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Got Any Ideas?
- hardrockminer
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06 Jun 2024 03:46 #900333
by hardrockminer
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
Replied by hardrockminer on topic Got Any Ideas?
It sounds like you're getting plenty of fuel through the choke circuit but not enough through the pilot circuit to keep the bike running.
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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- Buffalo515
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06 Jun 2024 09:16 #900362
by Buffalo515
Travis
Maryland
1981 GPZ 550 -gone
1984 GPZ 550
1985 GPZ 550
Replied by Buffalo515 on topic Got Any Ideas?
Yea and I’ve blown 90 psi through every port, especially the pilot circuit and felt air coming out of the other end so it would appear they are clear and the jets and have nice clear passages. I even sized the jets up to 34 from 32.
Travis
Maryland
1981 GPZ 550 -gone
1984 GPZ 550
1985 GPZ 550
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- hardrockminer
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06 Jun 2024 14:56 #900381
by hardrockminer
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
Replied by hardrockminer on topic Got Any Ideas?
Everything you said you've done suggests the bike should start just fine. I'm wondering if that 7 mm spec on the float valves is the issue? You might want to raise them. A Mikuni spec is usually around 3 to 4 mm.
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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- Buffalo515
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06 Jun 2024 16:40 - 06 Jun 2024 17:18 #900386
by Buffalo515
Travis
Maryland
1981 GPZ 550 -gone
1984 GPZ 550
1985 GPZ 550
Replied by Buffalo515 on topic Got Any Ideas?
Picture of plugs shown below.
Checked each cylinder and it has enough compression to throw my finger off.
That 7mm is out of the clymer manual. And 7mm below the mating surface is also listed for the tk26 on loudhvx’s site.
Checked each cylinder and it has enough compression to throw my finger off.
That 7mm is out of the clymer manual. And 7mm below the mating surface is also listed for the tk26 on loudhvx’s site.
Travis
Maryland
1981 GPZ 550 -gone
1984 GPZ 550
1985 GPZ 550
Last edit: 06 Jun 2024 17:18 by Buffalo515.
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- TexasKZ
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06 Jun 2024 19:41 #900393
by TexasKZ
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
Replied by TexasKZ on topic Got Any Ideas?
I thought seven seemed too much, but hat is what the fsm calls for.Everything you said you've done suggests the bike should start just fine. I'm wondering if that 7 mm spec on the float valves is the issue? You might want to raise them. A Mikuni spec is usually around 3 to 4 mm.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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- hardrockminer
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07 Jun 2024 04:05 #900410
by hardrockminer
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
Replied by hardrockminer on topic Got Any Ideas?
OK...7 it is then.
So the engine runs on the choke circuit which means you have fuel and ignition. But it doesn't run on the primary circuit, which means fuel is not getting from the bowls into the air intake. This can occur when jets are clogged and we have ruled that out. It can also occur when the pressure differential between the bowls and the intake is too small because fuel will not be drawn up the jets. But you said your bowls are properly vented.
What about the air screws on the primary circuit? They control air and fuel mixture at low rpm's.
So the engine runs on the choke circuit which means you have fuel and ignition. But it doesn't run on the primary circuit, which means fuel is not getting from the bowls into the air intake. This can occur when jets are clogged and we have ruled that out. It can also occur when the pressure differential between the bowls and the intake is too small because fuel will not be drawn up the jets. But you said your bowls are properly vented.
What about the air screws on the primary circuit? They control air and fuel mixture at low rpm's.
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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- Buffalo515
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07 Jun 2024 18:35 - 07 Jun 2024 18:36 #900441
by Buffalo515
Travis
Maryland
1981 GPZ 550 -gone
1984 GPZ 550
1985 GPZ 550
Replied by Buffalo515 on topic Got Any Ideas?
Rechecked fuel service levels. All in spec and actually lean more towards 6mm.
Pilot air/fuel mixture screws are all new. All turned out 1.5 turns.
My float bowl vents might be a problem. They don’t seat very tight as I replaced the old cracked o rings with some nitrile ones I had of similar size. The float bowls seem to take awhile to fill up and fuel trickles into the carb inlet from the auxiliary tanks. I have a clear tube hooked up between the two. Could this be a problem?
pictured is the carb bowl vent I’m referring to.
Pilot air/fuel mixture screws are all new. All turned out 1.5 turns.
My float bowl vents might be a problem. They don’t seat very tight as I replaced the old cracked o rings with some nitrile ones I had of similar size. The float bowls seem to take awhile to fill up and fuel trickles into the carb inlet from the auxiliary tanks. I have a clear tube hooked up between the two. Could this be a problem?
pictured is the carb bowl vent I’m referring to.
Travis
Maryland
1981 GPZ 550 -gone
1984 GPZ 550
1985 GPZ 550
Last edit: 07 Jun 2024 18:36 by Buffalo515.
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- hardrockminer
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07 Jun 2024 19:31 #900444
by hardrockminer
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
Replied by hardrockminer on topic Got Any Ideas?
The engine is getting fuel on the choke circuit so I would assume flow to the bowls is OK. Have you tried taking the bowls off and checking your fuel flow when the float is wide open and then close it manually (with your hand) to see if it works as it should? Also, and I'm really reaching for this one...is it possible your floats remain stuck closed when the bowls are installed? I've had a float that remained in closed position because it was touching the side of the bowl, but never had four of them sticking at the same time.
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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- sf4t7
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07 Jun 2024 20:21 #900446
by sf4t7
Scotty
1974 Z1A
1015
welded Z1 crank
Andrews 1X Cams
Delkevic 4 into 1
Replied by sf4t7 on topic Got Any Ideas?
You stated you have a clear tube connecting the bowl vents together. Does this mean you've linked the two pairs of bowl vents? Shouldn't the bowl vents (in pairs) be open to the atmosphere to vent properly? (Maybe I'm misunderstanding your description)
Scotty
1974 Z1A
1015
welded Z1 crank
Andrews 1X Cams
Delkevic 4 into 1
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- Buffalo515
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07 Jun 2024 20:50 #900447
by Buffalo515
Travis
Maryland
1981 GPZ 550 -gone
1984 GPZ 550
1985 GPZ 550
Replied by Buffalo515 on topic Got Any Ideas?
No sorry, the clear tube I’m referring to connects an auxiliary tank with the fuel inlet to the carbs. The bowls are vented in pairs connected by a T joints as shown in the previous picture.
I will check the floats.
This bike really has me stumped. I’ve never went through carbs so meticulously. Never had one give me this much of a fit just to idle on its own.
It runs intermittently on choke, but only for at most 30 seconds, then dies. I have tried adjusting fast idle and the air/fuel mixture screw in several configurations, but no real improvement.
I will check the floats.
This bike really has me stumped. I’ve never went through carbs so meticulously. Never had one give me this much of a fit just to idle on its own.
It runs intermittently on choke, but only for at most 30 seconds, then dies. I have tried adjusting fast idle and the air/fuel mixture screw in several configurations, but no real improvement.
Travis
Maryland
1981 GPZ 550 -gone
1984 GPZ 550
1985 GPZ 550
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- Rolf1976_KZ900
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08 Jun 2024 00:37 - 08 Jun 2024 01:23 #900450
by Rolf1976_KZ900
Replied by Rolf1976_KZ900 on topic Got Any Ideas?
Have you done the test to se if it gets to much fuel? i mean to take off the sparkplug caps and turn the engine on starter for a while then take the plugs out to se if they are wet. Also look at the top of pistons if they are wet.
If wet it gets fuel ,but mayby too much.Fuel should not drible into the intake when you have a external tank fitted that may be the reason for it getting too much fuel. To fix that you will have to lower the fuel level a little or it can be that the needlevalveseat gasket/o ring are leaking.
If wet it gets fuel ,but mayby too much.Fuel should not drible into the intake when you have a external tank fitted that may be the reason for it getting too much fuel. To fix that you will have to lower the fuel level a little or it can be that the needlevalveseat gasket/o ring are leaking.
Last edit: 08 Jun 2024 01:23 by Rolf1976_KZ900.
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- TexasKZ
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08 Jun 2024 09:17 #900451
by TexasKZ
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
Replied by TexasKZ on topic Got Any Ideas?
Bowls are slow to fill, but continue to take on fuel after filled? Seems like that could be float valve problems. Are they oem or Keyster? Many aftermarket ones are junk.
If used, did the needles get mixed up? The needles and seats wear together and need to stay together.
If used, did the needles get mixed up? The needles and seats wear together and need to stay together.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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