My zilla lost it's balls and grew a ****

• My zilla lost it's balls and grew a ****
  Posted by ken500r on 29 May, 2013 07:56
• Please help me help my zilla get it's balls back. lol It has a 40 over wiseco piston cylinder is ported stock head dcs#4 pipe mikuni with a 22.5 pilot jet and a 430 main jet boyesen reeds k&n filter in box with the lid off. My problem is after half throttle there is no power.
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• #1 Reply
  Posted by Dezsled on 29 May, 2013 08:12
• Nice pic....
  
  What pipe were you running before? Did you change your jetting for the DCS4?
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• #2 Reply
  Posted by ken500r on 29 May, 2013 08:17
• I was running a FMF and i left the jetting the way it was.
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• #3 Reply
  Posted by Dezsled on 29 May, 2013 08:23
• Oh man...
  
  Yeah I'd go bigger on the main 2 sizes to start
  
  The DCS breathes better than the fmf, so your probably alittle lean now
  
  Mitch give you any recommendations?
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• #4 Reply
  Posted by ken500r on 29 May, 2013 08:29
• I went to the dealer yesterday they did not have a jet bigger then a 430 i will try another dealer today.   
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• #5 Reply
  Posted by Dezsled on 29 May, 2013 08:34
• Yeah you'll think it's a stinky butt hole if you seize it 
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• #6 Reply
  Posted by ken500r on 29 May, 2013 08:38
• The guys at the dealer looked at me like i was crazy when i told then i wanted a 450 main jet.
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• #7 Reply
  Posted by Dezsled on 29 May, 2013 08:49
• The best jetting suggestion I got was to find the lowest elevation you will be riding at, find a slight up hill stretch to rev out fourth gear, shut it down immediately, check the plug to make sure it's not white or light grey.
  
  I would get a 460 too.
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• #8 Reply
  Posted by MotorGeek - Jerry Hall on 29 May, 2013 09:03
• Quote from: Ken500R on 29 May, 2013 07:56

  Please help me help my zilla get it's balls back. lol It has a 40 over wiseco piston cylinder is ported stock head dcs#4 pipe mikuni with a 22.5 pilot jet and a 430 main jet boyesen reeds k&n filter in box with the lid off. My problem is after half throttle there is no power.
  

  
  When did the low power problem begin?
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• #9 Reply
  Posted by ken500r on 29 May, 2013 09:09
• After rebuild
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• #10 Reply
  Posted by ken500r on 29 May, 2013 09:28
• The motor was a strong running motor before the rebuild. All i did to the motor was bore it from 30 over to a 40 over and and went from fmf to dcs#4 and put new reeds. I think it is the carb i will try the 450 or 460 main jet then go from there.
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• #11 Reply
  Posted by Dezsled on 29 May, 2013 09:44
• How long have you been running the DCS with your current jetting.?
  
  The reason I ask is I've partially seized a piston before that exhibited a power loss.... Upon tear down rings were stuck where a slight scuff occurred. It was fixable... Emory cloth sanded the scuff, pulled the rings & reclearanced the ring land.
  
  Maybe do a compression check?
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• #12 Reply
  Posted by ken500r on 29 May, 2013 09:47
• I ran it for about 20min
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• #13 Reply
  Posted by Buckeye513 on 29 May, 2013 11:00
• Go fat on jetting and dial down way better to start fat rich than lean. I would get 520 500 480 460 main jet pack from mikuni they come in sets of 4 for like $12-$15 start extra rich ad work down that's what I plan in doing when I get my motor together. I'll rob ably start around the 580 - 560 range though but I'm running a q pipe and v2 reeds with a 9" k&n so more flow than your setup.
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• #14 Reply
  Posted by Motoman991 on 29 May, 2013 12:09
• Never trust the sizes printed on jets.  Always use a pin gauge!  You could also just take a drill bit and make the jet larger.
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• #15 Reply
  Posted by PCS on 29 May, 2013 12:28
• Quote from: Ken500R on 29 May, 2013 08:38

  The guys at the dealer looked at me like i was crazy when i told then i wanted a 450 main jet.
  

  My tri z 250 had a 470 main from the factory...go off what the plug is telling you
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• #16 Reply
  Posted by WestTexasKing on 29 May, 2013 14:45
• Why did you bore it while it was running good?
  Thought you'd get more power from a bigger bore?
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• #17 Reply
  Posted by ken500r on 29 May, 2013 14:59
• No i bored it 40 over because it needed to be honed and it could not be honed any more so i bored it 40 over.
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• #18 Reply
  Posted by ken500r on 29 May, 2013 15:10
• Well i was messing around with the carb got it to run much much better but still not right so i decided to send the carb to halls precision racing. I think i'm going to send him my head to get done too.
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• #19 Reply
  Posted by Dezsled on 29 May, 2013 16:09
• Does it run better than with the fmf?
  
  
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• #20 Reply
  Posted by ken500r on 29 May, 2013 16:18
• Lol yes it does, has a lot more power then the fmf. I cant wait to have that carb set up right. That thing is going to move.
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• #21 Reply
  Posted by Dezsled on 29 May, 2013 18:58
• Is it still a bearded clam? Or did its balls drop ? J/k
  
  What main jet did you end up with?
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• #22 Reply
  Posted by LT250RWV on 30 May, 2013 05:18
• You changed the reeds. Are they a different brand or the same kind you was using before.
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• #23 Reply
  Posted by GrkGuy on 30 May, 2013 06:54
• your carb is in good hands, now just start doing some chin ups. you going to need strong arms to hang on. lol
  
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• #24 Reply
  Posted by ken500r on 30 May, 2013 14:52
• Well there it is all apart again. I'm sending the hole top end to halls precision racing 
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