[Brad from Lasalle]

Hello, I am in search of one size 35 pilot jet as shown by the pictures. This goes in front of the slow jet. I needed to drill it out to get the slow jet out for cleaning. Please let me know if you have any possible source for one as my internet search has yielded nothing of this size. Thanks

 

[WFO-KZ]

xxhttps://www.z1enterprises.com/carburetor-kit-kz400-1974-75.html?fits-motorcycle=Kawasaki/KZ400/KZ400-D/1975

Cut and paste into browser and then remove xx from front of url.

 

[Brad from Lasalle]

xxhttps://www.z1enterprises.com/carburetor-kit-kz400-1974-75.html?fits-motorcycle=Kawasaki/KZ400/KZ400-D/1975

Cut and paste into browser and then remove xx from front of url.

Thanks but unfortunately that kit does not contain that specific jet even though the OEM refeference list shows it does. The picture does not have it shown , nor does the itemized list(it says Pilot jet but the picture actually shows the slow jet). I have not found a kit that does. For this carb the pilot jet is screwed in on top of the slow jet. i have attached my total jet count list on the picture. Thx

 

[WFO-KZ]

A few thoughts:

1) Is there any chance someone installed non OEM carbs on your bike?

2) Did you have to drill out both jets, or do you have one good one that can be photographed?

3) It may be worth a phone call to Z1 Enterprises to see if this can be sorted out. They might go and pull the actual kit and send you a photo. Web site photos could be wrong and parts lists could be wrong.

 

[Brad from Lasalle]

A few thoughts:

1) Is there any chance someone installed non OEM carbs on your bike?

2) Did you have to drill out both jets, or do you have one good one that can be photographed?

3) It may be worth a phone call to Z1 Enterprises to see if this can be sorted out. They might go and pull the actual kit and send you a photo. Web site photos could be wrong and parts lists could be wrong.

I do have the one good jet for the other carb, that is what is showing in the caliper pics that I measured. Apparently 1975 was the only year to have the double jet in that tube… of course it is… the carbs that were in the bike when I got it are actually from a 1976 Honda cb360 and I was trying to restore original.

 

[WFO-KZ]

Ok, now I understand. I still think it is worth a phone call to Z1. I have found them to be very helpful.

 

[Brad from Lasalle]

Ok, now I understand. I still think it is worth a phone call to Z1. I have found them to be very helpful.

Definitely will try that. Thanks

 

[Brad from Lasalle]

I contacted Z1 and he has now updated his kit wording to call out the slow jet vs the pilot jet. He did not have a 35 pilot jet but I did get a line on one from eBay which I ordered and now need to wait and see if it is the correct one. Expected delivery next Wednesday, fingers crossed. Tried running the bike without those and it runs very rich, no power over 5000 rpm and lots of black smoke. It definitely doesn’t like that.

 

[WFO-KZ]

That's great that you got Z1 sorted on their own parts listing.
Hopefully the part you ordered from Ebay will be the correct one. Was it new or used?

 

[Brad from Lasalle]

That's great that you got Z1 sorted on their own parts listing.
Hopefully the part you ordered from Ebay will be the correct one. Was it new or used?

They say brand new but not in original packaging.

 

[Brad from Lasalle]

the jets were new and the carbs are working better. Still not at 100% yet, but better. Sync‘d them and it sounds pretty good. A little cold to be doing a test run this morning, but will see how warm it gets later today. if I unplug the rh spark plug wire the bike will still limp on the lh cylinder, but if I unplug the lh plug wire the bike dies immediately. It’s like the rh cylinder is not producing power at idle, but the bike sounds like both are running, timing light shows they both are getting spark. Compression is slightly lower in that side, valve adjustments are good. throttle response seems good, no stutter at a quick turn either. If I do rev it up to 5k or more I am seeing black smoke out of the exhaust. I have a 2 into 1 exhaust on this bike. Jetting on the carbs are all stock values, I may need to reduce the secondary main or increase the air jet size. Will first read the plugs out once I can ride it.

 

[WFO-KZ]

If you do a cold start and let it idle for a minute or two, do both exhaust pipes get equally hot?
This is best measured with a non-contact thermometer or use gloves before the pipes get too hot.

If already answered, I apologize; are you running pods or stock airbox?

Normally if anything you need to increase jet size for mods like headers and pods. What is your thought process behind going smaller?

 

[Brad from Lasalle]

If you do a cold start and let it idle for a minute or two, do both exhaust pipes get equally hot?
This is best measured with a non-contact thermometer or use gloves before the pipes get too hot.

If already answered, I apologize; are you running pods or stock airbox?

Normally if anything you need to increase jet size for mods like headers and pods. What is your thought process behind going smaller?

from a cold start the lh header does warm up faster than the rh, however after running it for 10 mins at idle while setting the sync of the carbs I used my pyrometer and measured 297 degrees at the rh header where it enters the head, and 254 degrees on the lh one. So although the rh takes longer to heat up, it seems to get hotter. Will do this experiment again once the bike cools down. I am running the stock air box and filter. My reason for going to a smaller secondary main was the black smoke I am seeing when the bike is revving over 5000. I need to get it on the street and load up the motor before determining any next steps.

 

[Brad from Lasalle]

My son took it out today, every time he got on the throttle it blew black smoke out of the pipe. Then it would bog down once it hit 7000 rpm with more black smoke. Seems like too much fuel all around. Next step was to remove the stock filter and left the air box door off. There was definitely less black smoke but it still bogged down over 7k. Everything is stock except for the 2 into 1 exhaust pipe. The compression is good in both cylinders. He noticed the idle kept changing at each stop, some too low and it would stall then too high after he turned it up a very small amount.

 

[WFO-KZ]

That is so strange, have you checked float level with carbs installed? Is it possible the choke is remaining on or partly on?
Here are the factory carb specs in case you don't have this.

 

[Kawasakian]

Make sure your valves are all adjusted within specifications. When they are tight, they tend to do what your bike is doing as when the engine gets hot the valves won't close all the way.