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xs650 > > Custom Work: Chop, Bob, Cafe and Flattracker - Streettracker > > Chopper jobs > > single carb |
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lar55 New Member
Joined: Jul 07, 2007 Posts: 9 Location: ill
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Posted: January 18, 2008, 6:38 pm Post subject: single carb |
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Hey guys . Need to know were to get a single carb manifold for my 650 or how can I make one . And how much do you drill the jets out to make them work . I'am not looking for speed . Just something simple . Thanks Lar
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royfisk Full Member
Joined: May 24, 2006 Posts: 1597 Location: winchester, new hampshire usa
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Posted: January 18, 2008, 6:46 pm Post subject: Re: single carb |
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I dont know of any comercially available manifolds for this purpose. And have not seen many customs done that way. The 2 that I did see were both useind s&s carburators. and homemade exhaust pipe manifolds. The s&s carb allows for needle adjusting screws and changeable main jets. They worked alright but not vm mikuni right.
_________________ build them , ride them, tear them down, rebuild them, ride them, etc. etc. etc.. They only get better and better |
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mo650chopper WebMaster
Joined: Mar 13, 2005 Posts: 544 Location: Lonedell, Missouri
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Posted: January 19, 2008, 10:05 am Post subject: Re: single carb |
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I have a question on how you would know the proper size carb. Even though your only drawing air through carb to one cylinder at a time I belive one 34MM would be too small but it wouldn't need to be twice the size either????
_________________ Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body. But rather
to skid in sideways, hand grip in hand, body thoroughly used up, totally worn out and screaming "WOO-HOO what a ride!" |
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royfisk Full Member
Joined: May 24, 2006 Posts: 1597 Location: winchester, new hampshire usa
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Posted: January 19, 2008, 10:23 pm Post subject: Re: single carb |
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well mo the harley sportsters use to run just fine on 36 mm mikunis (VM) carbs. they were 900 and 1000 cc's . The smaller carbs will flow enough cfm to run these engines its the jetting that would get tricky. Just as our beloved 650's will run fine on all 3 size mikuni's . My guess would be a 38 mm mikuni jetted properly would run both cylinders fine, I also dont think there would be major jet changes. where the trick would be is getting a manifold that would distribute the fuel evenly, That too may not be as important as I think cause Ive seen some pretty trick intakes on bikes before and runners were not always even. but my main question is what would be the purpose of this? What is expected to be gained?
_________________ build them , ride them, tear them down, rebuild them, ride them, etc. etc. etc.. They only get better and better |
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mo650chopper WebMaster
Joined: Mar 13, 2005 Posts: 544 Location: Lonedell, Missouri
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Posted: January 20, 2008, 12:14 am Post subject: Re: single carb |
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People do alot of things to motorcycles without much purpose in mind other than being differnt or adapting something they have laying around just to make it work. Being an old Harley guy I just like having to mess with one carb instead of 2. Kinda like a V8 4 barrel on a smaller scale. I've got my 80 XS running good on a couple 78 carbs so I'm good for now. Who knows what crazy idea or parts I'll come up with in the future. I doubt there would be any performance gain.
_________________ Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body. But rather
to skid in sideways, hand grip in hand, body thoroughly used up, totally worn out and screaming "WOO-HOO what a ride!" |
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funranger 650Rider Supporter
Joined: Feb 18, 2005 Posts: 18
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Posted: January 20, 2008, 1:24 am Post subject: Re: single carb |
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I have seen triumph and BSA kits to use one carb may want to look there.
_________________ To the victor go the spoiles |
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pumps 650Rider Supporter
Joined: May 29, 2007 Posts: 1993 Location: Kansas City, Missouri, U.S.A.- 1977 XS650 "D" Standard
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Posted: January 20, 2008, 2:08 am Post subject: Re: single carb |
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xs650temp.proboards29....593&page=3
Some pics way down.
_________________ You don't HAVE to be crazy to run into burning buildings, but it HELPS!
On an XS you won't pass yourself on the road everyday.
My Bikes |
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xsjohn Full Member
Joined: Jul 30, 2006 Posts: 5857 Location: North Carolina USSA
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Posted: January 20, 2008, 5:36 am Post subject: Re: single carb |
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You could never balance the cylinder temperatures........
John
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Shannon60 Full Member
Joined: Nov 12, 2007 Posts: 170 Location: Neenah, WI
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Posted: January 20, 2008, 10:32 am Post subject: Re: single carb |
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Q for you xsjohn why are the cylinder temps uneven?
_________________ I will make any part fit any bike as long as its in good taste, or absolutely absurd |
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royfisk Full Member
Joined: May 24, 2006 Posts: 1597 Location: winchester, new hampshire usa
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Posted: January 20, 2008, 11:06 am Post subject: Re: single carb |
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triumphs, bsa's, nortons, ALL had single carburator models, now that I think about it they also used same bore carburators. little differant jetting. Now if you were to desire crazzy ness why not dual carbs, and manifolds going around the cylinders so air is comming in from the front of the engine. COLD AIR . scrad effect, forced air induction. My neighbor has a goldwing with a 400cfm holly four barrel on it. Been useing it now for onward 10 years . He had carburator problems and for those who havent been there goldwings are a royal pain in the a___ to work on. I once was playing with the idea of making up a manifold for a buddy of mine to adapt 8 mikuni 34mm vm carburators to his 350 chevrolet street rod. More for a trick look that neither of us have seen done before. After many of beers and finding obsticals that we would incounter such as enrichinr linkage, throttle linkage, manifold manufactureing, etc ( before I had welders, and pipeing knowledge) we parked the idea. But I still think it would be trick looking on a 32 ford open cowel street rod with 8 air filters . So I guess this single carb thing is not as crazzy as it first souds. think your haveing problems now syncrhonseing 2 carbs try 8.
_________________ build them , ride them, tear them down, rebuild them, ride them, etc. etc. etc.. They only get better and better |
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mo650chopper WebMaster
Joined: Mar 13, 2005 Posts: 544 Location: Lonedell, Missouri
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Posted: January 21, 2008, 10:09 am Post subject: Re: single carb |
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Maybe a couple hilborn fuel injectors like my buddy had on his 341 CI Desoto Hemi, 11.7 second quarter mile times, That was a cool engine.
On a more serious option maybe a CV 40MM HD Keihin from a 883 sportster? Should be easy to find one cheap I would think. The stock carb was always one of the first parts I'd remove when I had HD's.
_________________ Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body. But rather
to skid in sideways, hand grip in hand, body thoroughly used up, totally worn out and screaming "WOO-HOO what a ride!" |
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mo650chopper WebMaster
Joined: Mar 13, 2005 Posts: 544 Location: Lonedell, Missouri
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Posted: January 21, 2008, 10:28 am Post subject: Re: single carb |
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Kinda intrigued by the dual carb idea Roy being with the stretch I have on my bike gives me a lot of room to work with in that location. Wouldn't the long runners required, probably a foot or so long, make tuning tough?
_________________ Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body. But rather
to skid in sideways, hand grip in hand, body thoroughly used up, totally worn out and screaming "WOO-HOO what a ride!" |
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xsjohn Full Member
Joined: Jul 30, 2006 Posts: 5857 Location: North Carolina USSA
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Posted: January 21, 2008, 10:34 am Post subject: Re: single carb |
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Have we been forgetting the hot right cylinder......or just ignoring it...does keep you from getting down the road farther....been trying to stay out of this but it is getting harder.......FI would be cool on each cylinder if they could be individually mapped......at least for me.....
John
Last edited by xsjohn on January 29, 2008, 6:02 pm; edited 1 time in total |
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lar55 New Member
Joined: Jul 07, 2007 Posts: 9 Location: ill
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Posted: January 21, 2008, 10:34 pm Post subject: Re: single carb |
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Thanks for all your in put however I have gotten no closer to a manifold . There was a guy bob scogin who made one and had good luck with it . He also moved the back bone back a little . I guess I 'am not looking for speed . I would like something I can depend on and start easy. I love the look of the old trimph. 500 with one carb and what a nice bike to ride. The main reason for a manifold is I have no carbs now . I thought I would start over with something different, Thanks Guys . I think I will try to make one .
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xsleo Full Member
Joined: Oct 28, 2007 Posts: 1528 Location: Earlville NY
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Posted: January 22, 2008, 5:17 pm Post subject: Re: single carb |
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with fuel injection, if you had a system for each side, injector, o2 censor, brain. you could have them auto tune. that way each side adjust to what each side needs. it would cost alot ,but might work.
_________________ "You live more in five minutes on a bike than most people do in there whole life"
'75 XS650B with a 79 dual disc front end, rear disk brake, Chrysler reg, Radio Shack rect, LED tail/ brake and turn signals. |
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xsjohn Full Member
Joined: Jul 30, 2006 Posts: 5857 Location: North Carolina USSA
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Posted: January 23, 2008, 1:00 am Post subject: Re: single carb |
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Can do that with 2 carbs too...........
John
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xsleo Full Member
Joined: Oct 28, 2007 Posts: 1528 Location: Earlville NY
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Posted: January 23, 2008, 1:30 am Post subject: Re: single carb |
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true, but when you change pipes, air filters, cams, head work,poor gas, altitude, hot, cold , most any changes the system would tune accordingly. it would make changes alot easier.
_________________ "You live more in five minutes on a bike than most people do in there whole life"
'75 XS650B with a 79 dual disc front end, rear disk brake, Chrysler reg, Radio Shack rect, LED tail/ brake and turn signals.
Last edited by xsleo on January 23, 2008, 1:49 am; edited 1 time in total |
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xsjohn Full Member
Joined: Jul 30, 2006 Posts: 5857 Location: North Carolina USSA
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Posted: January 23, 2008, 1:35 am Post subject: Re: single carb |
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May end up with a Goldwing before that's over with.....
xsjohn
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