- Posts: 751
- Thank you received: 20
stock 1978 kz1000 but it has a "Kawasaki by Kerker
- newOld_kz1000
- Topic Author
- Offline
- User
- FlimFlamFlibbityFlee !! BoonFryedShickaMuhZee !!
The old gentleman I got it from said it was all stock except the 4-into-1 exhaust -- and the pipe says "Kawasaki by Kerker" -- I don't remember it but I guess back in the 1970s, Kaw had some arrangement with Kerker. The pipe looks just like a regular aftermarket Kerker pipe from those days.
So the carbs: all stock jetting. He said he just put the Kerker on and didn't change the jetting at all (probably will run lean once I get it running again!)
The airbox: all stock *except* the rearmost large, black plastic 'snorkel from outer space' is not there. I know what this missing piece looks like as I owned a brand new 1977 kz1000 back in 1977. This plastic snorkel box connects to the actual airbox that has the air filter element in it. This (stock) snorkel box is not on this hand-me-down '78 kz1000, only the stock air filter + air filter case is there with the stock carb boots, etc.
I betcha the bike will run lean -- what pilots and mains should I go to? In my view, there are 2 factors:
1) more air coming into the carbs due to the missing black snorkel box
2) more air flowing out at the exhaust part of the 4-stroke cycle due to the less restrictive Kerker.
Any ideas what # mains and what pilots to go to?
Or any other changes I'll need to make?
Thanks! I sold my '77 kz1000 when I went to college and I'm really looking forward to getting this one going!
1978 kz1000 A2 with Kerker
1980 Z1 Classic with Kerker
Please Log in or Create an account to join the conversation.
- Old Man Rock
- Offline
- User
- Posts: 6224
- Thank you received: 225
Now keep in mind, with that Kerker they most likely re-jetted...
As for being lean, review below what was OEM stock jet sizes (OEM exhaust) and compare to what you have in there now...
1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter
Phoenix, Az
Please Log in or Create an account to join the conversation.
- ndeli55
- Offline
- User
- Posts: 40
- Thank you received: 0
1978 kz650B stock
1973 rd250 (in 1000 pieces)
Please Log in or Create an account to join the conversation.
- Gman
- Offline
- User
- Posts: 147
- Thank you received: 5
1978 KZ1000
1965 Harly Electra Glide
2002 Gold Wing
1974 Z1 900 project
Please Log in or Create an account to join the conversation.
- newOld_kz1000
- Topic Author
- Offline
- User
- FlimFlamFlibbityFlee !! BoonFryedShickaMuhZee !!
- Posts: 751
- Thank you received: 20
If that's your machine I like the color.
1978 kz1000 A2 with Kerker
1980 Z1 Classic with Kerker
Please Log in or Create an account to join the conversation.
- Gman
- Offline
- User
- Posts: 147
- Thank you received: 5
1978 KZ1000
1965 Harly Electra Glide
2002 Gold Wing
1974 Z1 900 project
Please Log in or Create an account to join the conversation.
- newOld_kz1000
- Topic Author
- Offline
- User
- FlimFlamFlibbityFlee !! BoonFryedShickaMuhZee !!
- Posts: 751
- Thank you received: 20
Thanks for your help. Wish my '78's paint looked like yours!
1978 kz1000 A2 with Kerker
1980 Z1 Classic with Kerker
Please Log in or Create an account to join the conversation.
- Gman
- Offline
- User
- Posts: 147
- Thank you received: 5
1978 KZ1000
1965 Harly Electra Glide
2002 Gold Wing
1974 Z1 900 project
Please Log in or Create an account to join the conversation.
- txturbo
- Offline
- User
- Ex-Kawasaki Mechanic 1981-1985
- Posts: 81
- Thank you received: 0
1984 ZX750 E1 GPz Turbo
1984 ZX1100 A2 GPz
1984 ZX900
1996 KZ1000P Police bike
1970 Honda CT 70H 4sp manual
1965 Honda Dream 305
2003 Honda Shadow 1100
1971 Suzuki MT50 Trailhopper
1969 Camaro SS
1966 Impala
1966 Impala SS 427/4spd
Please Log in or Create an account to join the conversation.
- newOld_kz1000
- Topic Author
- Offline
- User
- FlimFlamFlibbityFlee !! BoonFryedShickaMuhZee !!
- Posts: 751
- Thank you received: 20
I'm at sea level in Silicon Valley, so there's more
air here than, say, Denver -- that means the amount
of gas will have to be increased to match the extra air.
Here's my thinking: this '78 kz1000 was gotten from the original owner who rode it here in Silicon Valley its entire lifespan, and the bike was bought at the local Kaw dealer in 1978, so it probably was set up for sea level.
That means probably has 105 mains and 15 pilots in it based on Mr. O.M. Rock's chart above, but I'll check that today when I retrieve the carb bits out of my Berryman's carb cleaner.
If I find that to be the case, the suggestion of going to 17.5 pilots and 110 mains may do the trick, as the amount of extra air flow is probably minimal on the carb intake side -- what with the stock airbox and filter still in place. The only thing missing on the airbox side is the black plastic snorkel box that connects to the actual airbox contains the air filter element. With that exception, everything's stock: carb-to-airbox rubber boots, airbox, filter element.
And the 'Kawasaki by Kerker' 4-into-1 is a street-baffle (not a racing-baffle) pipe, so the 110 mains (up from 105) may also be fine, as the exhaust is not flowing a ton of extra gas volume over the stock pipes (I'm guessing here).
HOWEVER -- from my 2-stroke street bike experience, we always tried to figure out what larger jet sizes to go to for our engine mods then we went up one jet size larger, then checked the bike out, then reduced the jets until we got good plugs readings. It's really critical on a 2-stroke because every time the piston moves to the top of the bore you get ignition, whereas with my kz1000, it's a little cooler in there, piston only fires every other time.
So.....guess what I'm asking......is it wise to maybe go up to 115 mains, and maybe 20 pilots, then drop back to 110s and 17.5s if the plugs are rich with 115s and 20s?
I haven't ever personally rejetted a 4-stroke motor, only 2-strokes. I always let mechanics do the 4-stroke rejets for me.
1978 kz1000 A2 with Kerker
1980 Z1 Classic with Kerker
Please Log in or Create an account to join the conversation.
- barkers41
- Offline
- User
- Posts: 9
- Thank you received: 0
i've just bought that 1982 kz1000
- mikuni 34mm
- k&N pods
- 4 into 1 exhaust
- carbs mixture screw 2 turns out
- floats ajusted 17 mm
- pilots 17.5
- jets 132.5
- needle jet in mid-position (third of 5)
and the carb is clean
theses are my symptoms:
on neutral, rpm 0 to 10k everything perfect
in gear when accelerating
rpm 0.750k to 4-4.5k everything's running good than it 5k start burping like crazy even full throttle no respond i tried also to close the choke while running ... to increase the amount of fuel no respond
after i drilled the jets with a 1/64 inch drill bit OMG ! worst worst worst !
is it a problem of jets and pilots setting or i would say its look like a fuel pump problem ?
im lost what i should do?
thanks
Please Log in or Create an account to join the conversation.
- kzr750r1
- Offline
- User
- Posts: 447
- Thank you received: 9
Your missing some needed details to really get going.
Mikuni 34mm what? BS I'm assuming...
What Jets did you drill?
Do you have a shop manual for this bike?
barkers41 wrote:
hi guys
i've just bought that 1982 kz1000
- mikuni 34mm
- k&N pods
- 4 into 1 exhaust
- carbs mixture screw 2 turns out
- floats ajusted 17 mm
- pilots 17.5
- jets 132.5
- needle jet in mid-position (third of 5)
and the carb is clean
theses are my symptoms:
on neutral, rpm 0 to 10k everything perfect
in gear when accelerating
rpm 0.750k to 4-4.5k everything's running good than it 5k start burping like crazy even full throttle no respond i tried also to close the choke while running ... to increase the amount of fuel no respond
after i drilled the jets with a 1/64 inch drill bit OMG ! worst worst worst !
is it a problem of jets and pilots setting or i would say its look like a fuel pump problem ?
im lost what i should do?
thanks
KZ750R1 + 1991 ZR750 = KZR750R1
Better to be shot out of a cannon then squeezed through a tube. - HST
Please Log in or Create an account to join the conversation.