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Syncing issue or much more?
- magruder13
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I picked up a 1982 KZ 440 LTD D Belt and am having some issues and I'm not sure what is causing them. I would have used the search but I don't know what my problem is exactly. I will list my symptoms and what I have done, and how it turned out and maybe someone can tell me what to do. I appreciate any and all help I can get!
Symptoms:
Bike starts fine on full coke and idles high.(tach is broke, that's another issue, but I can just tell when comparing it to the feel of my kz550) The idle screw is backed all the way off so it's not just adjusted high. If I let the bike warm up it idles higher, often too high for my comfort. I can drive it around, giving no throttle when it's choked.
For example, today I fired it up, let it sit for maybe a minute, then drove it down the street, maybe went 300 yards and it started idling higher, so I unchoke it, and it almost kills it. Then when half choaked (so it wont die or idle too high) if I try to give throttle the bike moans and boggs down and dies. Also throttle is VERY slow to respond, off by up to 2-3 seconds. If I drive when the idle is on partially (to keep it from dying) I get a very jerky ride. It's like little bursts of energy.
I have tried cleaning the carbs multiple times. The first time, they were a little dirty and one float needle had a huge piece of dirt stuck to it, cleaned it all out and it ran good for maybe 10 minutes (could have been just before it warmed up and I was so excited / exhausted my brain just wanted it to work) I went through and did a more detailed cleaning and I found no new material, blew all the lines out, cleaned it spotless! Still no better. I have done a lot of research on this, carbs are VERY new to me, and I think it could need a syncing, but I did just a bench syncing, (following video below) the valves look to exactly match, not sure how precise it needs to be but I don't own the vacuum gauges needed to test that.
I can have the carbs synced at my local shop but they want around $160 for it, and I don't want to throw that kind of money at this bike unless I am certain it will fix it.
Extra Info:
I am using these air filters and stock exhaust.
Bench Syncing
1982 Honda XL125S
1972 Yamaha TX750 (CB750 engine)
1976 Kawasaki KZ400
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- donthaveakawman
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the choke primes the fuel system when it has been sitting and "warms up the engine"
you may run into a leaky vacuum petcock-i.e. the vacuum nipple will leak into the intake and ruin that cylinder. .
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- magruder13
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I also installed new spark plugs so that wont be the issue.
As for the petcock, I just rebuilt it, and it's not leaking at all but I can't figure out where to connect the vacuum hose to, I think it goes somewhere on the carbs right? Right now I'm just running it in prime.
1982 Honda XL125S
1972 Yamaha TX750 (CB750 engine)
1976 Kawasaki KZ400
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- donthaveakawman
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- magruder13
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Any other ideas?
1982 Honda XL125S
1972 Yamaha TX750 (CB750 engine)
1976 Kawasaki KZ400
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- donthaveakawman
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- jonarmstrong
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82 Kz1000 gpz1100 cams dyna ignition kerker k&n
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- jonarmstrong
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82 Kz1000 gpz1100 cams dyna ignition kerker k&n
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- donthaveakawman
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- magruder13
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This video only shows syncing the butterflies. Not the air circuits. If ur air screws are still capped off might try removing the caps and screws to clean those ports. Be sure to run the screws in all the way first to see how far out they were set from factory. Mine were all different settings so I set them at 1 1/2 turns out till I could put the guages on them
The air screws are the screws located on top of the carbs near the inlet to the engine, correct? If those are the ones you're talking about, I cleaned them, and they were both set at exactly 1/2 turn out. Do you recommend me turning them out about 1 whole turn more?
I could just go buy a carb sync gauge kit, it would be cheaper than paying a garage to fix them.
1982 Honda XL125S
1972 Yamaha TX750 (CB750 engine)
1976 Kawasaki KZ400
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- AtLarge
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magruder13 wrote:
I could just go buy a carb sync gauge kit, it would be cheaper than paying a garage to fix them.
And you get the benefit of using them again and again in the future whenever you want to.
1973 Honda CL70-K3
1975 Kawasaki 350 F9-C
1983 Kawasaki KZ750-K1
1994 BMW K1100RS
2008 Suzuki GSX1300-BKK8 #1120
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- donthaveakawman
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