G oog le BadWeB | Login/out | Topics | Search | Custodians | Register | Edit Profile

Buell Forum » Old School Buell » M2 Cyclone » Archive through September 26, 2015 » CV Carburetor Modifications « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Tyler7686
Posted on Friday, March 13, 2015 - 09:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Has anyone done these mods to their carbs? Thoughts?

https://www.youtube.com/watch?v=iTPPP8jkje4
Top of pagePrevious messageNext messageBottom of page Link to this message

Bluzm2
Posted on Friday, March 13, 2015 - 10:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Tyler, yes many of us have done mods like this.
The most common mods are main jet 190 or 195.
Pilot jet is a 45.
Remove low speed mixture plug and set screw to 2 1/2 turns out.
The slide modifications don't do much. I've done it and also left it alone. The one thing that does help though is the shim under the needle.
Most use a .050" shim. You can find them at a hobby store that has RC car parts. They are a common shim used in some of the motors and such.
I've never filed the slide or clipped the springs.
These simple mods totally change the way your Cyclone runs. No more Keihn cough and low speed "farts".

Your bike is old enough now that you want to really check the slide diaphragm. They do get old and start breaking down. Check the rubber carefully. Same goes for the accelerator pump diaphragm.
Top of pagePrevious messageNext messageBottom of page Link to this message

Fxdrydr
Posted on Saturday, March 14, 2015 - 02:36 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I just changed out to 45 and 195 jets, a lower pedestal, an external air bleed screw and a new accelerator pump diaphram. Didn't drill out the hole. Easy-peasy.

Got parts here - cv performance

They have great instructional vids too.
Top of pagePrevious messageNext messageBottom of page Link to this message

Xldevil
Posted on Saturday, March 14, 2015 - 04:06 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I've drilled a small hole in the lower half of throttle plate,
2mm,on my Thunderstorm upgraded Sportster.
The same does Mr.Wood to his CVs.
It smoothed out the idle and gave better response right
from idle.
Can really recommend that mod,besides all the others mentioned.
Top of pagePrevious messageNext messageBottom of page Link to this message

Buellistic
Posted on Saturday, March 14, 2015 - 06:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

CV CARB. Class 101, just PM me for a copy ...
Top of pagePrevious messageNext messageBottom of page Link to this message

Dave_02_1200
Posted on Sunday, March 15, 2015 - 09:16 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I reworked my CV-40 carb per Buellistic's instructions.

It is amazing just how good a CV-40 can be when it is set up right.
Top of pagePrevious messageNext messageBottom of page Link to this message

Imadog
Posted on Sunday, March 15, 2015 - 09:17 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I am interested in more information on drilling out the throttle plate. My carb mods are: #45 Pilot (from #42), Stock #200 main jet, Shimming needle 0.050", new intake gaskets, new carb gaskets and accelerator pump. I had to replace my vacuum slide because I oversized the hole to 9/64" (oops!) and have left it alone this time. I believe my idle mixture is 2-3/4 turns out. My bike is still cold natured for the first 15 minutes, after that it runs really well. What are the pros and cons of drilling the throttle plate? Thanks in advance. Other mods are Force winder intake and V & H slip-on.

(Message edited by imadog on March 15, 2015)
Top of pagePrevious messageNext messageBottom of page Link to this message

Ks2cohawk
Posted on Tuesday, March 31, 2015 - 06:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Does anyone have any advice for jetting a 2002 Buell M2 for a mile high? 5280 feet above sea level. I live in Denver and regularly ride higher elevations. My bike has a Forcewinder intake and a D&D muffler.
It seems to run just fine right now and I've never taken it apart to see what has been done to it thus far. Any suggested starting points?
Top of pagePrevious messageNext messageBottom of page Link to this message

Imadog
Posted on Tuesday, March 31, 2015 - 08:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The higher the elevation, the less fuel is used because there is less oxygen, if the bike pulls strong through all gears and the throttle response is smooth, with no hiccups, you have got the jetting right. If there are issues at different throttle position, this can be corrected through proper jetting and needle position.
Top of pagePrevious messageNext messageBottom of page Link to this message

Imadog
Posted on Tuesday, March 31, 2015 - 08:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Just checked this link http://xlforum.net/vbportal/forums/archive/index.p hp/t-1132332.html I remember riding my 1981 KZ750 from Denver to Vail and I had carb issues over 6500 ft. It has a CV four carb set up (Keihin).
Top of pagePrevious messageNext messageBottom of page Link to this message

Dvc357
Posted on Sunday, April 05, 2015 - 07:46 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks to Buellistic for his thorough step by step insight! +++++
« Previous Next »

Add Your Message Here
Post:
Bold text Italics Underline Create a hyperlink Insert a clipart image

Username: Posting Information:
This is a private posting area. Only registered users and custodians may post messages here.
Password:
Options: Post as "Anonymous" (Valid reason required. Abusers will be exposed. If unsure, ask.)
Enable HTML code in message
Automatically activate URLs in message
Action:

Topics | Last Day | Tree View | Search | User List | Help/Instructions | Rules | Program Credits Administration