Author Topic: 38 vs 42.5 mm (Read 2878 times)

Nopick · « **Reply #50 on:** November 23, 2013, 12:21:14 pm »

Yes. Stock needle and needle jet.

PowerStrokin · « **Reply #51 on:** November 23, 2013, 12:50:41 pm »

Quote from: PowerStrokin on November 22, 2013, 10:41:30 pm

I had my needles backwards in my head on my last post, so I modified it. I'm running the 7dh3. I want to try the 7dh2, since it is leaner. I screwed up when I originally bought my carb and ordered the snowmobile version. I've had to change so much crap around to get it to work right. I've lost track of a lot of stuff. Being a snowmobile carb it had the 7dh2 needle originally, but I have since lost it.

I researched the differences in the two versions of the carbs and noticed the snowmobile carb had a 0.7 air jet and the bike version had a 0.5 air jet. So I went to order the 0.5, but sudco didn't have it when I tried several years ago. So I'm curious if that is part of the problem also. The thing is, I have never found clarification as to which air jet is leaner. I am certain that a physically bigger air jet is leaner, but the scale could be inverted, for all I know, to save confusion, since larger numbers usually indicate richer in a carburator. (If that makes any sense)

So which way is it? Is 0.5 richer or leaner than 0.7?

Oh and thanks for the info on the needle jet change. Looking at the mikuni manual it looks like that will have the biggest effect on the range where mine is fat. I ordered an aa-0 and a 0.5 air jet and a 7dh2 needle. I'll start playing with it after I get everything put back together.

Frank · « **Reply #52 on:** November 24, 2013, 04:29:17 am »

But i found out the zilla runs very boggy without the 6dk3 needle on stock Carb , bore 87.5 , without portings,
PT Pipe, with air lead.

Buckeye513 · « **Reply #53 on:** November 24, 2013, 04:53:49 am »

Frank Powerstrokin is talking about the VM44.

Glamisrider · « **Reply #54 on:** November 24, 2013, 04:29:07 pm »

Derrick,
Back on the first page you said you'd run a lectrn if it wasn't 4-5 bills.

FYI: J-Zilla has one for sale with all the goodies in the 2 bill range.

http://www.suzukiquadracerhq.com/items-selling/lt500-parts-for-sale/

Buckeye513 · « **Reply #55 on:** November 24, 2013, 06:40:23 pm »

I saw that Bret but that's a 44. Is the Lectron a better 44 then the Mikuni? Shearer told me to get a 50mm Lectron for drag racing that's what I was referring to when I said 4 or 5 bills or more.

GrkGuy · « **Reply #56 on:** November 24, 2013, 10:00:52 pm »

50mm you better call Q for some port work then.
if bike does not have the hp to suck in air you will be slower with that big carb. and you will never get it jetted right.

Nopick · « **Reply #57 on:** November 25, 2013, 06:48:18 am »

GrkGuy recommending someone call Q for work. Something is seriously wrong with the world.

Buckeye513 · « **Reply #58 on:** November 25, 2013, 07:09:43 am »

Grk Q could offer to do the work for free and I wouldn't send him my stuff.

Nopick · « **Reply #59 on:** November 25, 2013, 08:42:46 am »

That is harsh.

Glamisrider · « **Reply #60 on:** November 25, 2013, 10:03:42 am »

Grk is right on the porting, a 50mm could be used but it will only work properly on a drag ported motor especially with a lectron.

I would recommend another builder for porting but we all know how that goes.

One last point, though everyone is limited by their budget, a motor is an air pump system and you can not just buy one piece have the rest mis-matched and expect highest performance. So buying a 50mm lectron and slapping it on a stock port motor, with a Q V-1, some v-2's and a large filter won't get you the highest performance on the drag strip or on the trails and ou'll be pissed b/c you spent good money and you're performance went down on both ends.

If you want a drag only motor have JH port the crap out of it and run a 50mm lectron. If you want to drag & trail/dune then get a aggressive dune/drag port and get a Vm44, or a HV44 lectron (they'll cost you about the same to get and set up in the long run).

You have to start with the end in mind otherwise you'll be chasing your tail all over the place continuing to spend $$$ until your happy.

You seem to be like the rest of us not happy until you've got the max performance possible for what you want to do so figure out what you want gather the parts.

LT500Kid · « **Reply #61 on:** November 25, 2013, 10:38:15 am »

I was told once that a lectron 48 is equivalent to a 46mm on other carbs. Is that a true statement?

GrkGuy · « **Reply #62 on:** November 25, 2013, 10:47:36 am »

i only said Q to be funny, haha lol get it. he is the only one that can build a motor like that in his eyes.
guess it went over a few heads. lol
if you wanna go fast call jerry hall..............................................
and matt i have heard the too.

Dezsled · « **Reply #63 on:** November 25, 2013, 11:20:42 am »

He put out a couple new vids?

LT500Kid · « **Reply #64 on:** November 25, 2013, 11:25:13 am »

I think cr told me that up at silver lk

Nopick · « **Reply #65 on:** November 25, 2013, 11:34:09 am »

Quote from: GrkGuy on November 25, 2013, 10:47:36 am

i only said Q to be funny, haha lol get it. he is the only one that can build a motor like that in his eyes.
guess it went over a few heads. lol
if you wanna go fast call jerry hall..............................................
and matt i have heard the too.

I don't think it went over anyone's head.

Gillio · « **Reply #66 on:** November 25, 2013, 11:39:02 am »

Who's Q??

Glamisrider · « **Reply #67 on:** November 25, 2013, 11:44:50 am »

Quote from: LT500Kid on November 25, 2013, 10:38:15 am

I was told once that a lectron 48 is equivalent to a 46mm on other carbs. Is that a true statement?

Yes and no, a HV, (high velocity) has a 2mm reduction in the center to increase the pulse. Lectron makes a regular straight and a HV, the regular has no reduction.

Quote from: GrkGuy on November 25, 2013, 10:47:36 am

i only said Q to be funny, haha lol get it. he is the only one that can build a motor like that in his eyes.
guess it went over a few heads. lol

Had me worried there Grk, I thought aliens must have abducted you

Motoman991 · « **Reply #68 on:** November 25, 2013, 12:22:46 pm »

Q? LOL. A legend in his own mind.

Yoyodyne1 · « **Reply #69 on:** November 25, 2013, 02:12:55 pm »

The zilla loves to breath! Long ago Arlen at LRD told me that in his dyno testing the vm44 mikuni put out 3hp more on the topend on a stock nonported fmf equipped zilla over a Keihin pwk39 with no hp loss on the bottom. I'm sure with even more mods the difference becomes even greater, plus I love the look of the old school roundslide...gives more of the sleeper effect to the squids at the hill.

Nopick · « **Reply #70 on:** November 25, 2013, 02:34:36 pm »

"Loves to breathe." "Likes big pipes and filters."

I think every builder I have talked to has said similar things.

Dezsled · « **Reply #71 on:** November 25, 2013, 06:09:20 pm »

Sorry I'm late to the swap... Does this carb bolt on to oem Zilla intake/airbox boots?

Got the black throttle tube for the gunnar gasser

Zilla273 · « **Reply #72 on:** November 25, 2013, 07:29:12 pm »

Dezled, ive heard u have to heat and stretch both the intake and filter tube to fit the vm,

Yoyodyne1 · « **Reply #73 on:** November 25, 2013, 10:09:47 pm »

Here is a comparison photo of a stock VM44 and one I had machined down. On the intake side of the carb I also had it shortened so the carb wasn't so long and both OD turned down, this makes life easier getting it in and out of the stock boots. Still requires some stretching of the boots, but not nearly as much without the machining.

Nopick · « **Reply #74 on:** November 26, 2013, 06:56:26 am »

I have also read that turning down the OD of the carb flanges helps on some of the big carbs.

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Author Topic: 38 vs 42.5 mm (Read 2878 times)

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