- Posts: 76
- Thank you received: 0
Engine races on start up
- burkmanofgod
- Topic Author
- Offline
- User
- 1981 KZ750H2
Less
More
22 Mar 2009 21:00 #274417
by burkmanofgod
1981 Kawasaki 750 LTD
2006 Honda Shadow 1100 Spirit
Replied by burkmanofgod on topic Engine races on start up
1981 Kawasaki 750 LTD
2006 Honda Shadow 1100 Spirit
Attachments:
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
Less
More
- Posts: 18640
- Thank you received: 2098
22 Mar 2009 21:24 #274424
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic Engine races on start up
Looks like some type of aftermarket "cruise control" device that's likely jammed or been left in the ON position (which is supposed to help keep the throttle from automatically pulling itself closed).
Good Luck!
Good Luck!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- hugo
- Away
- Sustaining Member
- '92 Zephyr 750
Less
More
- Posts: 280
- Thank you received: 71
23 Mar 2009 05:18 - 23 Mar 2009 05:22 #274474
by hugo
Replied by hugo on topic Engine races on start up
It is an aftermarket inexpensive "so called cruise control". It is actually a throttle position holder, but is missing the top lever. Dropping the lever, it tightens the grip on the throttle, up the levver loosens it. For your purposes, just take if off getting it out of the way.
About the second throttle cable. I have '91 Zephyr 750 with Keihin CVK32(Yours would be CV32). It does have two cables, but I understand the second return cable is not needed. It is there only for safety. The carb return spring does the returning. Even if it had it before, the carb should return.
About the second throttle cable. I have '91 Zephyr 750 with Keihin CVK32(Yours would be CV32). It does have two cables, but I understand the second return cable is not needed. It is there only for safety. The carb return spring does the returning. Even if it had it before, the carb should return.
Last edit: 23 Mar 2009 05:22 by hugo.
Please Log in or Create an account to join the conversation.
- hoghaterkaw
- Offline
- User
Less
More
- Posts: 186
- Thank you received: 1
23 Mar 2009 07:09 #274483
by hoghaterkaw
Replied by hoghaterkaw on topic Engine races on start up
yup, the guys are right. remove what is left of the cruise control.
Please Log in or Create an account to join the conversation.
- JR
- Offline
- Sustaining Member
Less
More
- Posts: 2940
- Thank you received: 449
23 Mar 2009 16:45 - 24 Mar 2009 01:04 #274644
by JR
1980 kz750E1, Delkevic exhaust
Replied by JR on topic Engine races on start up
I have never seen one of those "cruise control" thingies and like the replies above I would guess it's the root cause of your racing problem and would suggest you get rid of it
I have the same CV34 carbs and they have only one cable. The big black idle adjsutment knob should be about the middle of it's range of travel.
Then check that the spring on the linkage where the cable attaches to the carbs has enough power to snap the throttle flaps closed
Then lube the cable and when you get the handlebar piece sorted out you want about a 1/4 inch of free play in the twist grip (you twist thw grip about 1/4 inch before it starts to pull the cable) and like the guys say you want it to snap closed when you release the grip.
Once you get this issue figured out you will likely need to synchronise the carbs
Just thinking about the smell of gas in your oil and wondering if this was a result of the gas overflowing experience of your earlier post.
Good luck
I have the same CV34 carbs and they have only one cable. The big black idle adjsutment knob should be about the middle of it's range of travel.
Then check that the spring on the linkage where the cable attaches to the carbs has enough power to snap the throttle flaps closed
Then lube the cable and when you get the handlebar piece sorted out you want about a 1/4 inch of free play in the twist grip (you twist thw grip about 1/4 inch before it starts to pull the cable) and like the guys say you want it to snap closed when you release the grip.
Once you get this issue figured out you will likely need to synchronise the carbs
Just thinking about the smell of gas in your oil and wondering if this was a result of the gas overflowing experience of your earlier post.
Good luck
1980 kz750E1, Delkevic exhaust
Last edit: 24 Mar 2009 01:04 by JR.
Please Log in or Create an account to join the conversation.
- burkmanofgod
- Topic Author
- Offline
- User
- 1981 KZ750H2
Less
More
- Posts: 76
- Thank you received: 0
25 Mar 2009 18:23 #275382
by burkmanofgod
1981 Kawasaki 750 LTD
2006 Honda Shadow 1100 Spirit
Replied by burkmanofgod on topic Engine races on start up
OK here is the update. I removed the leftovers from the aftermarket cruise control and that freed up the throttle so that it returns on it's own. I refitted the carbs into the boots that connect them on the engine. I thought maybe they just weren't seated well. I have ordered new ones just in case. The bike starts on a full choke and chugs for a bit till it warms up and then BOOM it races to over 5000 rpms. After I shut it down with the kill switch I opened the choke all the way and it would restart and race each time. So I know it is not the throttle sticking, and while it was warming up I was spaying carb cleaner around the boots and there wasn't any change (unless it took a few seconds to get though?)
I was reading the book about synchronisation of the carbs and it says I need a vacuum gauge. I found them at Z1 for about $60. I guess I need to order them as well.
I was also thinking about rechecking the floats to see if they are alright. I keep thinking that I might just have them out of adjustment.
So does anybody have any tips on carb adjustment and synchronizing?
I was reading the book about synchronisation of the carbs and it says I need a vacuum gauge. I found them at Z1 for about $60. I guess I need to order them as well.
I was also thinking about rechecking the floats to see if they are alright. I keep thinking that I might just have them out of adjustment.
So does anybody have any tips on carb adjustment and synchronizing?
1981 Kawasaki 750 LTD
2006 Honda Shadow 1100 Spirit
Please Log in or Create an account to join the conversation.
- MFolks
- Offline
- User
Less
More
- Posts: 6650
- Thank you received: 540
25 Mar 2009 21:26 #275456
by MFolks
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)
Replied by MFolks on topic Engine races on start up
Go to
www.wgcarbs.com
He has a similar forum and if he has time can answer your carb question.
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)
Please Log in or Create an account to join the conversation.
- burkmanofgod
- Topic Author
- Offline
- User
- 1981 KZ750H2
Less
More
- Posts: 76
- Thank you received: 0
25 Mar 2009 22:15 #275460
by burkmanofgod
1981 Kawasaki 750 LTD
2006 Honda Shadow 1100 Spirit
Replied by burkmanofgod on topic Engine races on start up
Thanks I will post there and hope for the best.
1981 Kawasaki 750 LTD
2006 Honda Shadow 1100 Spirit
Please Log in or Create an account to join the conversation.
- JR
- Offline
- Sustaining Member
Less
More
- Posts: 2940
- Thank you received: 449
26 Mar 2009 09:13 - 26 Mar 2009 09:15 #275514
by JR
1980 kz750E1, Delkevic exhaust
Replied by JR on topic Engine races on start up
With the carbs off the bike and the idle knob about where it should be are the throttle flaps or - butterflies or whatever one calls them - on the engine side of the carbs closed shut?
On the air filter side of the carbs with the choke lever in the fully off position are the choke flaps fully open ? ie not restricting the air flow ?
I'm just thinking along the lines of "never underestimate what mayhem a previous owner may have committed"
On the air filter side of the carbs with the choke lever in the fully off position are the choke flaps fully open ? ie not restricting the air flow ?
I'm just thinking along the lines of "never underestimate what mayhem a previous owner may have committed"
1980 kz750E1, Delkevic exhaust
Last edit: 26 Mar 2009 09:15 by JR.
Please Log in or Create an account to join the conversation.
- burkmanofgod
- Topic Author
- Offline
- User
- 1981 KZ750H2
Less
More
- Posts: 76
- Thank you received: 0
26 Mar 2009 11:17 #275537
by burkmanofgod
1981 Kawasaki 750 LTD
2006 Honda Shadow 1100 Spirit
Replied by burkmanofgod on topic Engine races on start up
Thanks for all the ideas. I am going to pull them off today and check everything out again. Since I have new boots on the way I figure they need to come off anyways.
1981 Kawasaki 750 LTD
2006 Honda Shadow 1100 Spirit
Please Log in or Create an account to join the conversation.
- cafekz750
- Offline
- User
Less
More
- Posts: 333
- Thank you received: 0
26 Mar 2009 11:37 - 26 Mar 2009 11:39 #275540
by cafekz750
1981 KZ750H2 - V&H 4-1 pipe, pods, jetted, clubmans, homebrew rearsets, 18" rear wheel and more.
Parting out a 1982 KZ750H3 to fund future projects
2 other non-Kawasaki motorcycles
Replied by cafekz750 on topic Engine races on start up
I have the same bike and had the exact same problem with mine. If I backed the idle screw all the way out, the bike would not stay running without the throttle being opened. If I tried to set the idle, it would race to 5000rpms and just hang there. The issue with my bike was the sealing of the intake boots. They were not cracked; the boots happened to be loose as in not screwed in tightly to the engine. I was able to reuse boots just by tightening the screws (with thread locker) and it fixed the idle trouble. I was able to diagnose the problem by spraying starter fluid on the carbs boots while the engine was running. When I did that, two the cylinders cause the idle to increase.
I hope you find the problem.
I hope you find the problem.
1981 KZ750H2 - V&H 4-1 pipe, pods, jetted, clubmans, homebrew rearsets, 18" rear wheel and more.
Parting out a 1982 KZ750H3 to fund future projects
2 other non-Kawasaki motorcycles
Last edit: 26 Mar 2009 11:39 by cafekz750.
Please Log in or Create an account to join the conversation.
- burkmanofgod
- Topic Author
- Offline
- User
- 1981 KZ750H2
Less
More
- Posts: 76
- Thank you received: 0
26 Mar 2009 18:48 #275660
by burkmanofgod
1981 Kawasaki 750 LTD
2006 Honda Shadow 1100 Spirit
Replied by burkmanofgod on topic Engine races on start up
Thanks for the tip I ordered new boots and hope it is something this simple.
1981 Kawasaki 750 LTD
2006 Honda Shadow 1100 Spirit
Please Log in or Create an account to join the conversation.