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popping and wheezing like an old man with a bad hip
- pburnhamb
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08 Jun 2008 12:46 #218738
by pburnhamb
1978 kz650b (810, 750 head)
1976 kz900
1977 xs650
popping and wheezing like an old man with a bad hip was created by pburnhamb
OK, shes alive! it idles fine, but when i get on the gas a bit it wheezes and pops. it will rev up but it pops and wheezes while it does it. I cleaned the carbs pretty well before putting them on. she has 4 into 1 and aftermarket filters. any ideas? i can check the jets again, but not sure what it should have with this exhaust and filters. the 2 hoses (from carbs) that originally go to the air box are just hanging i dont cap them do i? thank you for all the help
1978 kz650b (810, 750 head)
1976 kz900
1977 xs650
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- PFC FNG
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- I've got the sickness!!!
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08 Jun 2008 15:24 #218767
by PFC FNG
I know it would not be any fun if it was easy, but does it have to be this much fun?
84 ZX750 GPZ (Waiting for paint)
Eastpoint, Mi
Replied by PFC FNG on topic popping and wheezing like an old man with a bad hip
I would guess air leak somewhere causing the carbs to get too much air. I was having popping issues with my bike at idle. That is what I would look for. The carb boots maybe? Uncovered vacumn ports?
I know it would not be any fun if it was easy, but does it have to be this much fun?
84 ZX750 GPZ (Waiting for paint)
Eastpoint, Mi
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- bountyhunter
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08 Jun 2008 18:29 - 08 Jun 2008 18:32 #218818
by bountyhunter
1979 KZ-750 Twin
Replied by bountyhunter on topic popping and wheezing like an old man with a bad hip
I think the lack of replies comes from not listing what kind of a bike it is.
IF it does idle fine, I tend to not think there's a vacuum leak since that will usually make it idle very poorly.
As to your question about pods and headers: I don't know what kind of bike, but typically you need to go about two sizes richer on the jets for that.
I'd check:
valve clearance
timing
fuel level in bowls
compression
spark plugs
for baseline info
IF it does idle fine, I tend to not think there's a vacuum leak since that will usually make it idle very poorly.
As to your question about pods and headers: I don't know what kind of bike, but typically you need to go about two sizes richer on the jets for that.
I'd check:
valve clearance
timing
fuel level in bowls
compression
spark plugs
for baseline info
1979 KZ-750 Twin
Last edit: 08 Jun 2008 18:32 by bountyhunter.
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- pburnhamb
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09 Jun 2008 17:08 #219019
by pburnhamb
1978 kz650b (810, 750 head)
1976 kz900
1977 xs650
Replied by pburnhamb on topic popping and wheezing like an old man with a bad hip
yeah sorry, a little excited that she is alive. its a 78 kz650b 4 into one V&H pipes w/pod type filters. set the points today and runs quite a bit better , just still wheezing/ hesitates when the throttle is applied a bit. any idea what jets should be in her. im going to try to find my timing light and set the timing
1978 kz650b (810, 750 head)
1976 kz900
1977 xs650
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- Patton
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09 Jun 2008 18:25 #219032
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic popping and wheezing like an old man with a bad hip
pburnhamb wrote:
The carbs might ultimately need attention, but would address them only after attending to the other items previously noted by bountyhunter, namely:
valve clearance
timing
fuel level in bowls
compression
spark plugs
timing also includes assuring correct operation of the advancer.
Remember -- even perfect carbs cannot compensate for weaknesses in the other components. That's why it's usually a waste of time (or even counter-productive) to fiddle around with the carbs before the other matters have been attended.
Good Luck!
...still wheezing/ hesitates when the throttle is applied a bit. any idea what jets should be in her. im going to try to find my timing light and set the timing
The carbs might ultimately need attention, but would address them only after attending to the other items previously noted by bountyhunter, namely:
valve clearance
timing
fuel level in bowls
compression
spark plugs
timing also includes assuring correct operation of the advancer.
Remember -- even perfect carbs cannot compensate for weaknesses in the other components. That's why it's usually a waste of time (or even counter-productive) to fiddle around with the carbs before the other matters have been attended.
Good Luck!
1973 Z1
KZ900 LTD
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- Patton
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09 Jun 2008 18:35 - 09 Jun 2008 18:39 #219036
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic popping and wheezing like an old man with a bad hip
Does this diagram depict the carbs in question?
Is the pilot screw side-located or bottom-located?
Good Luck!
[click on image for larger view]
Is the pilot screw side-located or bottom-located?
Good Luck!
[click on image for larger view]
1973 Z1
KZ900 LTD
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Last edit: 09 Jun 2008 18:39 by Patton.
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