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Zinger712
50cc nipper
Joined: 12 Oct 2008
Posts: 4
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 Posted: Fri Nov 21, 2008 10:35 am Post subject: YFZ450 '05' Not running right |
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When I give my bike some hard throttle it gose like a rocket but when i sit on a curizing speed it seems to chough and fart. I have cleaned the carby out and checked the jets all seem ok. I have 150main jet I forgot to check the polit jet. And have a HMP pipe and K&N hiflow air filter with on air box cover. Could some HELP HELP ME 
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greenhuman
Roostin Away
Joined: 12 Feb 2006
Posts: 980
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| Posted: Sat Nov 22, 2008 4:47 pm Post subject: |
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Did you buy it this way or did you fit the pipe?
You should try a 165 main jet or better still get a complete jet kit with needle, main jets and pilot jet. You will get instructions as well. |
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bigjon
Moderator
Joined: 17 Feb 2006
Posts: 1279
Location: Dubbo
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| Posted: Sun Nov 23, 2008 10:21 pm Post subject: |
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Did you install the 150 main? 150 is way to lean! Do greenhuman's advice and go a 165 or maybe even a 168. Give greenhuman a call and get a jet kit from him.
Mine's an '07 with a 168 main, 45 pilot with cam-mod, motoworks air filter and baffle out. This is slightly rich at the moment but that will be fixed with my new AC full system yet to be installed.
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Zinger712
50cc nipper
Joined: 12 Oct 2008
Posts: 4
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| Posted: Mon Nov 24, 2008 5:00 pm Post subject: |
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i bought the bike with the 150 jet and the pipe already on it
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No drugs or rum bottles
Just thumb and full throttle |
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Raptor700
50cc nipper
Joined: 14 Sep 2008
Posts: 31
Location: perth
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| Posted: Mon Nov 24, 2008 6:33 pm Post subject: |
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Go with greehuman. Go the kit and you cant go wrong. Better off starting from scratch when you have bought a problem off someone else.
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Yamaha Raptor 700CC
Yamaha Raptor 50CC
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PeteW
Moderator
Joined: 09 Feb 2006
Posts: 1877
Location: Doreen, Vic
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| Posted: Wed Nov 26, 2008 12:40 pm Post subject: |
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I agree, 150 is way lean.
The best jetting kit for FCR carbs is from JD Jetting, you can get them from www.mainjetmotorcycles.com here in OZ.
you should be looking at least at a 45 PJ and 165 to 168 MJ.
Get you self an externally adjustable fuel screw while your at it. make a big difference to be able to adjust it up to siut the condtions.
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www.thumbpump.com
www.dirtcomp.com.au |
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Quad Squad
Blaster class
Joined: 05 Apr 2007
Posts: 193
Location: Melbourne
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hustleratv.com.au
The Day Starts With OZATV !
Joined: 26 Jan 2007
Posts: 1022
Location: Adelaide
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| Posted: Wed Nov 26, 2008 4:21 pm Post subject: hi |
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put the airbox lid back on if you have it and see if that helps
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PeteW
Moderator
Joined: 09 Feb 2006
Posts: 1877
Location: Doreen, Vic
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| Posted: Wed Nov 26, 2008 8:10 pm Post subject: |
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| Quad Squad wrote: | Does the jet have a little "star" emblem next to the #150?
If not, it may be a Dynojet jet, a 150 is the equivilant of a 165 Keihin jet. |
yeah good point adam. It may have been jetted already, it might pay to check with the guy you bought it off to see what got done?
also it would pay to check you exhaust gasket and also the join where the header meets the muffler to make sure there are no leaks back into the exhaust system.
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www.dirtcomp.com.au |
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bullet
The Day Starts With OZATV !
Joined: 09 Sep 2006
Posts: 1518
Location: Middleton SA
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| Posted: Wed Nov 26, 2008 11:12 pm Post subject: |
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If you've got a second hand bike with various bits on it...
the best way to set your mixtures right is to get it on a dyno with someone experienced in that model quad.
That way 'you' (the new owner) will know it has at least been set up right after all the changes.
Knowing your starting point will really help you if it seams a bit off colour or something else goes wrong down the track.
I'd highly recommend QuadSquad.
It will probably come up as requiring a 165 main as most of the blokes have said on here...
but it would be nice to know, and not find out by melting something.
Because it does sound lean
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