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air leaks.
- sverre
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23 Aug 2015 07:05 - 23 Aug 2015 07:09 #686809
by sverre
air leaks. was created by sverre
So what ive done so far is: new carb holder/mounts, new air box rubbers, new z1 type hoods for the vacuum ports on carbs, cleaned carbs, new clamps for the carb holders, tightened everything up good. but still seems like there are a slight leak somewhere.. idle is all over the place, either 1500, 2500, 2000.. slow to come down to idle, and hangs.. and dies sometimes. might hang up at 2500 then come down to 1500, maybe 1000 and the die..different idle every time i come to a stoplight. could this just be carb sync or do i still have a leak somewhere? the hose going to the tap seems tight enough? could this be it?
everybod likes pictures, so i added a random one.
everybod likes pictures, so i added a random one.
Attachment IMG_0413.jpg not found
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Last edit: 23 Aug 2015 07:09 by sverre.
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- SWest
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- 10 22 2014
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23 Aug 2015 07:08 #686810
by SWest
Replied by SWest on topic air leaks.
When was the last time the valves were adjusted? Do routine maintenance first before going to the carbs.
Steve
Steve
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- Patton
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23 Aug 2015 07:37 #686819
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic air leaks.
With engine running, could try spraying WD40 over possible air leaks sources and watching for exhaust smoke due to ingested WD40 (and perhaps also a change in rpm).
Varying idle rpm might also be due to a mechanical issue with the throttle cable, anywhere from the handlebar twist mechanism to the connection at the carb bell crank, or a slack adjustment might be needed, or maybe the interion cable is frayed, or throttle cable needs lubing, etc.
Good Fortune!
Varying idle rpm might also be due to a mechanical issue with the throttle cable, anywhere from the handlebar twist mechanism to the connection at the carb bell crank, or a slack adjustment might be needed, or maybe the interion cable is frayed, or throttle cable needs lubing, etc.
Good Fortune!
1973 Z1
KZ900 LTD
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- SWest
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23 Aug 2015 07:41 #686821
by SWest
Replied by SWest on topic air leaks.
Carb slides could be sticking. Had it been sitting?
Steve
Steve
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- jackleberry
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23 Aug 2015 10:36 #686833
by jackleberry
1997 KZ1000P (P16)
2001 KZ1000P (P20)
Replied by jackleberry on topic air leaks.
Are you sure it's an air leak? Have you set the idle mixtures? Did you use any sealant when installing the new carb holders? If so, did you let it cure for the amount of time specified in the instructions before starting the motor? Did you torque the bolts on them to spec?
As swest hinted at, too tight intake valves can cause lean-condition-like symptoms when the bike warms up.
As swest hinted at, too tight intake valves can cause lean-condition-like symptoms when the bike warms up.
1997 KZ1000P (P16)
2001 KZ1000P (P20)
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- sverre
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23 Aug 2015 13:57 - 23 Aug 2015 14:01 #686854
by sverre
Replied by sverre on topic air leaks.
thanks for the tips!
Havent done a valve adjustment, was thinking that i should sort the carbs first, since that was something i could do on my own right now and didnt have to use a shop. The bike have been sitting for aprox 7 years so i guess i have to try lubing the gas wire and checking if the slides are sticking. i did not use sealant on the carb holders just put them on dry as i was told to do.. the old ones did not have a gasket or sealant either. torqued the bolts to spec. pilot screws set at 2 turns out as specified in the FSM
better go get my WD40
Havent done a valve adjustment, was thinking that i should sort the carbs first, since that was something i could do on my own right now and didnt have to use a shop. The bike have been sitting for aprox 7 years so i guess i have to try lubing the gas wire and checking if the slides are sticking. i did not use sealant on the carb holders just put them on dry as i was told to do.. the old ones did not have a gasket or sealant either. torqued the bolts to spec. pilot screws set at 2 turns out as specified in the FSM
better go get my WD40
Last edit: 23 Aug 2015 14:01 by sverre.
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- missionkz
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23 Aug 2015 14:19 #686863
by missionkz
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado
Replied by missionkz on topic air leaks.
If you happen to be one of those unlucky blokes who has a head with intake valves that are slightly leaking, because the valves not been adjusted properly, it will spit exhaust or mixture compression from cylinders right back in the carburetors and Jack up anything you're trying to do with the carburetors....
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado
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- SWest
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23 Aug 2015 14:38 #686872
by SWest
Replied by SWest on topic air leaks.
It is folly to go straight to the carbs when normal maintenance hasn't been done. It is common for new owners to avoid doing them due to the time, work and money involved. Once done, they can last as long as 3000 miles. You might be able to get it to run but it will never run right and possibly quit running until a major valve job is done. Cheap insurance.
Steve
Steve
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