Jetting, basic FCR carb and jet location pictures - Page 2 - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums

houghkyle · 10-19-2011, 04:22 PM

What is the best way to test if the jetting is correct? In the past I have looked at the spark plug. Is there a better way to tell if you are jetted correctly?

bcable01 · 10-21-2011, 01:54 PM

So I am setting my bike up for ice racing in a couple weeks. I've got a hmf qrs pipe. And I'm wanting to rejet my bike. And every one I've seen on here is no where near the temps that we ride in here (Alaska). Average temp is going to be around 0 degrees give or take 10-20 degrees in both directions. Does anyone have any suggestions on the jetting I should do. I have my bike torn apart and trying to figure out what to jets to use. I have the gytr kit with all the different jets and an adjustable pin. Thanks

08 YFZ 450 · 01-09-2012, 10:29 PM

I live in so cal...i bought a moose jet kit..i have a 168 main jet.the moose kit comes with diffrent #....it tells me to run a cj 165 and a dpjmo 48 pilot jet and one turn back on the air fuel screw..and neddle on groove 3 from the top...does that sound right..sorry so many ? ?..first time jetting..Thanks..any input would help

cbohenek · 01-31-2012, 12:21 AM

I have a 2005 yfz with the following mods..and i need advice for the proper jet setting..
Yoshimura slip on
Jet kit
K&n pro flow filter w lid box off
—------------
Now when i drive it, its not getting enough fuel. It backfires a bit and when im going and hit the throttle it sometimes misses a beat. Its not terrible but definitely not set right. Now when i pull the choke to 1/2 choke it runs A Lot better but still backfires and misse a beat but not as bad with the choke off.
Does anyone know if adjusting the air/fuel screw will help? And what settings should i use?

yfzboner · 02-06-2012, 09:12 PM

Very helpful. Newbie here to all this. Bought a 08 yfz450 and it won't idle without choke on. Bone stock. 20 hrs or under. Drained gas, added 93 and sea foam, took off bowl today and cleaned jets etc. seemed to be good before. New spark plug. Didn't mess with fuel screw yet. Should I seat it and go 2 out and adjust from there? Central il, and it's pretty cold here.

berryna · 03-26-2012, 01:57 AM

at least we can simply send them to this thread...good job Husker.

01-09-2012, 10:29 PM	#23 (permalink)
08 YFZ 450 Junior Member Join Date: Jan 2012 Location: rancho cucamonga,ca Posts: 9	I live in so cal...i bought a moose jet kit..i have a 168 main jet.the moose kit comes with diffrent #....it tells me to run a cj 165 and a dpjmo 48 pilot jet and one turn back on the air fuel screw..and neddle on groove 3 from the top...does that sound right..sorry so many ? ?..first time jetting..Thanks..any input would help __________________ 2008 YFZ 450.BIG GUN EXHAUST,BIG GUN REV BOX,K&N INTAKE,

03-26-2012, 01:57 AM	#26 (permalink)
berryna Junior Member Join Date: Mar 2012 Posts: 3	at least we can simply send them to this thread...good job Husker. __________________ fluro cambridge satchel cambridge satchel review cambridge leather satchel

10-19-2011, 04:22 PM	#21 (permalink)
houghkyle Junior Member Join Date: May 2010 Posts: 27	What is the best way to test if the jetting is correct? In the past I have looked at the spark plug. Is there a better way to tell if you are jetted correctly?

10-21-2011, 01:54 PM	#22 (permalink)
bcable01 Junior Member Join Date: Oct 2011 Location: Anchorage, Alaska Posts: 6	So I am setting my bike up for ice racing in a couple weeks. I've got a hmf qrs pipe. And I'm wanting to rejet my bike. And every one I've seen on here is no where near the temps that we ride in here (Alaska). Average temp is going to be around 0 degrees give or take 10-20 degrees in both directions. Does anyone have any suggestions on the jetting I should do. I have my bike torn apart and trying to figure out what to jets to use. I have the gytr kit with all the different jets and an adjustable pin. Thanks

01-31-2012, 12:21 AM	#24 (permalink)
cbohenek Senior Member Join Date: Jan 2012 Location: 18344, mount pocono pa Posts: 180	I have a 2005 yfz with the following mods..and i need advice for the proper jet setting.. Yoshimura slip on Jet kit K&n pro flow filter w lid box off —------------ Now when i drive it, its not getting enough fuel. It backfires a bit and when im going and hit the throttle it sometimes misses a beat. Its not terrible but definitely not set right. Now when i pull the choke to 1/2 choke it runs A Lot better but still backfires and misse a beat but not as bad with the choke off. Does anyone know if adjusting the air/fuel screw will help? And what settings should i use?

02-06-2012, 09:12 PM	#25 (permalink)
yfzboner Junior Member Join Date: Feb 2012 Posts: 1	Very helpful. Newbie here to all this. Bought a 08 yfz450 and it won't idle without choke on. Bone stock. 20 hrs or under. Drained gas, added 93 and sea foam, took off bowl today and cleaned jets etc. seemed to be good before. New spark plug. Didn't mess with fuel screw yet. Should I seat it and go 2 out and adjust from there? Central il, and it's pretty cold here.

Remove Advertisements Sponsored Links
YFZCentral.com Advertisement