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Kz650 choke issue
- jbird526
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25 Oct 2015 11:35 #695915
by jbird526
Kz650 choke issue was created by jbird526
The details:
81 csr 650
Cheap pods
4-1 kirker
77 or 78 carbs "non pumper"
Rebuilt this 650 and parts were missing from original carbs. Rebuilt a set of carbs from another bike. Carbs ultra sonically cleaned, rejetted, floats set and synced. When bike is warmed up it idles great and no stumbles through the power band. Unfortunately starting can be a pain. When I open the choke it seems it is entirely open or closed, there is no middle ground. It revs very high when open all the way but as soon as I start backing it down it just falls flat. The choke linkage is fine and the slides go up and down with no issue mechanically. When the bike is warm enough I can quickly close the choke but always have to run it @3-4K during warmup.
Any thoughts?
81 csr 650
Cheap pods
4-1 kirker
77 or 78 carbs "non pumper"
Rebuilt this 650 and parts were missing from original carbs. Rebuilt a set of carbs from another bike. Carbs ultra sonically cleaned, rejetted, floats set and synced. When bike is warmed up it idles great and no stumbles through the power band. Unfortunately starting can be a pain. When I open the choke it seems it is entirely open or closed, there is no middle ground. It revs very high when open all the way but as soon as I start backing it down it just falls flat. The choke linkage is fine and the slides go up and down with no issue mechanically. When the bike is warm enough I can quickly close the choke but always have to run it @3-4K during warmup.
Any thoughts?
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- pete greek1
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25 Oct 2015 11:55 #695917
by pete greek1
1980 LTD 1000..,1976 LTD 900, have the 1000&900 now. the rest are previous= 1978 KZ 650 B.., 1980 Yamaha XT 500..,1978 Yamaha DT 400.., 1977 Yamaha yz 80..,Honda trail ct 70.., Honda QA 50...5-1/2 hp brigs & straton CAT chopper mini bike...3-1/2 hp mini bike (WHEN GAS WAS ABOUT 45 CENTS A GALLON)!!!!
Replied by pete greek1 on topic Kz650 choke issue
Spray some carb cleaner around your carb boots, after bike is at normal idle & see if it changes the rev's up or down, it could be a vacuum leak
wear goggles & don't smoke
Pete
wear goggles & don't smoke
Pete
1980 LTD 1000..,1976 LTD 900, have the 1000&900 now. the rest are previous= 1978 KZ 650 B.., 1980 Yamaha XT 500..,1978 Yamaha DT 400.., 1977 Yamaha yz 80..,Honda trail ct 70.., Honda QA 50...5-1/2 hp brigs & straton CAT chopper mini bike...3-1/2 hp mini bike (WHEN GAS WAS ABOUT 45 CENTS A GALLON)!!!!
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- jdvorchak
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26 Oct 2015 14:09 #696057
by jdvorchak
Don't fix it until it's broken.
John
83 KZ550M1
83 KZ1100LTD
Also own:
2010 Harley Ultra Classic Limited, 2008 Harley low rider 71 CB350/sidecar
Replied by jdvorchak on topic Kz650 choke issue
My 83 KZ550 acts the same way. Full choke or none at all. Have to let it warm up for a full minute before I can push the choke off and once warm it has great throttle response. I've checked for vacuum leaks and have OEM filter and air box. I'm curious what you find out. I'm continuing to work on it though.
I don't know if it's relevant or not but I read a review of the 83 550, done in 1983, and the reviewer said the only complaint he had was that he couldn't find a choke position that let it run smooth when cold. But I've also heard of guys with similar bikes who had no problems or at least didn't mention if they did.
I don't know if it's relevant or not but I read a review of the 83 550, done in 1983, and the reviewer said the only complaint he had was that he couldn't find a choke position that let it run smooth when cold. But I've also heard of guys with similar bikes who had no problems or at least didn't mention if they did.
Don't fix it until it's broken.
John
83 KZ550M1
83 KZ1100LTD
Also own:
2010 Harley Ultra Classic Limited, 2008 Harley low rider 71 CB350/sidecar
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- Tyrell Corp
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- "You were made as well as we could make you"
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26 Oct 2015 14:23 #696059
by Tyrell Corp
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces
Replied by Tyrell Corp on topic Kz650 choke issue
Yes, all or nothing, one of those quirks of the kz/GPz lineage. The CV carbs are nearly as bad for that too.
I never thrash them when cold so expecting it to be grumpy for the first mile on a cold start is no deal breaker for me.
I never thrash them when cold so expecting it to be grumpy for the first mile on a cold start is no deal breaker for me.
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces
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- jdvorchak
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26 Oct 2015 15:06 #696062
by jdvorchak
Don't fix it until it's broken.
John
83 KZ550M1
83 KZ1100LTD
Also own:
2010 Harley Ultra Classic Limited, 2008 Harley low rider 71 CB350/sidecar
Replied by jdvorchak on topic Kz650 choke issue
The carbs on my 83 KZ550M are CV ... so yeah ..they are a PIA from my point of view.
Don't fix it until it's broken.
John
83 KZ550M1
83 KZ1100LTD
Also own:
2010 Harley Ultra Classic Limited, 2008 Harley low rider 71 CB350/sidecar
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- jbird526
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03 Nov 2015 08:45 #697026
by jbird526
Replied by jbird526 on topic Kz650 choke issue
Thanks to everyone for the info, ideas. I have sprayed for vacuum leaks without success. Will update if I figure out the issue or if it's something to just live with.
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