Sqwrly
02-28-2012, 11:35 AM
I need help jetting this quad . I also have some dumb noob questions . But first I am going to start off with my mods .
13:5:1 Compression Ratio
Full DG X2 Pipe
Quadworks Air Filter
No Air Lid
Hot Cams Stage 2 Cam
Ok. So now the problem. I had stock jets in the quad and when I did it was strong and wicked fast . But it needed to be jetted with the work done too it . So I have a dynojet jet kit . Well we upped the main jet 2 sizes from what the paper said that came with the jet kit and we also only upped the pilot jet 1 size . Well now whenever I go to give it full throttle sometimes it will bust up almost like its getting too much fuel . So I called the honda tech today and he said that I need to try and go down 1 size since I went up 2 sizes . I need some opinions on what I should do ? I dont really know much about the carbs on these things and I could use a full write up step by step on jetting . I have done some research and I learned some new things but I still need some help on what I should do .
Also what screw is my Air/Fuel Ratio ?
And which is my idle to make sure its the right ones ?
Also are the numbers on top of the jet screws the numbers that I should be looking for or not ?
Also when people say turn my air fuel ratio screw out ? Does that mean clockwise or counter clockwise ?
Also the clip on the needle in the carb ? Lower the clip on the needle = richer or more lean ?
3leggeddog
02-28-2012, 01:01 PM
Also what screw is my Air/Fuel Ratio ?-The air fuel screw is located on the bottom of the carb. In the front, near the head side of the carb.
And which is my idle to make sure its the right ones ? The idle screw should have a black knob on it. Either on the shifter side of the carb on 04-05, or up front under the tank on the brake side on 06-07
Also are the numbers on top of the jet screws the numbers that I should be looking for or not ?- The numbers are on the side of the jet, IE: 160-170-172-175 ETC. on the main, or in the 50's for a pilot.
Also when people say turn my air fuel ratio screw out ? Does that mean clockwise or counter clockwise ? _turn it right to left, or clockwise, as to loosen it. That puts less of the "screw" in the carb
Also the clip on the needle in the carb ? Lower the clip on the needle = richer or more lean ?-The lower the clip the more fuel you allow to pass by the needle, so the richer it gets, and vice versa.
What jets are currently in the bike? I would GUESS you to need a 158-162 main, and a 50 pilot, start with the needle in the center position. You want the air fuel screw between 2 and 2-1/2 turns OUT. The newer bikes/carbs, you have to have a special D shape tool to adjust it with the carb on the bike.
Hope that helps
trx400Rider
02-28-2012, 09:43 PM
Originally posted by Sqwrly
Ok . I am kinda confused. Which one is the main jet ? And which one is the pilot jet .
Im guessing the main jet would be the longer one ?
Then the pilot jet would be the short screw looking one ?
main jet is the small one. pilot is the long one with all the holes in it.
Dynojet jets are different. They may be numbered the same as OEM jets but actually they have a different inside diameter . say a stock 128 vs a dynojet 128, the dynojet in most cases is much larger than a 128
Ruf Racing
02-29-2012, 08:04 AM
It's water under the bridge now, but you should have stuck with the Keihin jets. You can make those Dynojets work, but their numbering system is confusing, when you need help. Just a guess, you should be running at least a 175-185 Keihin sized main. A 48-50 size pilot, the air screw 2 turns out. That is just a base to start with. Good luck! :D
Sqwrly
02-29-2012, 09:58 AM
Originally posted by trx400Rider
main jet is the small one. pilot is the long one with all the holes in it.
Dynojet jets are different. They may be numbered the same as OEM jets but actually they have a different inside diameter . say a stock 128 vs a dynojet 128, the dynojet in most cases is much larger than a 128
Ok . So what size dyno jets should I be running with my mods that I listed ? You know what scratch that . I will just buy a brand new FMF Jet kit that way I know I have evrything in it .
d3ktrix
02-29-2012, 11:23 AM
Here this might help when comparing diff brand jet sizes
Example, if someone tells u to run a 165 Keihin, u know its equal to a 150 Dynojet main.
Width------Keihin # -- DynoJets # -- Mikuni #
0,0350---- 92,5--------- 92----------- 86,3
0,0360---- 95----------- 94----------- 88,1
0,0370---- 97,5--------- 96----------- 90,0
0,0380---- 100---------- 98----------- 91,9
0,0390---- 102,5------- 100---------- 93,8
0,0400---- 105--------- 102---------- 95,6
0,0410---- 107,5------- 104---------- 97,5
0,0420---- 110--------- 106---------- 99,4
0,0430---- 112,5------- 108--------- 101,3
0,0440---- 115--------- 110--------- 103,1
0,0450---- 117,5------- 112--------- 105,0
0,0460---- 120--------- 114--------- 106,9
0,0470---- 122,5------- 116--------- 108,8
0,0480---- 125--------- 118--------- 110,6
0,0490---- 127,5------- 120--------- 112,5
0,0500---- 130--------- 122--------- 114,4
0,0510---- 132,5------- 124--------- 116,3
0,0520---- 135--------- 126--------- 118,1
0,0530---- 137,5------- 128--------- 120,0
0,0540---- 140--------- 130--------- 121,9
0,0550---- 142,5------- 132--------- 123,8
0,0560---- 145--------- 134--------- 125,6
0,0570---- 147,5------- 136--------- 127,5
0,0580---- 150--------- 138--------- 129,4
0,0590---- 152,5------- 140--------- 131,3
0,0600---- 155--------- 142--------- 133,1
0,0610---- 157,5------- 144--------- 135,0
0,0620---- 160--------- 146--------- 136,9
0,0630---- 162,5------- 148--------- 138,8
0,0640---- 165--------- 150--------- 140,6
0,0650---- 167,5------- 152--------- 142,5
0,0660---- 170--------- 154--------- 144,4
0,0670---- 172,5------- 156--------- 146,3
0,0680---- 175--------- 158--------- 148,1
0,0690---- 177,5------- 160--------- 150,0
0,0700---- 180--------- 162--------- 151,9
0,0710---- 182,5------- 164--------- 153,8
0,0720---- 185--------- 166--------- 155,6
0,0730---- 187,5------- 168--------- 157,5
0,0740---- 190--------- 170--------- 159,4
0,0750---- 192,5------- 172--------- 161,3
0,0760---- 195--------- 174--------- 163,1
0,0770---- 197,5------- 176--------- 165,0
0,0780---- 200--------- 178--------- 166,9
0,0790---- 202,5------- 180--------- 168,8
0,0800---- 205--------- 182--------- 170,6
0,0810---- 207,5------- 184--------- 172,5
0,0820---- 210--------- 186--------- 174,4
0,0830---- 212,5------- 188--------- 176,3
0,0840---- 215--------- 190--------- 178,1
0,0850---- 217,5------- 192--------- 180,0
0,0860---- 220--------- 194--------- 181,9
0,0870---- 222,5------- 196--------- 183,7
0,0880---- 225--------- 198--------- 185,6
0,0890---- 227,5------- 200--------- 187,5
d3ktrix
03-01-2012, 06:04 PM
What size jets are u running now?
Need actual numbers, saying "2 sizes up " doesn't mean anything to us.
Need to know the main jet size, the pilot size and if you moved the needle.
And your saying it stumbles when your wide open throttle?
How is the throttle response off idle?
Does it pop on decel in 1st-3rd gear when coming back down from high RPM?
Sqwrly
03-05-2012, 01:55 PM
Originally posted by d3ktrix
What size jets are u running now?
Need actual numbers, saying "2 sizes up " doesn't mean anything to us.
Need to know the main jet size, the pilot size and if you moved the needle.
And your saying it stumbles when your wide open throttle?
How is the throttle response off idle?
Does it pop on decel in 1st-3rd gear when coming back down from high RPM?
Im not even sure what the sizes in it now are . I know the needle is in the middle and the throttle response off idle is pretty decent but not when im in gear and yes it does pop .
d3ktrix
03-05-2012, 03:47 PM
Originally posted by Sqwrly
Would anyone happen too know what size jets come in a 2007 450er stock ? Cause I cant find my stock jets and I have too buy new ones .
Well the stock size jets are no use to u with those mods, so why buy new ones?
The recommended starting point for a bike with an exhaust/open air box is 165main and 45 pilot with the A/F screw 2.5 turns out. That is in Keihin sizes
If you going by dyno jet sizes, that would be around a 150.
Not sure how the pilot sizes compare but you can just change that by how the bike runs.
You said you are getting popping, is it when u let off the throttle? or when ur on it also?
What is your A/F screw set at? or did you leave it where it was?
Sqwrly
03-07-2012, 05:24 PM
Originally posted by d3ktrix
Well the stock size jets are no use to u with those mods, so why buy new ones?
The recommended starting point for a bike with an exhaust/open air box is 165main and 45 pilot with the A/F screw 2.5 turns out. That is in Keihin sizes
If you going by dyno jet sizes, that would be around a 150.
Not sure how the pilot sizes compare but you can just change that by how the bike runs.
You said you are getting popping, is it when u let off the throttle? or when ur on it also?
What is your A/F screw set at? or did you leave it where it was?
Popping only happens at higher rpms when I let all the way out of the throttle .
d3ktrix
03-07-2012, 08:13 PM
Originally posted by Sqwrly
Popping only happens at higher rpms when I let all the way out of the throttle .
Start turning the Air/Fuel screw out until that popping goes away.
But don't go farther then 2.5 turns out from all the way in or else it will fall out.
If u have to go more then 2.5 turns put on the Air/Fuel screw, then go one size larger on the pilot jet.
Did you try any different main jets yet?
I can't help u tune it perfect over the internet, but hopefully give a few tips to at least make it rideable.
Sqwrly
03-08-2012, 11:04 AM
Originally posted by d3ktrix
Start turning the Air/Fuel screw out until that popping goes away.
But don't go farther then 2.5 turns out from all the way in or else it will fall out.
If u have to go more then 2.5 turns put on the Air/Fuel screw, then go one size larger on the pilot jet.
Did you try any different main jets yet?
I can't help u tune it perfect over the internet, but hopefully give a few tips to at least make it rideable.
I apologize for the lack of information but I am new too this . I accidentally screwed the air/fuel screw out too far and my screw fell out . So I am gonna buy a new one today . But is there anyway you could take a picture of a carb and draw an arrow too the pilot jet . I apologize for the inconvenience. This is also a little off topic But also I am about to do my first oil change . How many quarts do I need and exactly how too change the oil ? So I don't mess anything up.
d3ktrix
03-08-2012, 11:48 AM
Originally posted by Sqwrly
I apologize for the lack of information but I am new too this . I accidentally screwed the air/fuel screw out too far and my screw fell out . So I am gonna buy a new one today . But is there anyway you could take a picture of a carb and draw an arrow too the pilot jet . I apologize for the inconvenience. This is also a little off topic But also I am about to do my first oil change . How many quarts do I need and exactly how too change the oil ? So I don't mess anything up.
When you buy a new A/F screw make sure u also get the o-ring, washer and spring that goes with it.
I recommend an aftermarket A/F screw that u can adjust by hand with a knob on it. The stock ones suck at adjust, esp the D shaped 06+ ones.
I'll find a carb pic when I get home.
Here is a scan of the Honda service manual showing the Oil Capacities.
Look at the "After 05" for your year bike.
It list engine and transmission capacities.
http://shared.sploitz.com/06_oil_specs.jpg
Sqwrly
03-11-2012, 06:46 AM
Originally posted by d3ktrix
Green arrow points to the pilot jet.
Thanks man ! I ended up taking my carb apart and I found my pilot jet . But what really ticks me off is I have bought 2 air fuel screws and have lost both of them . One that I bought didnt come with a spring or o ring . It just came with the screw and it was brand new . The other one was a trackside and it came with a spring, screw, and o ring but I think I backed it out too far for it too fall out .
Sqwrly
03-11-2012, 06:54 AM
The one with the yellow arrow pointing to it which one is that ? Slow jet ?
Update : I got the air/fuel screw in and I finally got it too stay so far . But my issue now is starting it . It wont start under its own battery when you first start it up, I have too jump it off with one of the vehicles and too me when its turning over it sounds like its trying to start up like its half running but when I jump it too a car battery it turns the motor over faster and it fires up easier . I think this would be involving my pilot jet .
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