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rc
4fiddy Racer
Joined: 11 Jun 2007
Posts: 266
Location: west oz
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 Posted: Thu Feb 14, 2008 8:46 pm Post subject: YFZ 450 carby jetting setup help |
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Hi all got a good mate who's replacing the standard jets with bigger ones to match the mods hes done.But at the moment it wont start or idle any setup ideas.
DRD exhaust
K@N filter
GYTR CDI the upgrade one
plus jets to match
anyone with similar setup who could help.We have a mx round on sunday so fingers crossed we can get this runnning.
Cheers for any ideas guys and gals. |
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Sponsor
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PeteW
Moderator
Joined: 09 Feb 2006
Posts: 1877
Location: Doreen, Vic
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| Posted: Thu Feb 14, 2008 8:53 pm Post subject: |
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what do you mean it won't start or idle, if it wont start how do you know it wont idle?
what sized jets did he go to?
is the DRD a full system or slip on?
is the K&N a stock replacement or Pro-Flow kit?
I usually go to a 45 pilot and 165 or 168 main as a base line setting.
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www.dirtcomp.com.au |
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rc
4fiddy Racer
Joined: 11 Jun 2007
Posts: 266
Location: west oz
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| Posted: Thu Feb 14, 2008 9:06 pm Post subject: |
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Sorry my mistake wont start
He's now just now put in a 45 pilot and 165 main. so might be the one and wot about the mixture screw
1 full turn etc.
bolt on exhaust
hiflow air cleaner. |
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PeteW
Moderator
Joined: 09 Feb 2006
Posts: 1877
Location: Doreen, Vic
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| Posted: Thu Feb 14, 2008 10:24 pm Post subject: |
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I'm presuming with all that that the air box lid is off.
try 1 1/2 to 2 turns out on the mixture screw. but that won't be stopping it from starting.
I know it's obvious but has he checked to see if there is fuel getting down into the carby bowl? maybe the float got stuck if he's had the bowl off to change jets.
check the connector on the ignition as the yammy one take a bit of pressure to seat properly, also try putting the std Ignition back on it to see if it'll start with that if he's still haveing problems.
_________________
www.thumbpump.com
www.dirtcomp.com.au |
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rc
4fiddy Racer
Joined: 11 Jun 2007
Posts: 266
Location: west oz
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| Posted: Fri Feb 15, 2008 12:45 pm Post subject: |
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| cheers petew is running sweet thanks heaps champ |
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450atvnut
Blaster class
Joined: 07 Jul 2006
Posts: 150
Location: Townsville QLD
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| Posted: Fri Mar 07, 2008 7:31 pm Post subject: |
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I just got a GYTR slip on exhaust. Will I need to change my jetting? I havn't fit it yet so not sure what to expect. Will it run like crap or even not run at all?
At the moment it has stock exhaust, GYTR airfilter and adapter and no idea what jets. |
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bigjon
Moderator
Joined: 17 Feb 2006
Posts: 1279
Location: Dubbo
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| Posted: Fri Mar 07, 2008 8:38 pm Post subject: |
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| 450atvnut wrote: | | I just got a GYTR slip on exhaust. Will I need to change my jetting? |
More than likely yes. Unless your running rich already which I doubt.
| 450atvnut wrote: | | I havn't fit it yet so not sure what to expect. Will it run like crap or even not run at all? |
It will still run but not to it's full potential.
| 450atvnut wrote: | | At the moment it has stock exhaust, GYTR airfilter and adapter and no idea what jets. |
Stock jetting?
Did the new pipe come with any jets?
A good place to start is 168 main, 45 pilot.
_________________
Don't close your eyes during the crash, you'll miss the best part |
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450atvnut
Blaster class
Joined: 07 Jul 2006
Posts: 150
Location: Townsville QLD
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| Posted: Sat Mar 08, 2008 9:16 am Post subject: |
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I have no idea what jets are in it. It wa a race bike and has had minor engine work. They couldnt tell me what had been done though.
The new pipe did not come with jets.
And recommendations on which jets kit is good value and who sells them? |
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bigjon
Moderator
Joined: 17 Feb 2006
Posts: 1279
Location: Dubbo
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| Posted: Sat Mar 08, 2008 1:09 pm Post subject: |
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| 450atvnut wrote: | | And recommendations on which jets kit is good value and who sells them? |
Either GYTR or JD is what I use.
The GYTR are available from Yamaha.
The JD should be available from most motorbike/quad shops.
_________________
Don't close your eyes during the crash, you'll miss the best part |
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450atvnut
Blaster class
Joined: 07 Jul 2006
Posts: 150
Location: Townsville QLD
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| Posted: Sun Mar 09, 2008 10:25 pm Post subject: |
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Cheers for that. I put the pipe on today, other than a low idle it seem to run smoother than before. Will have to check the jets. Thinking it may of been jetted for pipe by previous owner.
Thanks again for the advice. |
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