FZRSupport: the FZROnline Archive

I dont want to So This is a new thread on AFR"Air Fuel Ratio Gauge"
Im gonna throw up a quot of myself from other threads this was discussed in and than make adjustments to what I had said after I had done more testing today

it's a pretty easy mod.I dident go all out and get a wide band set up,that would run $150-$200 bucks.I just wanted something that would give me a good idea of whats going on.I picked up a sun pro AFR guage on amazon for $28 shipped and a denso 1 wire o2 sensor for $25 shipped on ebay.

I Drilled a hole in the header just past the collector and welded in a o2 sensor bung,hooked up the guage,sensor and thats it.

My bike was running a little rich,I knew that befor the guage,but thats why I got it to help tune in the carbs a little better.Come to find out yesterday I have 97 YZF 600 carbs with no jet kit and they were still set to factory settings.I drilled and pop out the A/F mixture caps # 1 was at 1 1/2 # 2 & 3 were at 2 and # 4 was turned all the way in.I turned them all to 3 1/2 and now the throttle response is a million times better.It's running on the first of 3 bars on the guage rich at idle and when I rev it up,it drops back in to the happy zone of a ideal mixture.

Ok after further testing it's still running rich at WOT.It's only when I let off when it drops to the ideal range.Im thinking I need to go down to 150's on the mains.And at idel it's going back and forth on the first and secon bar of rich,and allt he way rich on the throttle.

Heres the specs on the YZF Carbs

97 YZF 600
36mm Keihin downdraft carburetors
• Main Jet #155; CA mdl = #148
• Main Air Jet #80
• Jet Needle #1,4: N3FC #2,3: N1YF
• Needle Jet 2.6
• Pilot Air Jet 1 #140
• Pilot Outlet 0.9
• Pilot Jet #38

I think the stock carbs are what?33-34mm.Im not sure if it's the stock boots,but I suspect so because I have to use the force of god to get them in there.

Any way thats all for now.Heres a link to a video I took while testing.You can also here how my exhaust sounds with the R6 Header and choped can

FZR 600 AFR Gauge Test

I went and watched your video. Okay, you are rich when revving no load. What happens when you ride the bike and actually load the engine?

stock on most were 34mm Keihins I think

some of the bikes had crappier carbs

"by reelrazor on Tue Oct 07, 2008 7:13 pm"
I went and watched your video. Okay, you are rich when revving no load. What happens when you ride the bike and actually load the engine?

Thats a good question.and one I would like to answer and know my self,but until Vortex gets there heads out of there ass's and makes/sends me my sprocket "going on five weeks now" All I can do is look at the bike and spend all kinds of money on it waiting for it so I can ride the thing already I suppose I could put my old sprocket on,but with 21 teeth missing off of it all thats gonna do is break more teeth and screw up my new chain

FasterThanUr wrote:

"by reelrazor on Tue Oct 07, 2008 7:13 pm"
I went and watched your video. Okay, you are rich when revving no load. What happens when you ride the bike and actually load the engine?

Thats a good question.and one I would like to answer and know my self,but until Vortex gets there heads out of there ass's and makes/sends me my sprocket "going on five weeks now" All I can do is look at the bike and spend all kinds of money on it waiting for it so I can ride the thing already I suppose I could put my old sprocket on,but with 21 teeth missing off of it all thats gonna do is break more teeth and screw up my new chain

Okay. I wasn't in on the backstory-didn't know you weren't able to ride. I was gonna say I hope you aren't actually making changes based on what free revving the engine showed.

I am highly interested in the AFR setup, tho. And think that will be an investment for the near (winter) future for me. I'll prolly go with a diag. unit (datalogging) I can use on a number of machines. Been out of pro-wrenching for a while now and didn't realise the price had dropped as far as it has!

=by reelrazor on Tue Oct 07, 2008 11:05 pm"

Okay. I wasn't in on the backstory-didn't know you weren't able to ride. I was gonna say I hope you aren't actually making changes based on what free revving the engine showed.

I am highly interested in the AFR setup, tho. And think that will be an investment for the near (winter) future for me. I'll prolly go with a diag. unit (datalogging) I can use on a number of machines. Been out of pro-wrenching for a while now and didn't realise the price had dropped as far as it has!

I no it's gonna be different under load.The main reason I hooked this up is so I can see how the carbs react to the ram air system.Even with out the ram air it will be nice to know if my carbs are dialed in or not.

also

narrowband O2's are minorly useful, they read a very small range thats usuable, around 13-14 AFR, which is the range you want, but they are mostly good for telling you too lean or too rich, sorta


I have tuned a car off one without too many issues, but it wasnt a great tune

yeah narrowbands are almost pointless. I have an Innovative Wideband that I thought about slappin on the bike before.

well narrow bands ARE OK, but way less useful with carbs


mine told me what way to go with fuel to get the car into closed loop so it would worth a damn

innovates are good