Main Jet 74 Z1 4-1 pods......
- bLodi
- Topic Author
- Offline
- User
The setup the bike has had for a long time while my dad owned it was stock pilots and 122.5 mains. Stock mains on the bike are 112.5
A couple years ago I went up to a 125 main and thought it was fine. However I felt like the bike just wasn't pulling as hard in the higher RPM as it should. I also noticed if I am cruising at say 3K rpm in 5th and go to WOT, the bike pulls, but kinda feels a bit boggy, if I back off the throttle a bit, the power comes on stronger. So I thought maybe putting the 122.5's in would help that. So I did and it did seem to pull a bit harder in the high RPM's, however the WOT bog at 3K in 5th issues still remains. I tried putting in a 117.5 tonight and again....seems to even pull slightly better in the high RPM's, but at low RPM's at WOT it falls a bit flat unless you back the throttle off a bit.
Any suggestions from you guys? Is the bog at WOT at low RPM just the nature of these carbs? Or Should I be going the other way...I have some 130's I could try....
Just looking for insight and suggestions.
Thanks.
www.blodisign.com
\\\\\\\'74 Z1
V&H 4-1 Header, Pod Filters, Dyna Ignition, Dyna Coils, Dyna Wires, lowering kit...much more.
Please Log in or Create an account to join the conversation.
- larrycavan
- Visitor
They're no powerhouse in 5th gear at 3K when you wack it full throttle. What happens at 4000 when you hit it like that?
Please Log in or Create an account to join the conversation.
- bLodi
- Topic Author
- Offline
- User
I know its not going to take off at 3K in 5th, but its just the fact that is seems to pull harder at less throttle at that RPM that bugs me.
I will have to try 4K and see......
www.blodisign.com
\\\\\\\'74 Z1
V&H 4-1 Header, Pod Filters, Dyna Ignition, Dyna Coils, Dyna Wires, lowering kit...much more.
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
- Posts: 18640
- Thank you received: 2098
Am assuming ignition timing is spot on (with strobe type timing light); and advancer is properly functioning without sticking; and visual check of plugs shows a healthy fat blue spark.
Good Luck!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- ArthurGoVroom
- Offline
- User
- I'd rather ride it than shine it
- Posts: 52
- Thank you received: 0
1976 KZ900A4, 4-1 header, rear lowering kit, grab bar removed, still shining and painting parts as time permits
Please Log in or Create an account to join the conversation.
- bLodi
- Topic Author
- Offline
- User
If not already done, would assure valve clearances are within specs.
Am assuming ignition timing is spot on (with strobe type timing light); and advancer is properly functioning without sticking; and visual check of plugs shows a healthy fat blue spark.
Good Luck!
Yup, I just adjusted the valves this spring.
I set the timing a couple summers ago with a strobe. The advancer is nice and free. I haven't checked the spark though...only thing I haven't done ignition wise is the WG coil mod.
www.blodisign.com
\\\\\\\'74 Z1
V&H 4-1 Header, Pod Filters, Dyna Ignition, Dyna Coils, Dyna Wires, lowering kit...much more.
Please Log in or Create an account to join the conversation.
- bLodi
- Topic Author
- Offline
- User
Mine too is boggy like you describe. I think it might just be the relatively low air velocity with the carb wide open when the engine not drawing much air. Carbs tend to work better (fuel atomizes better) when the air velocity is higher.
Thanks for the input. This is what I was wondering...anyone else with this experience?
www.blodisign.com
\\\\\\\'74 Z1
V&H 4-1 Header, Pod Filters, Dyna Ignition, Dyna Coils, Dyna Wires, lowering kit...much more.
Please Log in or Create an account to join the conversation.
- Russ Jackson
- Offline
- User
- Posts: 524
- Thank you received: 1
What kind of petcock are you using and have you checked float height? I have 29s on mine and a Pingle made a huge difference...Russ
1976 KZ 900 B1 29 smoothbores, Kerker, Lester Mags
2008 Kawasaki Concours 14 abs
Please Log in or Create an account to join the conversation.
- bLodi
- Topic Author
- Offline
- User
Running the stock petcock as far as I know...the float heights...boy I dunno, never checked them. What is a Pingle?but kinda feels a bit boggy, if I back off the throttle a bit, the power comes on stronger.
What kind of petcock are you using and have you checked float height? I have 29s on mine and a Pingle made a huge difference...Russ
www.blodisign.com
\\\\\\\'74 Z1
V&H 4-1 Header, Pod Filters, Dyna Ignition, Dyna Coils, Dyna Wires, lowering kit...much more.
Please Log in or Create an account to join the conversation.
- bLodi
- Topic Author
- Offline
- User
www.blodisign.com
\\\\\\\'74 Z1
V&H 4-1 Header, Pod Filters, Dyna Ignition, Dyna Coils, Dyna Wires, lowering kit...much more.
Please Log in or Create an account to join the conversation.