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ozquad44
Roostin Away
Joined: 28 Feb 2006
Posts: 518
Location: QLD then VIC now WA
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 Posted: Sun Mar 04, 2007 9:30 pm Post subject: JETTING and DYNOs YFZ450 |
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What jet sizes are you boys running in your YFZ fourfiddys. after doing a bit of research on the net I went to a 170main and 45 pilot which was the going thing in the States at the time I did it.
I've since spoken to a local bike tuner and he tells me that the Fuel here in OZ is different to the stuff in the states (to be specific its the specific gravity thats different) and he says that we can run leaner jets here in Australia.
Is anyone running a leaner jet than what I've done? The mods to my Quad consist of a GYTR slip on, Pro design filter, and the cam mod. TASALL...
P.S. Will a quad fit onto a car DYNO or do I need to find a go-kart one?
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State governments give us REC rego + area to ride ATVs legaly! State Status: VIC-No (Nazi's) QLD-Yes(no place to ride tho) NT-? NSW-Yes, Stockton. TAS-Yes, Areas for ATVs + ATV rego, Go Tazzie . WA-Yes, 2 top places within 1hr of Perth. ACT-? SA-No |
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Ozzy84
Moderator
Joined: 10 Apr 2006
Posts: 894
Location: Gold Coast QLD
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| Posted: Sun Mar 04, 2007 9:41 pm Post subject: |
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i think most people are putting em on bike dyno's and settin up a roller for the other wheel
better to be a little rich than a little lean to |
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blade
50cc nipper
Joined: 29 Dec 2006
Posts: 31
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| Posted: Sun Mar 04, 2007 9:44 pm Post subject: |
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| im pretty sure you can put them on a car dyno |
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PeteW
Moderator
Joined: 09 Feb 2006
Posts: 1877
Location: Doreen, Vic
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| Posted: Sun Mar 04, 2007 10:13 pm Post subject: |
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find a go-cart dyno or a bike dyno with a dummy roller, both of these will at least be calibrated to deal with the amount of HP a 450 is putting out.
Here's my jetting spec for my personal YFZ
MJ 165
PJ 45
FS1.5 turns out
JD Jetting Red Nedlle 3rd Clip
Thats for a Leo Vince quiet (FIM Spec) slip on DT1 Filter and YZ timed Cams with 12.5:1 piston.
With an MX pipe ( more open) and YZ cam then 168 - 170 is pretty well spot on just make sure your using good fuel and not that crap with extra ethanol in it.
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www.thumbpump.com
www.dirtcomp.com.au |
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REDTED
Roostin Away
Joined: 15 Jun 2006
Posts: 627
Location: Orange N.S.W
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| Posted: Mon Mar 05, 2007 5:33 pm Post subject: |
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Hey Pete, Are those jet numbers OEM or JD ?----Will you be at Canberra for the Vic Mx?  
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Cheers-Redted. 04 Raptor |
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bigjon
Moderator
Joined: 17 Feb 2006
Posts: 1279
Location: Dubbo
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| Posted: Tue Mar 06, 2007 9:29 pm Post subject: |
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Mine
'04 YFZ450
Stock engine.
Cam mod.
JMC header and hi-flow pipe with no baffle.
Pro-Design foam air filter.
Lid on.
168m
45p
#4 clip
2 turns out
Bike loves to be run rich.
Bike came out of factory way too lean.
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Don't close your eyes during the crash, you'll miss the best part |
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PeteW
Moderator
Joined: 09 Feb 2006
Posts: 1877
Location: Doreen, Vic
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| Posted: Wed Mar 07, 2007 10:25 pm Post subject: |
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| REDTED wrote: | | Hey Pete, Are those jet numbers OEM or JD ?----Will you be at Canberra for the Vic Mx? |
Hey REDTED, JD only use genuine Keihin Jets so OEM... yup I'll be up there on Sat morning.
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www.thumbpump.com
www.dirtcomp.com.au |
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