Re: purple pain, full rigid maxi build

fuck yes

Re: purple pain, full rigid maxi build

Love to see it working out ..

Re: purple pain, full rigid maxi build

ᴛᴇʀʀʏ ᴅᴇᴀɴ /
dean OP

the starting clutch was my last hangup, so I said fuck it and made something work.

it's not ideal, and I'm gonna work out a better solution at some point, but it'll do for now

it required putting another hole in the frame, but this frame is so hacked up already, I'm ok with it

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Re: purple pain, full rigid maxi build

ᴛᴇʀʀʏ ᴅᴇᴀɴ /
dean OP
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I would have preferred the lever to be on the non throttle side, but the kill switch is over there. it works well enough where it's at and isn't super awkward to use, so it gets the "good enough" stamp (edited)

Re: purple pain, full rigid maxi build

Tight. I can't wait to hear it run.

Re: purple pain, full rigid maxi build

ᴛᴇʀʀʏ ᴅᴇᴀɴ /
dean OP

first start was super lean, shut it down. one of the carbs wasn't getting gas. took out the little banjo bolt screens from both carbs and that did the trick.

here's 2nd start, but first time running

and a couple more

Re: purple pain, full rigid maxi build

ᴛᴇʀʀʏ ᴅᴇᴀɴ /
dean OP

I can't go ride it right now to see about tuning and whatnot, but soon!

Re: purple pain, full rigid maxi build

Nice! Sounds mean. purple pain is gonna haul ass.

Re: purple pain, full rigid maxi build

Snordley has a problem on his twins going from one petcock to a splinter where one carb would drain and the fuel flow would favor one carb over the other. You may have to make a twin line petcock or maybe some sort of auxiliary tank with two outlets for it to function properly. (edited)

Re: purple pain, full rigid maxi build

ᴛᴇʀʀʏ ᴅᴇᴀɴ /
dean OP

yeah, we'll see. so far it seems happy. these are little 14mm bings, so they don't demand a lot of fuel really. the lines are pretty even too, rather than having one carb fed before the other.

but now i gotta get a new throttle tube cos two bing springs was just too much for this wps tube

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Re: purple pain, full rigid maxi build

Just read this.....amazing work, color me impressed, LOVE the lamp pull chain! I would never have thought of any of this, so cool to see it being made. Keep the thread going, want video of you riding this thing when it's done!

Re: purple pain, full rigid maxi build

🇮🇹💦 Of the Loin /

One petcock won't ever supply fuel equally all the time, it's fluid Dynamics.

Same reason I think Harley is fucking stupid for putting 1 carb on a v-twin. Physics says the rear cylinder will require different jetting than the front. You need two carbs.

Re: purple pain, full rigid maxi build

Dirty30 Dillon /

> Maitlanf Of the Loin Wrote:

> -------------------------------------------------------

> Same reason I think Harley is fucking stupid for putting 1 carb on a

> v-twin. Physics says the rear cylinder will require different jetting

> than the front. You need two carbs.

I mean, that second cylinder only supplies a small fraction of the power, so it's probably not coincidence they were like "meh"

Re: purple pain, full rigid maxi build

🇮🇹💦 Of the Loin /

Umm what

That doesn't make any sense

Re: purple pain, full rigid maxi build

> Maitlanf Of the Loin Wrote:

> -------------------------------------------------------

> One petcock won't ever supply fuel equally all the time, it's fluid

> Dynamics.

>

> Same reason I think Harley is fucking stupid for putting 1 carb on a

> v-twin. Physics says the rear cylinder will require different jetting

> than the front. You need two carbs.

A split right off the tank bung would be best methinks. At least that way you're evenly splitting the reduced flow. I would imagine with 12mm carbs flow reduction wouldn't be a huge concern.

Re: purple pain, full rigid maxi build

Dirty30 Dillon /

> Maitlanf Of the Loin Wrote:

> -------------------------------------------------------

> Umm what

>

> That doesn't make any sense

Because the second cylinder fires when the first is still in it's power stroke. It's efficacy in adding power is limited to the back end of it's stroke. This is the reason why the newer A/C HD's can have rear cylinder cutouts and it's no problemo.

Re: purple pain, full rigid maxi build

no groms no blasters /

read the book sweaty

(edited)

Re: purple pain, full rigid maxi build

🇮🇹💦 Of the Loin /

That's not how Big Bang firing order works at all

> Dirty30 Dillon Wrote:

> -------------------------------------------------------

> > Maitlanf Of the Loin Wrote:

>

> > -------------------------------------------------------

>

> > Umm what

>

> >

>

> > That doesn't make any sense

>

> Because the second cylinder fires when the first is still in it's power

> stroke. It's efficacy in adding power is limited to the back end of it's

> stroke. This is the reason why the newer A/C HD's can have rear cylinder

> cutouts and it's no problemo.

Re: purple pain, full rigid maxi build

ᴛᴇʀʀʏ ᴅᴇᴀɴ /
dean OP

keep in mind this is one cylinder with two 14mm bings that work out to be around the equivalent of a single ~20mm carb.

my other maxi, as we as many other maxis out in the world, have no problem feeding 21mm and 24mm carbs on gila kits.

we're also at 7200 feet, everyone runs tiny jets up here. tho I don't think it would be a problem jetting for sea level or lower.

Re: purple pain, full rigid maxi build

> terry dean Wrote:

> -------------------------------------------------------

> keep in mind this is one cylinder with two 14mm bings that work out to

> be around the equivalent of a single ~20mm carb.

>

> my other maxi, as we as many other maxis out in the world, have no

> problem feeding 21mm and 24mm carbs on gila kits.

>

> we're also at 7200 feet, everyone runs tiny jets up here. tho I don't

> think it would be a problem jetting for sea level or lower.

Can I ask what you used to calculate the combined size? I'm planning two 12mm for my Sachs Airsal but maybe I should go 14mm? That being said your kit is WAY more powerful than the airsal.

Re: purple pain, full rigid maxi build

ᴛᴇʀʀʏ ᴅᴇᴀɴ /
dean OP

it's just the area of circles, really. a 14mm circle has the area of 615.8mm, 1231.6mm when there's two of them. a 20mm circle has the area of 1256.6mm, so this is more like the equivalent of a 19.8mm carb, but it's close enough to call it 20mm

Re: purple pain, full rigid maxi build

> terry dean Wrote:

> -------------------------------------------------------

> it's just the area of circles, really. a 14mm circle has the area of

> 615.8mm, 1231.6mm when there's two of them. a 20mm circle has the area

> of 1256.6mm, so this is more like the equivalent of a 19.8mm carb, but

> it's close enough to call it 20mm

Okay so my two 12mm are around the size of a 17mm carb. Should be pretty good for this kit actually.

Re: purple pain, full rigid maxi build

> terry dean Wrote:

> -------------------------------------------------------

> it's just the area of circles, really. a 14mm circle has the area of

> 615.8mm, 1231.6mm when there's two of them. a 20mm circle has the area

> of 1256.6mm, so this is more like the equivalent of a 19.8mm carb, but

> it's close enough to call it 20mm

Also it seems you had your formula off a bit for calculation. Looks like you calculated using diameter squared instead of the radius squared.

Shouldn't matter as long as you used that calculation for everything.

Re: purple pain, full rigid maxi build

Dirty30 Dillon /

> Maitlanf Of the Loin Wrote:

> -------------------------------------------------------

> That's not how Big Bang firing order works at all

Sure, shows what I know.

Re: purple pain, full rigid maxi build

ᴛᴇʀʀʏ ᴅᴇᴀɴ /
dean OP

originally I did the math myself using 3.1416 x r², but for the sake of not doing math in the last post I used this online calculator https://www.calcunation.com/calculator/circle-area.php

they say it uses pi x r², but I'm way to lazy to check their maths rn. like you said tho, as long as you use the same forumula everything, it won't matter

Re: purple pain, full rigid maxi build

todd amundson /

I wanted to say the calculations bit is tricky at best. Two 12’s do get you about 18.2. I’m tuning a 14.2 and a 15.15 SHA combo at the moment. I really made sure this shit worked before mounting it to the bike. I’m not using bings and I’m not pounding a single intake either. Different slides, pull timing, jets, choke plates. Completely different parameters but I feel for you.

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Re: purple pain, full rigid maxi build

Stock class rules don’t say that you can’t have 2 15mm carbs

Re: purple pain, full rigid maxi build

todd amundson /

Stock class

Waste of gas

Re: purple pain, full rigid maxi build

So it’s a pr case with a pp cylinder? How fun!

Re: purple pain, full rigid maxi build

ᴛᴇʀʀʏ ᴅᴇᴀɴ /
dean OP

I ordered an all aluminum quick pull throttle from amazon to replace the broken wps throttle and it'll be here in a few days. I was thinking about doing a push/pull throttle and rigging up some kind of spring pull assist on the push side, but it's not really that hard to pull the two bings, the plastic just couldn't handle it.

bummer part is I couldn't get it in black or silver unless I wanted to wait for like a month for it to arrive. just red, green, or blue. I got red and it's gonna be super ugly, I may strip the anodizing off.

but whatever, no more broken throttles

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