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Topped out and cant reach redline in 5th gear... The other night I had a 90's Cadillac walk away from me and it left me wondering (among others) why cant I reach redline in 5th gear? My valve clearances are within spec now and the bike pulls strong in ever gear right to redline except 5th. It just seems to hit a wall and wont pull anymore then about 7300 RPM in 5th. When at WOT does carb sync come into play? Any advice to get the last drop? When I get a change Im going to pull the carbs and check float height.
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Last edited by WMarshy; 07-24-2012, 11:16 AM.'79 XS11 F
Stock except K&N
'79 XS11 SF
Stock, no title.
'84 Chevy K-10 "Big Blue"
GM 350, Muncie SM465, NP208, GM 10 Bolt with 3.42gears turnin 31x10.5 Baja Claws
"What they do have is an implacable, unrelenting presence and movement that bespeaks massive power lurking behind paint and chrome. They don't wail like a screeching ninja, the don't rumble like a harley. They just growl like a spactic, stressed out badger waiting to rip your face off and eat your soul." Trainzz~RIP~ -
Main Jets are the only other idea I have. You really are relying on those jets at that RPM. But float height will make a difference.
Well, spark can play a part, if your coils are slightly weak you could not be getting a hot enough spark to give full power at that point.Life is what happens while your planning everything else!
When your work speaks for itself, don't interrupt.
81 XS1100 Special - Humpty Dumpty
80 XS1100 Special - Project Resurrection
Previously owned
93 GSX600F
80 XS1100 Special - Ruby
81 XS1100 Special
81 CB750 C
80 CB750 C
78 XS750 -
That's about 120 mph Wade. How fast do you want to go?
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.
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I dont know the answer to that question yet Greg.Originally posted by BA80 View PostThat's about 120 mph Wade. How fast do you want to go?'79 XS11 F
Stock except K&N
'79 XS11 SF
Stock, no title.
'84 Chevy K-10 "Big Blue"
GM 350, Muncie SM465, NP208, GM 10 Bolt with 3.42gears turnin 31x10.5 Baja Claws
"What they do have is an implacable, unrelenting presence and movement that bespeaks massive power lurking behind paint and chrome. They don't wail like a screeching ninja, the don't rumble like a harley. They just growl like a spactic, stressed out badger waiting to rip your face off and eat your soul." Trainzz~RIP~Comment
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Drop the ballast!
I think the thing that slows me is the "sprung" weight I carry
Of course I usually only drive no faster than 65 mph!
JohnJohn is in an anonymous city with an Alamo (N29.519227,W-98.678980)
Go ahead, click on the bikes - you know you want to...the electrons are ready.
'81 XS1100H - "Enterprise"
Bob Jones Custom Navy bike: Tkat brace, EBC floating rotors & SS lines, ROX pivot risers, Geezer rectifier, new 3H3 engine
"Not all treasure is silver and gold"Comment
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Even when brand new, these bikes topped out at about 135, and getting that last 10-15 mph took some distance. My '78 could pull to a bit over 135 indicated (probably about 125 actual) in fifth, but it took at least a mile to get the last 10 mph....
This was 1978 when I was still sure I was bulletproof...
Fast, Cheap, Reliable... Pick any two
'78E original owner - resto project
'78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
'82 XJ rebuild project
'80SG restified, red SOLD
'79F parts...
'81H more parts...
Other current bikes:
'93 XL1200 Anniversary Sportster 85RWHP
'86 XL883/1200 Chopper
'82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
Cage: '13 Mustang GT/CS with a few 'custom' touches
Yep, can't leave nuthin' alone...Comment
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100% ditto. Same with my new 79. I did exactly the same thing.Originally posted by crazy steve View PostEven when brand new, these bikes topped out at about 135, and getting that last 10-15 mph took some distance. My '78 could pull to a bit over 135 indicated (probably about 125 actual) in fifth, but it took at least a mile to get the last 10 mph....
This was 1978 when I was still sure I was bulletproof...
It seems to me that asking for more than 120mph on a bike of that age is asking for trouble.
BTW Steve, I feel a poll coming on.......XS1100F 1980 European model. Standard. Dyna coils. Iridium plugs. XS750 final drive (sometimes). Micron fork brace. Progressive front springs. Geezer regulator/rectifier. Stainless 4 into 2 exhaust. Auto CCT (Venturer 1300) SOLD. New project now on the go. 1980 European model.Comment
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The only thing I have to add is something I read on here some time ago. To get the maximum pull out of it, never let the RPMs drop below 5k, even between shifts.1980 XS850SG - Sold
1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).
Whether you think you can, or you think you cannot - You're right.
-H. FordComment
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Pushing a lot of air once you reach triple digits. I had my '03 V-Rod reading 135 and it was a chore to stay on it, forward controls are not made for that! My XS is my work truck, it's not safety tested for those speeds!US Army 1986-1991
1979 1100 Special (on the road after 16 years!)
1983 GS300L (wifes ride)
1985 Super Glide
2012 Super GlideComment
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I've gotten about 125 out of mine in the right conditions. I had to shift down to 4th though because I have the FD mod. In 5th I can only get about 105.
That's a lot of wind resistance for these old carbureted work horses the overcome. They aren't really aerodynamic.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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Easy, just add some n2o! 20mph at the push of a button!BARE BONES CHOPPERS: If it don't make it go faster, you don't need it!
80 XS1100SG(cafe in progress *slowly)Comment
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my 2cents. Even race cars do not pull redline in top gear.
XS max horsepower is at around 7200rpm. Horsepower is what gives you speed. Less weight and no wind would help to go faster.
Were you tucked in over the tank or sitting up like a barn door
PhilLast edited by MaximPhil; 07-24-2012, 08:41 PM.1981 XS1100 H Venturer ( Addie)
1983 XJ 650 Maxim
2004 Kawasaki Concours. ( Black Bear)Comment
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The exhaust you may be running is also a factor in this equation. I have found that 4 into 1 is different than a 4 into 2 for aftermarket exhaust. I had no problem with the 135mph with the stock exhaust but find that my Jardine spaghetti's will run out of steam before that. I still will try another bigger set of jets to see if that corrects it but getting up to 145 mains just seems like it will cost me mileage.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!Comment
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u could try bumping up the main jet
by a size or 2 and make sure ur float
heights arent adjusted on the leaner side
of stock.pete
new owner of
08 gen2 hayabusa
former owner
1981 xs1100 RH (aus) (5N5)
zrx carbs
18mm float height
145 main jets
38 pilots
slide needle shimmed .5mm washer
fitted with v/stax and uni pod filters
[url]http://www.youtube.com/watch?v=3pA8dwxmAVA&feature=mfu_in_order&list=UL[/url]Comment
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Phil, I was up like a barn door.Originally posted by MaximPhil View Postmy 2cents. Even race cars do not pull redline in top gear.
XS max horsepower is at around 7200rpm. Horsepower is what gives you speed. Less weight and no wind would help to go faster.
Were you tucked in over the tank or sitting up like a barn door
Phil
I have the stock 4-2 installed currently... I think its time to check the float height. I think we both could stand to lose a few pounds, I just wish I could unbolt mine.Originally posted by Rasputin View Post
I have been trying to snipe a set of those Accel coils, Im sure the original ignition wires are at the end of their life...Last edited by WMarshy; 07-25-2012, 07:33 AM.'79 XS11 F
Stock except K&N
'79 XS11 SF
Stock, no title.
'84 Chevy K-10 "Big Blue"
GM 350, Muncie SM465, NP208, GM 10 Bolt with 3.42gears turnin 31x10.5 Baja Claws
"What they do have is an implacable, unrelenting presence and movement that bespeaks massive power lurking behind paint and chrome. They don't wail like a screeching ninja, the don't rumble like a harley. They just growl like a spactic, stressed out badger waiting to rip your face off and eat your soul." Trainzz~RIP~Comment
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