Bike bucking after Dynojet kit install

Hey all,

I've sorted out a lot of issues with the Kawasaki ZX9, but there is just one last thing.

I have installed a Dynojet stage 1 kit, with the recommended settings:

- Stock springs
- Dynojet Needle on groove #4 with 2 spacers above the e-clip
- DJ094 Main Jets (recommended for us with aftermarket pipes)
- Mixture screw out 1 and 3/4 turns

Bike Modifications: Full D&D Exhaust

Before this the bike ran well across the powerband, with the only deadspot at 2k or less. It wasn't terrible, but it was pretty bad.

Now the bike has the 2k or less deadspot (it seems slightly better), another deadspot followed by a surge at 3.25 - 4k and another at 4.5k -5k. These spots are extremely strong, and if an unsuspecting rider jumped onto my bike and tried to take off, the bike would surely buck the rider off. Power seems to be increased, but the bike cannot be ridden with these insane spots. The problem is a little better in second gear. Any ideas?

 

VERY informative.

Also, problem solved? I called up dynojet, explained my issue, gave them my serial number, and presto: I was using a dynojet kit made for a zx12, not a zx9. They looked up my info and saw that I had ordered the correct kit, but they had sent me the incorrect kit. I was handed off to a higher up, who was not nearly as friendly, and he was a POS.

First he wanted me to ship the incorrect kit back before he sent me a replacement. Then he didn't want to give me 2-day shipping even though I had ordered 2-day shipping on the first kit, and he was a little bitch about it. Now I think he also expects me to pay the return shipping on the first kit, which I'm not really angry about $5, but I'm not excited about it either. He also said UPS will pick it up, just before he hung up on me.

So... where do I address this package to? Am I just going to leave it here next to my pc, and UPS will come into my house, find it, and send it for me? What day are they coming.

"How am I going to get this kit back to you, do I need to package it up?"

"Your packaging. We'll issue a call order on it and UPS will pick it up. Have a nice day."

Click

???

He was gone as quick as he came, and all I know is that I will get mine in 2ish days, and invest even more man hours into the project. (We are already way past 40). So, I was happy with the first guy, Mike, (a tech agent), he even called me back when he said he would. "Stan", not so much. Screw Stan. If the kit works, I will forgive all of their wrong doings.

 

Two words: 1.) Factory, and, 2.) Pro.

I would have told him to suck a bag of dicks and sent him the kit back in a box full of dog shit. What goes around, comes around.


........

 

My guess would be that the needles were too rich...they were for a zx12 after all. I also guess that the taper was quite different from the zx9 taper, hence the dead spot, surge, dead spot, surge. The range in which he was having bucking issues weren't in the range of the main jets yet, however, they were most likely too rich also.



.........

 

Stock springs?? What springs?

You did not tell us if the intake was modified.
Groove #4 from top or bottom????

 

You are always so picky and critical Donald, but I still like having you on the forums.

Stock springs, meaning I used the stock carb slide springs instead of the shorter springs supplied with the kit. The shorter springs kill low end for better high, so you have an option to use either. What else could I possibly mean by stock springs?

I did not say if the intake was modified, because it was not. I also did not modify the kickstand, gearing, or turn signals.

Groove #4 - this can actually be confusing if you don't have the dynojet manual on you. The directions say put it at grove #4, and then later shows to count the groves from the top down.

 

I think I was rich, but I'm really not experienced enough to tell you. I've spent countless hours working on two bikes since joinging the forums, and for 98.8% of the entire time, they were not running. The airbox did not pop, but surprisingly the exhaust did not either. If I had to guess I'd say I was drowning the engine at the bog points, and then it would roar back to life. the 4k bog to power brought the front wheel up. I thought I was going to die. It was also pouring rain out, and I was just testing my handywork.

 

When I asked about the springs it was because I usually refer what was done to each carb. There is only one spring in each carb that is what threw me.

I can see why the bike is so rich now because you almost NEVER see the needle on the 4th notch from the top.
Matter of fact Factory Pro in San Rafael Ca. told me two notches is the max. (from stock).
When you say the bike is bucking I want to know does it back fire on acceleration OR on deceleration?
Did it require a lot of choke to get started or almost no choke to get started?
Will it idle?

 

They have been very nice to me and helped me a lot, and gave me good information.

 

Idles fine, a tad choke to get it started (it's cold here in NY) no backfiring whatsoever (which is weird if it's rich), and the bucking happens only at acceleration, the second wave bring the front wheel OFF of the ground, even if your your accelerating slowly.

Also, I just got a package from dynojet, it's the new kit and a prepaid sticker to send the old kit back in. I don't understand, he told me 5 days, I argued for 2, and then he changes his mind and gets this kit pulled and package from Las Vegas to NY in 15 hours. Wow. That's like, covert ops customer service. Make them hate you and then- SURPRISE! All better when you wake up.

Also, the needles are completely and totally different from each other. Not even close. This kit is actually very in depth compared to the other one, main jets, slide drill, needles, main air jet plugs?, crazy. I know what I'm doing today.

 

Let us know how it goes

 

I like Factory Jet kits/I like to avoid drilling the slides of my bikes if I can avoid it. Wonder what the tip of your exhaust looked like during your jetting tries. Maybe it was real sooty...Enjoy the experience. Ur one with your bike.

 

Yes I did, but even though it was the WRONG kit there was still information missing even if it had been the right kit.
Bully! LOL Haahhhahhhah

Remember this part?
"Groove #4 - this can actually be confusing if you don't have the dynojet manual on you. The directions say put it at grove #4, and then later shows to count the groves from the top down."

So when he does get the right kit we will know he did this part correctly.