QRS Jetting troubles

[Tripyn]

First off, let me say I am very impressed with the QRS Full; not to loud not to soft. Bike sounds great! However, after reading all jetting recommendations both here and over at the .org I am still confused. Here is my setup:

06' 450R
HMF Needle on 3rd clip
2 two inch holes in the lid, stock hole covered up
Boyseen Quick shot
Pro design K&N Filter
QRS full pipe
42 (stock) on the pilot
150 on the main
Screw at 1 3/4 turns out, idles perfect

When I check the plug ( not a new one, just cleaned really well) it is black and sooty. Also, when I was running WOT I pulled in the clutch and got off the gas it would stall. I looked at your dyno run of the 06' and tried that base jetting and it ran very, very rich and sputtered. The only thing I have not tried is running with no lid, that would be my next step. Anyway, very confused after reading for hours and thinking I had the jetting right with only a few minor changes from baseline suggestions. Any other suggestions guys would be great?

[Mike/HMF]

First off check this to see if this is how you are doing the plug check http://www.hmfengineering.com/forums/showthread.php?t=32

[motoz/HMF]

First off, let me say I am very impressed with the QRS Full; not to loud not to soft. Bike sounds great! However, after reading all jetting recommendations both here and over at the .org I am still confused. Here is my setup:

06' 450R
HMF Needle on 3rd clip
2 two inch holes in the lid, stock hole covered up
Boyseen Quick shot
Pro design K&N Filter
QRS full pipe
42 (stock) on the pilot
Too lean
150 on the main
Too lean
Screw at 1 3/4 turns out, idles perfect
1.75 is too lean especially with the 42 pilot.

When I check the plug ( not a new one, just cleaned really well) it is black and sooty.
Are you just pulling the plug or are you doing a throttle position specific throttle chop?

Also, when I was running WOT I pulled in the clutch and got off the gas it would stall.
That does not surprise me running a 150 main jet.


I looked at your dyno run of the 06' and tried that base jetting and it ran very, very rich and sputtered.
Did you do a throttle position specific plug check to verify this? and in which throttle position did it sputter?

The only thing I have not tried is running with no lid, that would be my next step.
Removing the lid will add more air thus leaning out the mixture. remember this.

Anyway, very confused after reading for hours and thinking I had the jetting right with only a few minor changes from baseline suggestions. Any other suggestions guys would be great?

***Use our baseline settings, then do throttle position plug checks to verify then adjust as needed until the desired plug color is reached.
http://www.dragstuff.com/techarticles/how-to-read-plugs.html

[Tripyn]

I agree that with a 150 main, 42 pilot and where the screw is that it should be way lean. However, plug and all the soot inside that new pipe tells me it is rich??

Are you just pulling the plug or are you doing a throttle position specific throttle chop?

I assume when you say throttle chop that means running it for a couple hundred yards at one throttle position, killing it and then pulling the plug, then yes.

Did you do a throttle position specific plug check to verify this? and in which throttle position did it sputter?

It seems to sputter in the 3/4 to WOT range. That would make sense to me with a 150 mainjet.

I will try running with no lid tonight in the 1/4 to 3/4 range with a fresh plug and see what I get. Then I will go back to your baseline settings and go from there.
Baseline to start:

165-175 on the main
45-48 on the pilot
3rd clip on your needle
2-3 turns out on the screw based on smooth idle.

I appreacite all the links you posted and I have been to them all before I even got into this to make sure it was something I can accomplish. I will try again because I get the same answer everywhere, which is I should be lean as hell! Again, thks for the replies guys.....great customer service and super pipes!

[motoz/HMF]

You do not indicate the conditions where you are, ambient temperature, elevation, etc.

Also, that airbox lid is restricted, I did all of our runs with the lid off. The (2) 1 inch holes you added are just not big enough to flow properly with our needle. You could run our suggested carb baseline settings AND be too rich because that airbox does not flow air. (that is why your pipe/plug is sooty/black)
Seeing as you are having problems in the 3/4 to wot that would expalin it.

Glad to be of help.

[Tripyn]

Sorry, that should have been the first thing I added. I'm in Florida ( Daytona Bch area) so almost at sealevel, and the temp here does not vary much this time of year, somewhere in the mid 70's. I have two 2" holes in the airbox with a K&N and the big metal barrell out of there. Thought this would increase air flow, run in to much water/sand to pull the lid.

So, with that setup can you suggest a starting point for jetting? Should I go back to the stock needle or drop a clip?

Murray.

[Tripyn]

I really have to thahk John, Mike and Dan for being so helpful. Even though I have been a pain in the a$$ the last few weeks they were still patient and listened with an open ear. John and I finally nailed it down yesterday; a missing spring that holds tension against the O ring on the pilot screw can ^%$&* everything. Lesson learned here; always watch for the little parts, if you lose them you never know what it is going to affect. At any rate, your customer service has been impressive and I would recommend this shop and their products to anyone. You all have a great holiday, and don't work to hard!

Murray.

[DD/HMF]

Thanks for the compliments Murray. Glad we could help.
Dan/HMF