cafed650 time to jet spot on!

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Re: cafed650 time to jet spot on!

20 Mar 2008 12:54
#201211
Here ya go!
[img
1977 KZ650C1
and the KZ650/KZ750 Conversion ;)

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Re: cafed650 time to jet spot on!

20 Mar 2008 15:30
#201239
wiredgeorge wrote:
The barrel jet with the #50 is OVER the pilot jet. It doesn't really have a whole lot of effect on the operation of the pilot jet which has a MUCh smaller hole and is really what controls fuel to the pilot circuit. With your set up, I would use #102.5 main jets and a #15 pilot jet (which is under the #50 jet). The #15 pilot jets are the stock size. I am not sure which jet needle you are using but it likely wouldn't hurt to clip to the 4th slot. The K&N drop in filter and 4 into 1 likely don't flow much more air than a stock filter and pipes. MOST 4 into 1 pipes actually don't flow much better, if at all, than the stock system.

will give that a shot and post back up...thanks WG
sept.1976 kz650
1980 kz650

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Re: cafed650 time to jet spot on!

22 Mar 2008 21:46
#201655
so where is the best source for jets?
sept.1976 kz650
1980 kz650

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Re: cafed650 time to jet spot on!

23 Mar 2008 08:54
#201712
z1 enterprises

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Re: cafed650 time to jet spot on!

23 Mar 2008 12:46
#201763
Have bought from Jeff many a time but didnt see em online...will email him
sept.1976 kz650
1980 kz650

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Re: cafed650 time to jet spot on!

24 Mar 2008 09:33
#201915
The jets aren't listed if you search by bike model at z1enterprises, I just type "jet" or "pilot" or "main" into the search box on top and it usually gets you to the jets you will need.

I just got in larger pilots from z1 for my 650 (4-1, pods) and I think once I get these in everything should be perfect so I will let you know my setup. I did take the #50's off.
77 KZ650 C1 (sold)
78 KZ650 B2 (sold)
78 KZ400 B1 (sold)
78 kz400 C1 (resto-mod)
78 kz400 C1 (hardtail low chop)
couple of possible project kz's in parts

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Re: cafed650 time to jet spot on!

24 Mar 2008 13:30
#201957
wiredgeorge wrote:
The barrel jet with the #50 is OVER the pilot jet. It doesn't really have a whole lot of effect on the operation of the pilot jet which has a MUCh smaller hole and is really what controls fuel to the pilot circuit. With your set up, I would use #102.5 main jets and a #15 pilot jet (which is under the #50 jet). The #15 pilot jets are the stock size. I am not sure which jet needle you are using but it likely wouldn't hurt to clip to the 4th slot. The K&N drop in filter and 4 into 1 likely don't flow much more air than a stock filter and pipes. MOST 4 into 1 pipes actually don't flow much better, if at all, than the stock system.

So I have yet to investigate what clip position the needle has but the jetting info you gave is exactly what I am running right now.

Some more info that I have on how the bike was running before I pulled the carbs. When ever a lot of throttle was given the bike would bog or if the throttle was bliped the bike would bog down if not die. the bike would run great from about half throttle onward but the bottom end was lacking.

I will find where the clip is on the needle and get back.

Thanks WG
sept.1976 kz650
1980 kz650

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Re: cafed650 time to jet spot on!

24 Mar 2008 17:50
#201993
Are you sure of your timing? I was having the exact issue you're describing on my 77 and it was mostly caused by the timing being off. After I got the timing set it was a matter of dinking just a bit with the airscrews to get it dialed in, no jetting change needed. Just throwing that out there...
09 Kawasaki ER6n
77 kz650b1 cafe rebirth project
"Being shot out of a cannon will always be better than being squeezed out of a tube, that's why God made fast motorcycles..."
Dr. Hunter S. Thompson
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Re: cafed650 time to jet spot on!

25 Mar 2008 00:28
#202043
anarki650 wrote:
Are you sure of your timing? I was having the exact issue you're describing on my 77 and it was mostly caused by the timing being off. After I got the timing set it was a matter of dinking just a bit with the airscrews to get it dialed in, no jetting change needed. Just throwing that out there...

Pretty sure my timing is spot on...new points and condensers timed with a craftsman timing light.

but you never know human error is rampant.
sept.1976 kz650
1980 kz650

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Re: cafed650 time to jet spot on!

25 Mar 2008 13:07
#202135
This is a great thread and has got me thinking....

Is it normal to have strong differences in performance that require carb tweaking over the span of a few hours.

Sometimes, after a great ride in before work, after work I can only get my bike to run smoothly by adding choke. :huh: Normal???

I believe that I need to delve in to my carbs as well is all.
77 KZ 650 C1.
77 KZ 650 C1.
Crashed-Repaired, Pods, Kerker pipe, re-wired core bundle, lamp upgraded, homemade rectifier, solid state regulator , Dyna-s ignition, repainted, slightly modified, year-round commuter
Honda Metro 85 mpg Scooter. Dont laugh I will throw it at you

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Re: cafed650 time to jet spot on!

26 Mar 2008 13:18
#202313
Any more thoughts?
sept.1976 kz650
1980 kz650

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Re: cafed650 time to jet spot on!

26 Mar 2008 13:41
#202321
scumbag wrote:

So I have yet to investigate what clip position the needle has but the jetting info you gave is exactly what I am running right now.

Some more info that I have on how the bike was running before I pulled the carbs. When ever a lot of throttle was given the bike would bog or if the throttle was bliped the bike would bog down if not die. the bike would run great from about half throttle onward but the bottom end was lacking.

That EXACTLY describes how mine ran after adding new headers. The fix: lower the clip on the jet needle to give maximum richness.

Understand why: from about "1/2 throttle up" the piston raises fully and the needle is all the way up and not restricting or metering flow. The amount of fuel is determined mainly by the size of the main jet.

But, at lighter throttle openings where the piston is only partly raised, the position of the needle with respect to the piston has a HUGE effect on fuel flow.
1979 KZ-750 Twin

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