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xs650 > > High Performance Modifications > > Top End Work > > stock carb question... |
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6fidi Full Member
Joined: Oct 19, 2008 Posts: 21
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Posted: January 23, 2009, 11:15 pm Post subject: stock carb question... |
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Does anyone one know the best set up for the stock carbs when running straight pipes.
Will straight pipes make enough difference to require a jet change?
Thanks.
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oldskoolcool Full Member
Joined: Sep 08, 2007 Posts: 372
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Posted: January 23, 2009, 11:19 pm Post subject: Re: stock carb question... |
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depends on elevation etc. I had to go up on the Mains one size on my 78. and thats it. i tried upping the needles 1 and it was super boggy. stock pilots too.
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Romer Full Member
Joined: Oct 22, 2008 Posts: 49 Location: Deep in the South - Alabama
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Posted: January 23, 2009, 11:36 pm Post subject: Re: stock carb question... |
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Check out the "Carb guide" on "xs650 garage". They have a good jetting section. But don't ask those guys too many questions.....they are kinda testy.
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xsleo Full Member
Joined: Oct 28, 2007 Posts: 1528 Location: Earlville NY
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Posted: January 24, 2009, 1:48 am Post subject: Re: stock carb question... |
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most of the guys on 650garage are good folks, just a few are testy.
_________________ "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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xs1961 650Rider Supporter
Joined: Apr 23, 2007 Posts: 1808 Location: uk
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Posted: January 24, 2009, 9:40 pm Post subject: Re: stock carb question... |
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No such thing as a 'best' set-up...All motors are individual & can be affected by the state of the internals rings/compression/ignition etc. as well as sea level/ temperature ..blah blah... Start rich (safe) and work down from there... Best to junk stock carbs if running open or unrerstricted pipes and/or non standard airfilters ..
_________________ 1 running 650
2.5 bikes in bits,
no time,
gradually losing intrest... God help me... |
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5twins Full Member
Joined: Aug 05, 2006 Posts: 1616
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Posted: January 24, 2009, 11:37 pm Post subject: Re: stock carb question... |
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I'll admit, I get testy, especially when people want to run straight pipes. An engine really needs some back pressure in the exhaust to run best. These bikes are hard enough to jet right with aftermarket mufflers and filters. If you want tips for straight pipes my only advice would be to ask on some Harley list. The bottom line is straight pipes don't work very well no matter how you jet. If they did, we'd all be running them. In my opinion, the best exhaust set up for a twin is a 2 into 2 with long tapered megaphones ...... Conti's come to mind ..... probably the best sounding and most beautiful muffler ever made. And if you have to ask "What's a Conti?", well then run those straight pipes. Google Conti Mufflers, you'll see what I mean.
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xsleo Full Member
Joined: Oct 28, 2007 Posts: 1528 Location: Earlville NY
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Posted: January 25, 2009, 3:25 am Post subject: Re: stock carb question... |
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i agee 5twins. i have seen many bikes that ran great with a stock or slightly less restiction system. then someone screws them up with drag pipes. all the owners do is adjust the carbs and never get them right. but loud pipes save lives, or so they say. i have found that a good exhaust system can increase the low to mid range running and even help the top end some. and having a good low range throttle responce has gotten me out of more situations than loud pipes. i do like the looks of a drag pipe and there are systems for other bikes that look like drag pipes but have the right design to give good all over performance. so i think some one can build a good performing drag pipe looking system if they wanted to.
_________________ "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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cpotts454 Full Member
Joined: Jun 21, 2007 Posts: 447 Location: Louisville, KY
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Posted: January 25, 2009, 8:14 am Post subject: Re: stock carb question... |
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hey 5twins, I will agree to run Conti Mufflers when you agree to buy them for me.
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xs1961 650Rider Supporter
Joined: Apr 23, 2007 Posts: 1808 Location: uk
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Posted: January 25, 2009, 8:50 am Post subject: Re: stock carb question... |
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I had Contis on my 1000S Guzzi once...Luverly...& pricey..
_________________ 1 running 650
2.5 bikes in bits,
no time,
gradually losing intrest... God help me... |
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kyle1911 Full Member
Joined: Nov 10, 2008 Posts: 67 Location: East Wenatchee, Wa.
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Posted: January 25, 2009, 1:31 pm Post subject: Re: stock carb question... |
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Yeah...Rode a friends 1980? 79? Can't recall the year Hailwood Replica Ducati. Had Conti pipes on it, and some other performance goodies. I am not a big Ducati fan, but that thing was all about mechanical music. Back on topic... I wonder how much the shape of the muffler matters. Unless you are running with no baffles, it seems like it should not matter much. Megaphone, cone, reverse cone, etc. If they are all running the same baffle core, how does the engine know the difference? My STILL unfinished streetracker will put this to the test. 1 3/4" headers, reduced to 1 1/2" at both ends. The megaphones are straight, with only a couple of inches of steel wool at the end. "See, Officer, there is packing in these mufflers!" I agree that backpressure is required on some engines, sometimes, in some ranges. If megaphones are unbaffled, I can visualize some expansion chamber effect, with length being critical... I never pursued math, but I do enjoy studying this stuff. A large bucket of compromise, all the time. Check out the King's exhaust in this old pic. Almost every pic I have of his old bikles, the pipes are radically different. Yamaha must have been really pulling out the stops on pipe research. These almost look like servo controlled valves...??? Maybe i am seeing things, maybe some of the "Old hands" on here know? I am curious!Kyle
_________________ There comes a time in every man's life, when he must spit on his hands, hoist the black flag, and start slittin' throats. |
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Romer Full Member
Joined: Oct 22, 2008 Posts: 49 Location: Deep in the South - Alabama
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Posted: January 25, 2009, 4:22 pm Post subject: Re: stock carb question... |
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5twins, what do you think about JC whitney cheapies and stock jetting? Do you think that would give enough back pressure?
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6fidi Full Member
Joined: Oct 19, 2008 Posts: 21
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Posted: January 31, 2009, 12:59 am Post subject: Re: stock carb question... |
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5twins wrote: |
I'll admit, I get testy, especially when people want to run straight pipes. An engine really needs some back pressure in the exhaust to run best. These bikes are hard enough to jet right with aftermarket mufflers and filters. If you want tips for straight pipes my only advice would be to ask on some Harley list. The bottom line is straight pipes don't work very well no matter how you jet. If they did, we'd all be running them. In my opinion, the best exhaust set up for a twin is a 2 into 2 with long tapered megaphones ...... Conti's come to mind ..... probably the best sounding and most beautiful muffler ever made. And if you have to ask "What's a Conti?", well then run those straight pipes. Google Conti Mufflers, you'll see what I mean. |
I'll admit I get testy with selfrightcious angry little men who have to lend an air of attitude. If you want to express your opinion do it like an adult and not like an angry little boy. get a personality. And if you have to ask.."Whats a personality?...well then run that mouth cuz nobody gives a bleedin f***.
Thanks to all of you who answered with tact and respect, it is greatly appreciated.
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5twins Full Member
Joined: Aug 05, 2006 Posts: 1616
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Posted: February 1, 2009, 2:41 am Post subject: Re: stock carb question... |
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6fidi .... I may be angry and I may be little ..... but 19 posts and now you're an expert on 650s or forums in general? I don't recall using the "F" word in my post but I think I saw it in yours. Good luck jetting your carbs, you're gonna need it. I stand by what I said. Straight pipes are a racing thing and have no business being on the street. If you're so offended I would think you might consider the offense your pipes might have to the general public. Motorcyclists have a bad enough image as it is without guys running straight pipes on purpose.
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650skull Support Staff
Joined: Jul 19, 2007 Posts: 1186
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Posted: February 1, 2009, 5:20 am Post subject: Re: stock carb question... |
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[quote 6fidi] I'll admit I get testy with selfrightcious angry little men who have to lend an air of attitude. If you want to express your opinion do it like an adult and not like an angry little boy. get a personality. And if you have to ask.."Whats a personality?...well then run that mouth cuz nobody gives a bleedin f***.
Thanks to all of you who answered with tact and respect, it is greatly appreciated. |
Take a chill pill
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xsjohn Full Member
Joined: Jul 30, 2006 Posts: 5857 Location: North Carolina USSA
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Posted: February 1, 2009, 4:28 pm Post subject: Re: stock carb question... |
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Been staying out of this but you know me............
I personally don't care what people do to these.........but after doing this thing for 45 years or so I won't change anything unless I am convinced that it makes it better and or safer........some of the crazy changes I see just to make a fashion statement to me don't really fit into any catagory in my mind at all...........call me an ole fuddy duddy if you want.....but I don't wear ass paints or face ornaments either........
Like...taking the front fender off.......using little brakes on the front.......bobbing the rear fender so it splatters your back.....removing the rear springs so it destroys your spine and maybe even throws you ass off if you hit something in the road.....and running straight pipes so you go deaf and bug the hell out of everyone including the socialist that will use the racket to shove new laws up your ass...AND MINE...and the list goes on and on........
And some of the changes I've seen truly look stupid.......and some I really like....
(Quote...Richard Prior....and he didn't really follow his own quote)
""""""No such thing as an old fool....cause you don't get old by being a fool""""""
xsjohn
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6fidi Full Member
Joined: Oct 19, 2008 Posts: 21
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Posted: February 1, 2009, 5:53 pm Post subject: Re: stock carb question... |
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5twins wrote: |
6fidi .... I may be angry and I may be little ..... but 19 posts and now you're an expert on 650s or forums in general? I don't recall using the "F" word in my post but I think I saw it in yours. Good luck jetting your carbs, you're gonna need it. I stand by what I said. Straight pipes are a racing thing and have no business being on the street. If you're so offended I would think you might consider the offense your pipes might have to the general public. Motorcyclists have a bad enough image as it is without guys running straight pipes on purpose. |
Never said I was an expert. I ask a question to get answers. Everything you said was true. My point is, why express it with venom and smart ass comments.
you could have just passed on your knowledge with out all the attitude.
Ya reap what ya sew.
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xsjohn Full Member
Joined: Jul 30, 2006 Posts: 5857 Location: North Carolina USSA
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Posted: February 1, 2009, 7:21 pm Post subject: Re: stock carb question... |
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Hey man welcome to the groop......don't pay much attention to us.....we are all about half a bubble off for even riding motorcycles.....
xsjohn
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woodman Full Member
Joined: Oct 12, 2008 Posts: 256
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Posted: February 13, 2009, 5:30 pm Post subject: Re: stock carb question... |
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What we used to do in the old iron head Sportster days was drill the drag pipe an inch or so from the end for a 1/4 inch screw. Put the screw in so it sticks up about 3/4 inch, put 6 or 8 washers on it and try it. Varying the washers will help you get the carb to work better with some back pressure without losing the look you want. I cant take the noise any more but Ive been thru that stage and thats what we did back then for what ever its worth. You will lose power {with drag pipes}but if thats what you want its a cheap fix
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6fidi Full Member
Joined: Oct 19, 2008 Posts: 21
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Posted: February 24, 2009, 4:26 pm Post subject: Re: stock carb question... |
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woodman wrote: |
What we used to do in the old iron head Sportster days was drill the drag pipe an inch or so from the end for a 1/4 inch screw. Put the screw in so it sticks up about 3/4 inch, put 6 or 8 washers on it and try it. Varying the washers will help you get the carb to work better with some back pressure without losing the look you want. I cant take the noise any more but Ive been thru that stage and thats what we did back then for what ever its worth. You will lose power {with drag pipes}but if thats what you want its a cheap fix |
Thanks man! I've heard of this before and will give it a try.
I'm building this bike for fun, and to have a certain Detroit bros. feel to it.
It's ok if it looses power.
I have 2 other bikes that have plenty.
Thanks again!
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woodman Full Member
Joined: Oct 12, 2008 Posts: 256
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stoneam2006 New Member
Joined: Feb 24, 2009 Posts: 5 Location: NY
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Posted: May 4, 2009, 2:19 pm Post subject: Re: stock carb question... |
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i have a question my left carb is leaking gas out of the air cleaner i am running k&n air filters and i have tried to different sets of carbs one set is completly rebuilt and the other is not but both have same exact problem.. what are some possibilities for this?
_________________ Aaron (Alfred State Welding) |
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dpmphoto Full Member
Joined: Apr 18, 2007 Posts: 485 Location: syracuse NY
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Posted: June 18, 2009, 1:26 am Post subject: Re: stock carb question... |
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All this pipe talk and you left out length and diameter very important stuff to those that use to tune these for a living.
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