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Author Topic: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)  (Read 43714 times)


Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #171 on: Dec 14, 2015, 21:05:54 »
Not quite the same but, I'm using the Southern definition this time around.


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Offline DohcBikes

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #172 on: Dec 14, 2015, 21:14:42 »
I don't get it.
burning bridges sometimes light the most productive paths

Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #173 on: Jan 03, 2016, 22:35:03 »
  For those of you with a KZ440 having trouble jetting the stock carbs for pods. I may have a solution
for the problem. I just finished a little testing using a Dyno Jet kit for a KZ750/4. The differences
between the two are the main body casting and throttle butterfly. The 750 used a 34mm and the
440 used a 36mm. everything else interchanges. The slides on the 440 has 4 holes, 750 has 2.
Engine has the 750 pistons, reground cam, no filters and a freer flowing 2-2 exhaust. I used the
kits largest jets and lowered the jet needle one e-clip position from the directions. Stock 4 hole
slides with the holes drilled out were used first. Currently have 750 2 hole slides that have not been
drilled. It's just a little lean off idle with lowering the needle back down should be cleared up. I'll
be switching back to the stock cam and start reinstalling the fuel injection. While installing the
electronics the carbs will still be used and further tuning will be done.


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Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #174 on: Jan 25, 2016, 00:12:24 »
I got the jetting real close. The idle mixture screws are 5.5 turns out. That is to far.
Two new jets are coming from jet r us. I raised the jet needle one slot from what
DynoJet calls for the 750. This is with bare carbs, no filter of any kind. Fuel injection
electronics should be sorted enough to get it running. Next up will be checking out
all the plumbing for leaks. Below is a pic of the difference in jet needles.

From left to right... Dyno Jet w/shims, stock Keihin, stock Mikuni BS34. and a pair
for vm Mikunis.


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Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #175 on: Jan 31, 2016, 21:24:00 »
Started to reinstall the fuel injection plumbing.
As for the final settings on the stock 36cv Keihin carbs.
Largest jet in the DynoJet kit.
Jet needle raised one slot from kit instructions.
Stock 4 hole slides drilled with bit from kit.
38 Jets R Us pilots. (35 stock)
Idle mixture screws 1 1/2 turns out. (5 1/2 w/35s, now
has much better idle and off idle response)
This is with no filters what so ever leaving plenty of
room for tuning with a good set.


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Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #176 on: Mar 16, 2016, 08:10:52 »
Started to reinstall the fuel injection plumbing.
As for the final settings on the stock 36cv Keihin carbs.
Largest jet in the DynoJet kit.
Jet needle raised one slot from kit instructions.
Stock 4 hole slides drilled with bit from kit.
38 Jets R Us pilots. (35 stock)
Idle mixture screws 1 1/2 turns out. (5 1/2 w/35s, now
has much better idle and off idle response)
This is with no filters what so ever leaving plenty of
room for tuning with a good set.


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Switched to 40 pilots. My needle and seat were shot letting more fuel in.
Reinstalled the cam I reground. With the stock cam and cam timing
cranking compression was 175 on a fresh engine. With my cam it is
up to 180. I'm going to keep the carbs on this bike. The injectors do
not like being fired at 7500+ rpm on every revolution. I will have to
cut that in half by pulling my signal just off the cam. This means
another rocker box and cam to modify. Starting to work on my GPz
and two pickups and then life it's self have slow progress but I'm still
plugging away.


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Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #177 on: Nov 27, 2016, 00:37:04 »
I'm still around, just got a little side tracked lately.
Here's some pics I found of Mr. Hyde from a while back.
I'm going to take a little different approach from what
was done previously.

Offline canyoncarver

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #178 on: Dec 03, 2016, 00:52:02 »
So.  What new direction are you going?

--
KZ400 The Rabbit
YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
65 Norton, My damn Shovelhead chop
more YZF750R's, the KZ's, a Zephyr750...and the unfinished 75' CB550 cafe.
--

Offline doc_rot

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  • Oh the usual... I bowl, I drive around...
Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #179 on: Dec 03, 2016, 03:20:53 »
So.  What new direction are you going?
+1