AV10 flywheel nut

I'm nearing completion of my av10 moby setup and hit a snag. The Doppler crank I've got has a right hand thread on the flywheel side (right hand side). This poses a serious problem for me since the fancy recessed, square drive nut that comes on the av7 engine is left hand thread. Has anyone encountered and/or found a solution to this problem?

On a separate note, I did work out some ghetto ways to remove and disassemble the moby variator without the factory tools or a vise. Let me know if you'd like the gory details.

Cheers,

Mike

Re: AV10 flywheel nut

so you're still using the novi magneto?

thats an important detail..

Re: AV10 flywheel nut

Yeah, I should have specified. I'm using the all of the stock ignition bits from a '78 50V, whatever that may be.

I'd be open to putting on an aftermarket setup if that would solve my current problem. I didn't go that route from the get go because in my experience if the ignition system works, there isn't really any performance to be gained by putting in a pricey electronic system. Feel free to prove me wrong if you disagree.

Re: AV10 flywheel nut

Always down to hear about a variator cracking method.

Re: AV10 flywheel nut

I still don't have a great solution to the flywheel nut issue but here's how I removed and cracked my variator without fancy tools.

One fancy tool I have is the moby flywheel puller which you're pretty much screwed if you don't have. That pulls off the pressure plate with ease. The next challenge is removing two snap rings down inside the clutch. The first, an internal ring wasn't too bad to get out using a small flathead screwdriver (I don't have snap ring pliers). The second, an external ring that goes around the crankshaft is much harder but I found that the key to success is pulling up on the variator assembly to put pressure on the snap ring while prying on it with a flathead screwdriver again. Once this is out, the assembly comes off and the challenge is removing the fixed cheek check nut. Removing a nut normally wouldn't be tough but it's nearly impossible to hold on to this crap. The moby manual says to use some fancy moby tool for this but I don't have time for such silliness. Instead I put socket head cap screws through a piece of wood and clamped the assembly to that. The heads of the bolts engage on the slots in the clutch that the moby tool engages on. This worked great for holding everything and some vise grips are perfect for loosening the check nut. The cheek is slightly tougher to remove since its so tough to grab. The moby manual suggests using a special tool that looks like an oil filter wrench. Even if I had such a tool, I'm pretty skeptical that it would actually work. Instead I clamped some vise grips to the edge of the cheek, put a screwdriver against the top of the vise grips and hit that with a two pound sledge hammer. After a half a dozen hard whacks or so the cheek came right off. If you're confused, check out the attached pics.

1236145793_fixture.jpg

Re: AV10 flywheel nut

Check nut removal pic attached

1236145865_check_nut_removal.jpg

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Cheek removal pic attached

1236145931_cheek_removal.jpg

Re: AV10 flywheel nut

Pic of my moby attached

1236146032_my_moby.jpg

Re: AV10 flywheel nut

Oh yeah, another tool not to buy would be the stroke limiter. A better method of holding the crank is to remove the spark plug, rotate the crank to BDC, fill the cylinder with rope, and you're done. The rope is nice and soft so it won't hurt anything inside the engine and will let you torque the crank as much as you need.

Re: AV10 flywheel nut

Oh holy shit I recognise those bikes! I sold you that moby and the model 7 when I was in santa barbara!

Re: AV10 flywheel nut

I machined out a couple of those nuts for Jesse Stevenson a while back. He put one on his bike and still has a couple to sell. Shoot him an email.

mrlenguini@hotmail.com

Pic related, Its me and him.

1236256834_picture_062.jpg

Re: AV10 flywheel nut

By the way here's the blue print for it. If you want the .par file let me know.

1236283995_doppler_crank_nut.jpg

Re: AV10 flywheel nut

If Jessie doesn't have anymore I have the ones with the kick start gear on it. The cost around $25 and yes know that's a lot but it took a lot to get them to the states.

<quarterkick.com>

Re: AV10 flywheel nut

Ha! Good eye Tracy, those are your bikes alright. The 50V has been kitted with a full av10 setup including, polini 70cc cylinder, malossi head and case, doppler crank, 21mm phbg carb, leo vince exhaust, and malossi variator.

I'll shoot jesse an email and if all else fails I'd be game to buy one from Nick. $25 doesn't sound terrible. I work in aerospace and I've seen $15k nuts (each) before so I'm not shocked.

Thanks for the help duders.

Re: AV10 flywheel nut

what's the thread diameter and pitch on these right hand thread nuts?

Re: AV10 flywheel nut

we have the av10 kickstart nuts brand new at quarterick (not listed on the site yet though).

shoot an email through the website for details.

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I sent you an email. I plan on making myself some of these so I though someone might be able to save me a trip to Tacoma Screw to figure out the pitch and diameter. I am guessing it is 1mm and I know I can caliper the diameter -- just looking to save some time.

Re: AV10 flywheel nut

M11x1

Re: AV10 flywheel nut

bueno

Re: AV10 flywheel nut

Hey, If you want Ian in a week or so I'll be able to make more. Been asking $20 for a new one to cover material. And it will have a easy to remove hex head on it. Yea!

Re: AV10 flywheel nut

we'll see. thanks

Re: AV10 flywheel nut

I have the means to make one but am far too lazy, especially if people are already making them. Anyone actually have one in stock that I could buy asap?

Re: AV10 flywheel nut

so, as it turns out M11 x 1 is a pretty unusual size, who knew!? Jesse, can you email me or post a photo of you're nut? the $20 is shipped price?

Re: AV10 flywheel nut

So, upon further internet sleuthing I have found that M11 x 1 nuts are used on puch and tomos mag wheel axles. numbers 21 and 17 in the diagram.

Re: AV10 flywheel nut

I do remember having to go to an actual machine shop to get that tap because a m11 usually has a 1.25 thread pitch. At least it not left hand.

Re: AV10 flywheel nut

Jesse, what happened to the other two we already cut?

Re: AV10 flywheel nut

Re: AV10 flywheel nut

Oh, my Ronald. One is spoken for already and the other is my used one that may be up for grabs still. Don't have the lathe running yet so can't make more. Woe is me.

Re: AV10 flywheel nut

Look Jesse I'm tired of your nuts!

Thou art a weedy common-kissing idiot, and I do believe, induced by current circumstances, that thou art a villain, cunt!

Re: AV10 flywheel nut

You treacherous swine! How quick ones turns when I can't drive to your house and kick your ass.

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