'80 SG... First Start...
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Woo hoo! Some success finally!!
Went through and changed out the rebuild kit needles for a set of good stockers, and swapped on a set of bottom-drain bowls. I also re-set the float levels to 24.5mm instead of 23 to drop the fuel level. That may be a bit lean, but I'll do the sync and idle adjustment first before I worry too much about that. I did have trouble with high idle, but finally figured out that the throttle sleeve wasn't letting the carb butterflies close quite all the way. Pulled the sleeve and altered it until I had slack in the cable, much better. I now have a stable idle.
It appears the RLU has gone TU, as the 'headlight' indicator came on after the third start, and stays on no matter if it's high or low... grrrr...
But it's progress!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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good stuff,
was that the slide needles or the needle from the
needle and seat?
to check for corect float height while riding
have the bike in 5th gear, crack open to wot from
2000rpm, there should be no lag or bogging down and
should accept throttle to redline if floats are set correctly.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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Pete, I replaced the slide needles. The rebuild kits came with some adjustable brass needles, but they had a different taper and a rather sloppy fit in the slides. I had to dig through all my carb stuff to come up with four good stockers...
And there's definitely 'stuff' in that eBay exhaust, as the mufflers still had smoke coming out them five minutes after I shut the bike off!Last edited by crazy steve; 07-05-2011, 10:45 PM.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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Glad you got the carbs almost sorted out. Just reset that float height back to stock and you should be in fine shape.
Don't overlook the easy solution on the RLU and try a new headlight.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 XS750Comment
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Glad you got the girl running!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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Ah, the wrong needles were the problem. I've seen it happen a couple times, wouldn't even think that would affect low speed. Good, you got it running better.2H7 (79) owned since '89
3H3 owned since '06
"If it ain't broke, modify it"
☮Comment
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yep, didnt think the needles would come into effect at idle,
good to know in future tho.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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As I mentioned or eluded to earlier in the thread, I made a mistake in assembly the first time I dug into my carbs. Out of curiosity I took one of the slides apart just to see what was in there. When I put it back together I put the spring in first, then the needle. I only took one apart and so it was only one back in wrong. That one cylinder ran rich as can be no matter what I did with the mix screw in low RPM and idle. That cylinder would foul out when sitting at a light, or cruising around at low RPM, but as soon as I got above 3k or so it would kick back in. Run the bike at low RPM and the plug came out black as the ace of spades. Run it above 3k and look again, plug was nice and tan/clean. Took me a loooonng time to finally figure out what was wrong. Got the needle and spring in the right order and that bike ran great ever since.
Essentially, it is the same thing as having your slide raised up just a little, so you actually bring the main jets into play at idle and low RPM.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 XS750Comment
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As I mentioned or eluded to earlier in the thread, I made a mistake in assembly the first time I dug into my carbs. Out of curiosity I took one of the slides apart just to see what was in there. When I put it back together I put the spring in first, then the needle. I only took one apart and so it was only one back in wrong. That one cylinder ran rich as can be no matter what I did with the mix screw in low RPM and idle. That cylinder would foul out when sitting at a light, or cruising around at low RPM, but as soon as I got above 3k or so it would kick back in. Run the bike at low RPM and the plug came out black as the ace of spades. Run it above 3k and look again, plug was nice and tan/clean. Took me a loooonng time to finally figure out what was wrong. Got the needle and spring in the right order and that bike ran great ever since.
Essentially, it is the same thing as having your slide raised up just a little, so you actually bring the main jets into play at idle and low RPM.
both you and phil made the correct call there,
i was always under the belief that the needle along with the main jet
wouldnt make any difference at idle, u learn something everyday hey.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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Well, I missed a few days (one due to a funeral, and the second to let my back recover from those unpadded church pews; those just kill my back...), so I got out and worked on the sync/adjustment today.
First, let me say that my 'Murrin' sync tool works great. Took less than ten minutes to get the initial sync before I had to shut the motor off. Why did I 'have' to shut it off, you ask? I painted the barrels/heads with brushed-on oil-based paint, and there's a cure process when you do this. A few more heat cycles, and it'll be ready to test ride.
The carbs adjusted no problem, so it probably was the slide needles causing the problem (well, that and the throttle being too far open due to the throttle sleeve). Smooth idle, responds to throttle good, starts easily. All good...
I'm waiting until tomorrow to do a test ride, as nobody is around on a weekday to retrieve me if there's any 'glitch' in the ride...I'm also waiting until after the test ride to see if I need to change the float levels, as I think they're set pretty close to where they were before.
The issue with the RLU was a loose connection at the handlebar control plug under the tank; I tightened the female side and the problem is gone.
I also figured out the 'trick' to getting the stock airbox on with minimum fuss. Some of you may already know this, but in case you don't, here it is: Get the stacks started on the carbs on one side or the other. Don't worry about the airbox being cocked. Once you have two on one side on the carb throats as far as you can, install the lower mounting screw on that side. Now you can go to the other side and 'lever' the airbox towards the carbs to get the other two on. The screw prevents the first two from popping off...Works great....
Last edited by crazy steve; 07-08-2011, 04:45 PM.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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