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Whont run without airbox ??
- wannaby
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02 Jul 2010 19:04 #379786
by wannaby
Whont run without airbox ?? was created by wannaby
So got it running today 82 kz1000 with haywired fuel supply ran but had to use throttle to keep it running..so is it true it whont run worth crap unless fully hooked back up to air box.cant really get it to idle down past about 2000 or it stalls...Ideas.
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- TeK9iNe
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02 Jul 2010 20:30 #379803
by TeK9iNe
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
Replied by TeK9iNe on topic Whont run without airbox ??
The carburetor has several fuel "circuits" that in stock setup, rely on the pressure and flow control of the stock air filter and box.
The air box itself and the snorkel piece that attaches to it are specifically (acoustically) designed to aid in smooth performance in the lower rpms. Much like how a speaker box is engineered.
You ALWAYS need proper filtration, and everything must be completely air tight, from intake to exhaust tip.
GL!
The air box itself and the snorkel piece that attaches to it are specifically (acoustically) designed to aid in smooth performance in the lower rpms. Much like how a speaker box is engineered.
You ALWAYS need proper filtration, and everything must be completely air tight, from intake to exhaust tip.
GL!
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
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- wannaby
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02 Jul 2010 20:47 #379807
by wannaby
Replied by wannaby on topic Whont run without airbox ??
So if you run pods would you need to re tune and what would be the procedure.
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- polkat
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02 Jul 2010 20:58 - 02 Jul 2010 21:00 #379811
by polkat
Replied by polkat on topic Whont run without airbox ??
My KZ750-4 ran fine when I switched to pods after I rejetted the carbs. Pods cause the carbs to run lean and you have to jet up (up 2 sizes is a good starting point) to get things right again. haven't had any problems since then, but you do hear both good and horror stories about it.
Last edit: 02 Jul 2010 21:00 by polkat.
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- mtkawboy
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06 Jul 2010 16:11 #380644
by mtkawboy
78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
Replied by mtkawboy on topic Whont run without airbox ??
They will barely run with stock jetting & no air box
78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
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- wannaby
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07 Jul 2010 23:35 #380968
by wannaby
Replied by wannaby on topic Whont run without airbox ??
thx could be my problem working on getting the airbox back in just have to soften u the carb boots.
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09 Jul 2010 09:00 #381258
by mtkawboy
78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
Replied by mtkawboy on topic Whont run without airbox ??
Take the bolts out of the battery box, it will give you a little extra badly needed room. You might try a hair dryer on them
78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
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- Polar_Bus
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09 Jul 2010 09:26 - 09 Jul 2010 09:30 #381261
by Polar_Bus
Bikes:
'84 GPz1100
'06 HD Fatboy
Replied by Polar_Bus on topic Whont run without airbox ??
stock jetted CV type carbs need to sense a vacume signal generated from a stock airbox to run correctly. Not just KZ, but most all bikes. My GS1100 behave exactly the same, no airbox, no run... airbox installed and the bike ran great.
Bikes:
'84 GPz1100
'06 HD Fatboy
Last edit: 09 Jul 2010 09:30 by Polar_Bus.
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- wannaby
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11 Jul 2010 17:27 #381767
by wannaby
Replied by wannaby on topic Whont run without airbox ??
Well poped the airbox back on and it started without having to use the eather spray.... still runs rough but at least it starts and runs So just have the temp fuel supply hooked up and all four vac lines on the carbs plugged off could this be the reason why its running rough.
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- WABBMW
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12 Jul 2010 14:10 #382037
by WABBMW
Bill Baker
Houston, Texas
1982 KZ650 CSR
2008 Yamaha FZ1
2006 Yamaha FZ1
1977 Honda Supersport 750 four (sold)
1984 Honda Nighthawk 650 (sold)
Replied by WABBMW on topic Whont run without airbox ??
My '82 KZ650 uses Mikuni BS32 carbs, which are the CV type. The bike got great gas mileage and ran smoothly, but was not obtaining its potential power.
With stock jets and stock jet needle settings, I tried taking off the top collar from the air box and removing the filter. The bike ran terrible !!! From about 1/8 throttle on up, it had little power, and stumbled badly.
Next, I increased the Main jets by 2 sizes, and raised the jet needles by 4 mm. Again, I removed the top collar from the air box. It ran slightly better than before, but still very poor.
Then I installed an air filter (used for 10,000 miles), and the stock top air box collar. The motorcycle would pull your arms off - really ran great - smooth and powerful. Then I put a new air filter in, and the bike did not run quite as well. Polar_Bus was right about the CV carbs being dependent upon a slight vacuum or restriction from the air box to get top performance.
I just wish I understood why this seems to be the case.
With stock jets and stock jet needle settings, I tried taking off the top collar from the air box and removing the filter. The bike ran terrible !!! From about 1/8 throttle on up, it had little power, and stumbled badly.
Next, I increased the Main jets by 2 sizes, and raised the jet needles by 4 mm. Again, I removed the top collar from the air box. It ran slightly better than before, but still very poor.
Then I installed an air filter (used for 10,000 miles), and the stock top air box collar. The motorcycle would pull your arms off - really ran great - smooth and powerful. Then I put a new air filter in, and the bike did not run quite as well. Polar_Bus was right about the CV carbs being dependent upon a slight vacuum or restriction from the air box to get top performance.
I just wish I understood why this seems to be the case.
Bill Baker
Houston, Texas
1982 KZ650 CSR
2008 Yamaha FZ1
2006 Yamaha FZ1
1977 Honda Supersport 750 four (sold)
1984 Honda Nighthawk 650 (sold)
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- wannaby
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13 Jul 2010 11:22 #382281
by wannaby
Replied by wannaby on topic Whont run without airbox ??
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- 650ed
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13 Jul 2010 13:25 #382314
by 650ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Replied by 650ed on topic Whont run without airbox ??
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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