Author Topic: My zilla lost it's balls and grew a **** (Read 4444 times)

ken500r · « **on:** May 29, 2013, 07:56:36 am »

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.

Dezsled · « **Reply #1 on:** May 29, 2013, 08:12:27 am »

Nice pic....

What pipe were you running before? Did you change your jetting for the DCS4?

ken500r · « **Reply #2 on:** May 29, 2013, 08:17:52 am »

I was running a FMF and i left the jetting the way it was.

Dezsled · « **Reply #3 on:** May 29, 2013, 08:23:19 am »

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?

ken500r · « **Reply #4 on:** May 29, 2013, 08:29:57 am »

I went to the dealer yesterday they did not have a jet bigger then a 430 i will try another dealer today.

Dezsled · « **Reply #5 on:** May 29, 2013, 08:34:58 am »

Yeah you'll think it's a stinky butt hole if you seize it

ken500r · « **Reply #6 on:** May 29, 2013, 08:38:20 am »

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

Dezsled · « **Reply #7 on:** May 29, 2013, 08:49:45 am »

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.

MotorGeek - Jerry Hall · « **Reply #8 on:** May 29, 2013, 09:03:58 am »

Quote from: Ken500R on May 29, 2013, 07:56:36 am

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?

ken500r · « **Reply #9 on:** May 29, 2013, 09:09:40 am »

After rebuild

ken500r · « **Reply #10 on:** May 29, 2013, 09:28:05 am »

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.

Dezsled · « **Reply #11 on:** May 29, 2013, 09:44:33 am »

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?

ken500r · « **Reply #12 on:** May 29, 2013, 09:47:46 am »

I ran it for about 20min

Buckeye513 · « **Reply #13 on:** May 29, 2013, 11:00:01 am »

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.

Motoman991 · « **Reply #14 on:** May 29, 2013, 12:09:26 pm »

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.

PCS · « **Reply #15 on:** May 29, 2013, 12:28:46 pm »

Quote from: Ken500R on May 29, 2013, 08:38:20 am

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

WestTexasKing · « **Reply #16 on:** May 29, 2013, 02:45:03 pm »

Why did you bore it while it was running good?
Thought you'd get more power from a bigger bore?

ken500r · « **Reply #17 on:** May 29, 2013, 02:59:50 pm »

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.

ken500r · « **Reply #18 on:** May 29, 2013, 03:10:03 pm »

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.

Dezsled · « **Reply #19 on:** May 29, 2013, 04:09:53 pm »

Does it run better than with the fmf?

ken500r · « **Reply #20 on:** May 29, 2013, 04:18:11 pm »

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.

Dezsled · « **Reply #21 on:** May 29, 2013, 06:58:18 pm »

Is it still a bearded clam? Or did its balls drop ? J/k

What main jet did you end up with?

LT250RWV · « **Reply #22 on:** May 30, 2013, 05:18:17 am »

You changed the reeds. Are they a different brand or the same kind you was using before.

GrkGuy · « **Reply #23 on:** May 30, 2013, 06:54:42 am »

your carb is in good hands, now just start doing some chin ups. you going to need strong arms to hang on. lol

ken500r · « **Reply #24 on:** May 30, 2013, 02:52:48 pm »

Well there it is all apart again. I'm sending the hole top end to halls precision racing

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Author Topic: My zilla lost it's balls and grew a **** (Read 4444 times)

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