- Posts: 476
- Thank you received: 1
Fine tuning main jetting
- savedrider
- Topic Author
- Offline
- User
- 1975 Z1-B 900
I currently have VM26 carbs with 120 mains, pods and 4-1 Kerker exhaust. My question is should I just go up one jet size at a time to get it right? I'm getting ready to order some 122.5 mains or should I go with 125's?
Thanks
Get right or get left! <*{{{><
Please Log in or Create an account to join the conversation.
- TeK9iNe
- Offline
- User
- What did you do!?!
- Posts: 2440
- Thank you received: 28
I would personally go with the 125's, but you may end up needing something larger to obtain max power.
Good luck!
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
Please Log in or Create an account to join the conversation.
- mark1122
- Offline
- User
- Keep twisting it
- Posts: 5359
- Thank you received: 109
what did u change to necessitate a jet change?
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.
~ ~ ~_@
~ ~ _- \,
~ (k) / (z)
Please Log in or Create an account to join the conversation.
- savedrider
- Topic Author
- Offline
- User
- 1975 Z1-B 900
- Posts: 476
- Thank you received: 1
Get right or get left! <*{{{><
Please Log in or Create an account to join the conversation.
- chance
- Offline
- User
- Life long biker/
- Posts: 583
- Thank you received: 0
Please Log in or Create an account to join the conversation.
- mark1122
- Offline
- User
- Keep twisting it
- Posts: 5359
- Thank you received: 109
Thanks for the input guys. Not sure what changed really. Other than that I'm not sure. Like I mentioned the problem only seems to really show when at night on the freeway when air temps are cool.
Do u see what i see?
I did clean the UNI foam pods recently and did not oil them as much as previously so they may be flowing better.
If they are indeed FLOWING BETTER, then u would be leaner leaner. try adding choke, to see if it helps.
:silly:
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.
~ ~ ~_@
~ ~ _- \,
~ (k) / (z)
Please Log in or Create an account to join the conversation.
- savedrider
- Topic Author
- Offline
- User
- 1975 Z1-B 900
- Posts: 476
- Thank you received: 1
I have the same setup and same jetting and have no bog at anytime.. Pulls red great
Well I sure hope the jetting fixes it, if not then I'm not out much $$$$. Maybe I should try adding choke like mark1122 says before spending any cash.
Get right or get left! <*{{{><
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
- Posts: 18640
- Thank you received: 2098
I'm having trouble with a bog at WOT at 60 mph + on the freeway. When I whack it wide open it does not pull to redline, just feels like it's starving for gas....
If not already done, would test run with fuel tank cap ajar, to determine whether there might be a tank venting problem.
Good Luck!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- savedrider
- Topic Author
- Offline
- User
- 1975 Z1-B 900
- Posts: 476
- Thank you received: 1
I actually had worked on a fuel leak I had on the gas tank fill neck recently. It always leaked fuel around the cap if I filled the tank past a certain level. Trouble was it had a ding in the fill neck and wasn't sealing properly.
Fairly recently I replaced the cap seal and did some bodywork to the fill neck. It doesn't leak gas anymore and I can fill it to the top now. Now I am wondering if the tank vent is working. That might make a lot of sense since I've had some starting trouble lately too and it seems like fuel wasn't getting to the bowls. Got a brand new Pingel fuel tap so the fuel tap definitely isn't the problem. Question, how do I go about getting the fuel cap to vent properly if I can determine it's not doing it's job?
Get right or get left! <*{{{><
Please Log in or Create an account to join the conversation.
- savedrider
- Topic Author
- Offline
- User
- 1975 Z1-B 900
- Posts: 476
- Thank you received: 1
Get right or get left! <*{{{><
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
- Posts: 18640
- Thank you received: 2098
Any foreign matter suspended in the fuel, such as paint over-spray, may hover about the petcock pick-up tube screens, and impede fuel flow into the petcock, especially under acceleration.
Petcock screens may quickly clog.
Could remove petcock and assure screen is clean.
And also flush tank by removing tank and swishing fresh gasoline inside and fast-dumping gas out the filler hole.
A clogged inline fuel filter may also cause fuel starvation.
Good Luck!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- mark1122
- Offline
- User
- Keep twisting it
- Posts: 5359
- Thank you received: 109
u should be able to unscrew the bottom from the tank cap and disassemble it, to check the vent.
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.
~ ~ ~_@
~ ~ _- \,
~ (k) / (z)
Please Log in or Create an account to join the conversation.