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A high speed chop will give you the most definitine answer to jetting questions when it comes to high rpm passes. I do it every time after I have idle and synch correct. My 79SF will not go past 8 grand in top gear. I have chopped it and it shows as lean then. I am going up one on my mains to see if that corrects it. Just have not yet done so. JAT for you to think about and maybe investigate.
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2-79 XS1100 SF
2-78 XS1100 E Best bike Ever
80 XS 1100 SG Big bore kit but not fully running yet.
Couple of more parts bikes of which 2 more will live! -
No stock filter to try, it came with a uni filter that I didn't like. Bottom of the airbox is drilled and the snorkle is cut down so I guess that could lean it out some.
I will do the chops just didn't want to carry a ratchet, socket, and extension with. I certainly won't be testing out my top end in 5th gear though...
I was at around 70mph in 2nd at 8000 speed limit was only 45
Nathan
KD9ARL
μολὼν λαβέ
1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters
Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner
In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore RooseveltComment
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I understand what your saying but he says he can't hit redline after getting out of 1st gear if I understand correctly. With stock jets it should be running a lot better with his basically stock setup. IMO
He is running the same jets in the same carbs and engine I am except I'm running a Mac 4 into 2 w/turnouts. I don't lean out until over the century mark in 5th and then it's only noticable when the temps are high.
And, I also have a 850FD so I'm pulling harder.Greg
Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”
― Albert Einstein
80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.
The list changes.
Comment
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Yes, you are understanding correctly Greg.Nathan
KD9ARL
μολὼν λαβέ
1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters
Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner
In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore RooseveltComment
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Just sayin' ...I run the uni in both bikes and so far I like it.Originally posted by natemoen View Post
That restricted exhaust idea just came to me as I was typing that one post. What do your mufflers look and sound like. Are they flowing good? Strange things can happen to mufflers when a bike sits for a time.Greg
Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”
― Albert Einstein
80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.
The list changes.Comment
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Ok we have a lot of unused roads around here that are very straight. Matter of fact is that if we have to turn more than once in 50 miles it is a twisty. Still sounds to me like a starvation issue on the high end. No better way than to take a socket and wrench with you and do a check. May possibly be other issues for sure but that is where I would look first. Everything from elevation to fuel could be an issue but a high speed chop would be definitive. YMMV2-79 XS1100 SF
2-78 XS1100 E Best bike Ever
80 XS 1100 SG Big bore kit but not fully running yet.
Couple of more parts bikes of which 2 more will live!Comment
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I will do the chop.
The exhaust seems to flow fine. Pretty strong flow out the back end.
Anyone know where to get new gasket for the 3 slip joints on the stock exhaust?
Let's just say UNI filters melt when you backfire into the airbox. Not as much of an issue with k&n or stock filters.Nathan
KD9ARL
μολὼν λαβέ
1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters
Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner
In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore RooseveltComment
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It's not supposed to backfire.Originally posted by natemoen View Post
One other thing that just crossed my mind. Are you certain you got the cam sprockets on right and not 180º out when you had the head apart? They can go on 2 ways and one is wrong. Actually 4 ways and 3 are wrong.Greg
Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”
― Albert Einstein
80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.
The list changes.Comment
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Don't know about the cams, how do I tell?Nathan
KD9ARL
μολὼν λαβέ
1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters
Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner
In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore RooseveltComment
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You obviously know about the alignment marks.
On the gears there is markings around the bolt holes. One is rounded and the other has a little point at the top. The hole with the point goes at the bolt closest to the timing dot on the cam, facing AWAY from the dot on the cam.
Understand?
If those gears aren't on right for starters the timing marks won't align correctly but they will be close. And, your engine won't run right because the cam timing is off.
If you didn't know that when you put it back together it would have been real easy to get them wrong and you would never know it.Greg
Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”
― Albert Einstein
80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.
The list changes.Comment
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Knew about the timing dots but the bolt marks no. If I remember correct, I marked the gears and cams for myself when I had them off, but who said it was right when I took it apart...
Guess I will have to check.Nathan
KD9ARL
μολὼν λαβέ
1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters
Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner
In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore RooseveltComment
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Not saying that's what it is but if your not sure it's a possibility.
A good opportunity to recheck valve clearances again after running it a bit too.
Do you recall if the timing marks lined up well?Greg
Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”
― Albert Einstein
80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.
The list changes.Comment
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Don't have many miles in it since I did everything. Shims better still be good! I feel as though the dots lines up perfect.Nathan
KD9ARL
μολὼν λαβέ
1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters
Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner
In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore RooseveltComment
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You can try what Rasputin says because all that will take is some time but from what I've gathered from you posts and going by your setup I personally don't think it's a fuel problem.
Myself, I would check everything I worked on before, before I would go changing anything else. But, that's just me.
Besides, the main needles thing has me thinking something else may be askew also.Greg
Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”
― Albert Einstein
80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.
The list changes.Comment
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So, your saying tear it back down to the frame and redo everything.......Originally posted by BA80 View Post
Nathan
KD9ARL
μολὼν λαβέ
1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters
Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner
In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore RooseveltComment
Comment