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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Dyno Charts/Testing (Show us the POWER!) » Dyno Test Results - CV40 vs. Mikuni « Previous Next »

This page is to share the results of some dyno testing, comparing the CV40 to the Mikuni HSR42 to the Mikuni HSR42 with the big manifold that Buell sells for the CV44 (an extra ring is included with that manifold to allow the fitment of an HSR42 or even a CV40 for that matter)

CV40 vs. Mikuni vs. Mikuni w/big manifold

I've done this comparison a couple times in the past, but this is the first time I've done it with the benefit of the air/fuel monitor, which ensures I truly had both carbs dialed in the same, or as close as they get anyway.

This was all done on an otherwise bone stock '99 M2, including the muffler.

As you can see, the Mikuni really doesn't bring much to the dyno sheet, and what it brings is mostly on top. The big manifold brought nothing at all.

But, there are a couple things it brings that aren't really shown on an dyno sheet. First and foremost, it has noticeably better throttle response. You really feel like there's a much more direct connection between your wrist and the rear tire.

Second, it's more adjustable. There are adjustments for the throttle position at which the accelerator pump kicks on and kicks off. The needle has notches and a circlip on it, and there are multiple needles available as well. There are needle jets, too, in addition to the standard pilot and main jets.

But probably the nicest feature for a dyno junkie is that little plug on the bottom of the carburetor. Jet changes take a minute or two instead of 15 minutes.

I'll repeat this test at some point in the future with a much more modified bike, to see if the carb doesn't bring more to the party.

Aaron Wilson
NRHS

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Shot_Gun
Posted on Thursday, February 28, 2002 - 06:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
I would be interested in seeing that!Keep us posted please!
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Pammy
Posted on Thursday, February 28, 2002 - 06:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Cycle-Rama did that test(for an un-named entity) on a VERY modified motor and did not find alot of variation either. We love the Mikuni for all the reasons stated in the above post. The CV is very user friendly.
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Blake
Posted on Friday, March 01, 2002 - 02:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
VERY interesting! Thank you for taking the time and effort to post that Aaron.
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Steveb
Posted on Friday, March 01, 2002 - 11:26 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Aaron,

Were all the Mikuni dyno runs done with the CV a/c adapter ring on? I "think" the airflow past the adapter into the carb inlet would be dirty, and a run without the adapter and w/ or w/o a velosity stack would produce better results. During a bit of down time, I recut one of my adapters to please my eye, and it SOP seemed to improve performance. I enlarged and lowered the hole (sort of like matching ports) and reshaped it similar to a venturi ring. The stock adapter ring looks really cobbish to me and wondered if you had made any scientific observations.
TIA,
Steve
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Aaron
Posted on Friday, March 01, 2002 - 11:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Testing was done with the adapter for the CV style air cleaners. Without that adaptor ring, there's no way to bolt the carb to the motor, so I don't see the value of such a test. No, I never tried making mods to it.
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Captainkirk
Posted on Thursday, November 13, 2003 - 12:35 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Aaron (or anyone else chime in!)
New to the site. So much info in the 'vault, it's too much to digest at once. I've got a stock '99M2 with K&N in the Helmholtz and have a long list of mods planned... but we'll go through this one at a time. Tonight's topic- INDUCTION!}
1) Read your report on the Forcewinder. Still think it's better than the stock breadbox or Hypercharger? It's definitely the best LOOKING system on the market. How do you compare it to a Forcewinder-type filter on the stock snorkel? Will a Screamin'Eagle for a Sportster (centerpunched) give you the knee clearance (I kind of doubt it). The Buell race cleaner, in addition to being absurdly expensive, has been discontinued as of 2 weeks ago, according to my local dealer. I'm not a big C/F fan anyway. I tend to put function over form anyway. Comments from the peanut gallery?
2) Carb- read your plug for the HSR42-11 kit. Right now I'm running CV40 w/Thunderslide. Am I buying $300.00 worth of PERFORMANCE or is my money better spent elsewhere on the list? Thanx- CK
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Djkaplan
Posted on Tuesday, November 18, 2003 - 02:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
I sat on an M2 with a center mounted ham can filter (made for a Sportster), and it did indeed hit my knee. I'm running a Forcewinder on my 2000 M2 and I am very pleased with it.
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Captainkirk
Posted on Friday, November 21, 2003 - 01:10 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
DJ- Thanks for the info. I kinda thought it would. Appreciate your response. ck
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Jonsbuell
Posted on Sunday, June 13, 2004 - 09:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Hey how tall are you guy's..? I would like to change out the bread box M2 air filter for something more streamlined i am only 5ft7in but do not want knee hitting sportster style ham can
it look's like i have plenty of room...with 29 inch inseam Thanx J.B.
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Djkaplan
Posted on Sunday, June 13, 2004 - 10:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
You might be able to get away with it - 34 inch inseam here.
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Blake
Posted on Monday, June 14, 2004 - 08:51 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
John,
For the long legged, I recommend using a Forcewinder for optimum knee clearance. My knee hit the ham can style filter cover on my '97 M2, even hit the cover on the Bartel's CF intake cover. The Forcewinder or stock intake are the only ones not pushing my knee outboard more than I'd like.

Back on topic?
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Jonsbuell
Posted on Sunday, June 20, 2004 - 04:38 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Does any one have part number for 45 idle jet for CV-40 or stocker with black top that is a cv-40...????? for 00/M2 Thanx J.B. also does carb need to be pulled to do this, guess i will have to break down and buy some metric hex T handles to remove air cleaner backing plate Thanx all!
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Captainkirk
Posted on Monday, June 21, 2004 - 12:59 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
They're not metric, if I recall correctly.
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Aesquire
Posted on Monday, June 21, 2004 - 02:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
The part # for jets can be problematic. It's a part usually ordered from a discount catalog. ( my dealer had to order jets for me) Not a real issue, just ask for a 45 idle jet for a CV-40.

http://www.nightrider.com/biketech/hd_cv_mods.htm

http://www.nightrider.com/biketech/carbadjust.htm

see above for decent instruction/diagrams. I suggest the jets #'s noted in the Knowledge Vault here at badweb. I think it's easier with carb off. Take your time, it's not that hard. ( I did it)
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Captainkirk
Posted on Sunday, October 24, 2004 - 10:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Just as I feared back then, the CF air cleaner DOES hit my knee. I'll either get used to it or $#!5can the CF hamcan.
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Benm2
Posted on Tuesday, October 26, 2004 - 09:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Gee, the carbon hamcan doesn't really bother me. I had a wear spot on the stock airbox from my right knee, and sure enough the hamcan's there too. The only problem I've noted so far is a tendency to brace myself against it when braking hard for lefts.
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Benm2
Posted on Tuesday, October 26, 2004 - 09:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Captain, has the engine been reassembled? Where's the dyno chart!?
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Captainkirk
Posted on Tuesday, October 26, 2004 - 10:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Ben,
Yes....and it runs like a raped ape!(See my posting in the Old School Buell section). As for the dyno chart....I'm sitting on it!LOL
The hamcan only hits my knee enough to irritate me, not really interfere with my riding. Just one of those little annoyances...like a toothache.
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Captainkirk
Posted on Monday, April 25, 2005 - 12:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Of interest to HSR buyers;
I purchased the HSR42-11 kit; this is specifically set up for Sportster/Buell applications and uses the stock cables and choke cable. According to the parts breakdown in the back of the tuning/installation guide, this carb kit is supposed to come with a size #20 pilot jet for the Sportster (HSR42-10) and #25 pilot jet for the Buells. The kit I ordered WAS the 42-11 but for some reason had the #20 pilot jet installed. Moral of the story: check before you install it. You'll probably have to do some tuning anyway, but the 20 is way to lean for the Thunderstorm Buells out of the box. You'll have to pull the bowl off to get to the pilot; the main jets can be changed through the bowl plug.
I went from 20 to 25, 27.5, now to 30 and I'm waiting for a break in the weather to try out the 30.
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Kahuna
Posted on Monday, April 25, 2005 - 10:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Thanks for the info Captainkirk, I actaully just installed a Mikuni (thanks to Al @ American Sport Bike), and i've noticed that it needs LOADS of choke (something my CV didn't need much of) when cold to get it going. I should of pulled the slow jet when i installed it - I guess i'm gonna have to pull it off again...
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Kahuna
Posted on Monday, April 25, 2005 - 10:29 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Speaking of HSR42's, I Dynoed my bike over the weekend. Its an S1W, Force Intake, Buell Race Header/Muffler/Ignition, stock Mikuni (assuming 25/160 jet combo).

What do you guys think? the torque numbers look really good, but i have a feeling HP could be more?

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Captainkirk
Posted on Tuesday, April 26, 2005 - 12:03 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Kahuna;
I don't know...the numbers don't look that bad considering you're probably running the Lightning heads and pistons. I experienced (actually am STILL experiencing) the whole "choke" thing...and the richer I go, the better it runs. I'm up to a 30 now, but haven't had time for a test hop yet. You don't have to pull the carb to rejet the pilot. It's sorta a PITA, but if you pull the breather bolts and mounting bracket, you can pop the carb out of the spigot far enough to get at the bowl screws with a long Phillips. Caution: they are SOFT so use a screwdriver with a good tip and dip the tip in a little valve grinding compound for a little extra "bite". If they strip anyway, try tightening a little to break 'em loose, then back them out. Works every time. Use anti seize when you reinstall them and don't be a gorilla.
You didn't mention cams....stock?
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Rick_a
Posted on Wednesday, April 27, 2005 - 01:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
S1W's have Thunderstorm heads.
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Captainkirk
Posted on Wednesday, April 27, 2005 - 11:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
It's AMAZING the things I learn here every day. Thanks for the info, Rick. Did the S1W's first come out in '98, then? I thought it was late '97?
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Kahuna
Posted on Thursday, April 28, 2005 - 06:37 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
'98 had both S1's and S1W's - that was the only year for S1W
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Lake_bueller
Posted on Thursday, April 28, 2005 - 04:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
I think those HP numbers look a little low for the components. The force intake does nothing to help (probably hurts) power. I've heard guys that are pulling closer to mid-90'sHP with that set-up.

I've been meaning to get my S1W on the dyno. I'm running a Mikuni with the race aircleaner, stock header, Daytona Boss 3" exhaust and Dyna programable ignition.
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