carbs, and I read online on several websites that a mechanical carb would offer more of a low end power hit then the CV carbs will, but I do now know, hints why I asking.
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post #9 of 13 (permalink) Old 08-29-2016, 07:32 PM
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I refuse to drop $800 for the FCR carbs, and I read online on several websites that a mechanical carb would offer more of a low end power hit then the CV carbs will, but I do now know, hints why I asking.
The other problem is fitting two carbs in there. FCR's are pretty narrow per carb where individual carbs are going to be a little wider and might not be able to fit side by side.

2003 Limited Edition Raptor
Kenz 720cc 11:1 stroker, +1 valves, Mega Cycle X-4 Cam, Sparks 6x Big Core, Keihin 35mm FCR's. 158 mains, 52 pilots, fuel screws 2 turns out.

97 Banshee
F.A.S.T. Dune Ported 4mill, CPI Inframes, Keihin PWK33's, Direct Drive Lockup. 158 mians, CEL needles second clip, #48 pilots, air scews 2.0 turns out.
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post #10 of 13 (permalink) Old 08-29-2016, 07:43 PM Thread Starter
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The other problem is fitting two carbs in there. FCR's are pretty narrow per carb where individual carbs are going to be a little wider and might not be able to fit side by side.
That is true never though of the fitment issue, DAMN I do not know then and like you said the round slides have no accelerator pump so idk... can the accelerator pump be adjusted for a bigger fuel stream maybe??
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