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gooba
50cc nipper
Joined: 17 Feb 2007
Posts: 34
Location: newy
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 Posted: Sun Mar 25, 2007 10:19 pm Post subject: jetting / carb set up for 06 ltz400 |
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| Already has -full system ,k/n filter 155 main jet , seems abit flat on the beach when we replaced the slip on with full system - it seems down on torque / low to mid range - but starts ok and runs smoove .Not sure whether to get bigger jets or look at needle set up as well.any suggestions from beach users preferably . |
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Sponsor
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dusty
90cc 2 stroke / 110 4 stroke
Joined: 17 Jan 2007
Posts: 82
Location: JIMBOOMBA QLD
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| Posted: Mon Mar 26, 2007 6:26 pm Post subject: |
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have got 167 main with lid off . had same problem
0439211332
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yfz450,ltz400,blaster200,lt50 GO HARD OR GO HOME |
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dusty
90cc 2 stroke / 110 4 stroke
Joined: 17 Jan 2007
Posts: 82
Location: JIMBOOMBA QLD
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| Posted: Tue Mar 27, 2007 6:51 pm Post subject: jet |
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that was a drama mate , do not care if wrong  stripped 3 bolts but found 162.5 main jet champ
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yfz450,ltz400,blaster200,lt50 GO HARD OR GO HOME |
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gooba
50cc nipper
Joined: 17 Feb 2007
Posts: 34
Location: newy
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| Posted: Sat Mar 31, 2007 8:46 am Post subject: |
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| Got a dynajet kit -used 165 main , 3rd clip on the needle, 2 1/2 turns mixture screw - see how it goes sunday .Sounds fat last night when we set it up. Get some allen key bolts problem solved dusty!Thanks again mate. |
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greenhuman
Roostin Away
Joined: 12 Feb 2006
Posts: 980
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| Posted: Sat Mar 31, 2007 11:52 am Post subject: |
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| You will lose torque/ mid range with a full system. Generally, full systems have larger diameter headers . Smaller diameter headers promote torque, larger more revs. The people you got it off should have told you that, but they probably didn't know. |
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SIKMIC
Moderator
Joined: 29 Jun 2006
Posts: 1112
Location: Moranbah Qld
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| Posted: Sat Mar 31, 2007 6:15 pm Post subject: |
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I remember reading on another forum that the larger diameter header pipe (within Reason) will give you better torque. Reason being, when you are accelerating having a larger diameter exhaust allows more flow, the engine can rev out quicker, but when you start to get into the higher revs the flow increases to much and the engine starts scavenging, causing less top end. So basically, larger header diameter, faster reving, more snappy power/ torque. And then with a slightly smaller header diameter the flow will remain more constant when the engine is reving and everything is flowing fast.
Sounded sort of strange to me at fist but it makes sense. 
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Mic
YFZ450
Thanks to ATV's Unlimited &
Luke Beechey Motorsports
mic902@hotmail.com |
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WAT4
Blaster class
Joined: 21 Feb 2006
Posts: 175
Location: Mount Gambier SA
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| Posted: Sun Apr 01, 2007 11:15 am Post subject: |
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Mick, you've got it all backwards. John is correct in saying a larger diameter header will reduce bottom end torque. This is why high quality full systems will have a stepped header. The first section will be similar size to standard ( or even smaller like the GYTR full system I just fitted to an 07 YFZ) to keep or improve bottom end torque with the second larger section to improve flow at higher rpm and increase top end hp. Just goes to show. Do not beleive anything you read on any other forum
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DNA ATV Racing 09 KTM300EXC |
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SIKMIC
Moderator
Joined: 29 Jun 2006
Posts: 1112
Location: Moranbah Qld
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| Posted: Sun Apr 01, 2007 11:46 am Post subject: |
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My bad.  
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Mic
YFZ450
Thanks to ATV's Unlimited &
Luke Beechey Motorsports
mic902@hotmail.com |
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gooba
50cc nipper
Joined: 17 Feb 2007
Posts: 34
Location: newy
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| Posted: Mon Apr 02, 2007 9:52 am Post subject: |
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After an hour riding , We went another full turn - to 3 1/2 on the mixture -what a difference -running sweet as on the beach and nailed pagey's hill - plenty of torque and power .Worth the $99 spent at hardimans  . |
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