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@jeredjp avatar
UTC

Enthusiast
'74 Rally 200, '05 PX150, '58 VBA
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Location: Milwaukee, WI
 
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@jeredjp avatar
'74 Rally 200, '05 PX150, '58 VBA
Joined: UTC
Posts: 50
Location: Milwaukee, WI
UTC quote
I purchased SIP p/n 50004600 (Rally 200 femsa vespatronic kit). After installation the woodruff key gave way and completely knackered the crank and flywheel. The rest of the system is fine and I've got a new crank on the shelf. I reached out to my parts supplier and SIP directly looking for just the flywheel for this kit and it turns out it isn't offered my itself. It was suggested that I look at Ebay Italy, but that isn't proving to be fruitful. Does anyone have any ideas or leads? Crying or Very sad emoticon
@birdsnest avatar
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VNB VSC VMA VSX - o9c vbc vmb
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@birdsnest avatar
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UTC quote
EEK. That's a bitter pill. Sorry... no help but hope you find a solution. If you don't run down just a vespatronic flywheel and have to buy another complete kit, I think Pinasco makes a femsa compatible EI that will save you maybe 75.00 bucks?

Good luck
@mjrally avatar
UTC

Veni, Vidi, Posti
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 59 Ser 2, 65 Silver Special, 90 V5N 50, 2015 HD Road Glide Special
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Veni, Vidi, Posti
@mjrally avatar
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 59 Ser 2, 65 Silver Special, 90 V5N 50, 2015 HD Road Glide Special
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UTC quote
The only other electronic ignition option Ive found for the Femsa cranks is the Pinasco flytech. I don't think that would work for you as the pickup is different than the Vespatronics and I don't think they sell just the flywheel.

If you haven't already rebuilt things, I'd say swap the femsa crank for a p200 crank. Just need a different flyside bearing and seal. It opens you up to a lot more aftermarket ignitions.

I love my Femsa Rallys and the quirks that come with them, but when the Flytech craps out on mine, I'll swap for Vape.
@oopsclunkthud avatar
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@oopsclunkthud avatar
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UTC quote
In what way is the flywheel messed up? just the taper and keyway?

If so you may be able to clean it up and lap it to fit.

note: I'm running the vespatronic on my Rally and had to do a few modifications to the stator to get things to fit, but I think that was unique to the one i got.
OP
@jeredjp avatar
UTC

Enthusiast
'74 Rally 200, '05 PX150, '58 VBA
Joined: UTC
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Location: Milwaukee, WI
 
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@jeredjp avatar
'74 Rally 200, '05 PX150, '58 VBA
Joined: UTC
Posts: 50
Location: Milwaukee, WI
UTC quote
oopsclunkthud wrote:
In what way is the flywheel messed up? just the taper and keyway?

If so you may be able to clean it up and lap it to fit.
The taper and keyway are completely shot, beyond repair.
@garncarz avatar
UTC

Molto Verboso
1964 Allstate Cruisaire, 2022 Husqvarna Vitpilen 401, 1972 Suzuki T500J
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@garncarz avatar
1964 Allstate Cruisaire, 2022 Husqvarna Vitpilen 401, 1972 Suzuki T500J
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UTC quote
The woodruff key is just a guide to keep everything lined up. Ie, soft and almost sort of sacrificial. If you have a good taper, you don't really need a key to hold things together. Can we see pictures of the shaft taper and the inside of the flywheel? Maybe its not that bad?
OP
@jeredjp avatar
UTC

Enthusiast
'74 Rally 200, '05 PX150, '58 VBA
Joined: UTC
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Location: Milwaukee, WI
 
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@jeredjp avatar
'74 Rally 200, '05 PX150, '58 VBA
Joined: UTC
Posts: 50
Location: Milwaukee, WI
UTC quote
I'd say the little guy is pretty "fornicated"
Forum member supplied image with no explanatory text
@subetherbass avatar
UTC

Ossessionato
1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
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Location: Australa, Mate
 
Ossessionato
@subetherbass avatar
1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
Joined: UTC
Posts: 4814
Location: Australa, Mate
UTC quote
I only have 1 thing to say...

Well actually, others have already said it...
What Have You JB Welded?
@spacecat avatar
UTC

Hooked
Vespa Primavera 1974
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Location: Nebraska USA
 
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@spacecat avatar
Vespa Primavera 1974
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Location: Nebraska USA
UTC quote
SubEtherBASS wrote:
I only have 1 thing to say...

Well actually, others have already said it...
What Have You JB Welded?
this was inspirational
@subetherbass avatar
UTC

Ossessionato
1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
Joined: UTC
Posts: 4814
Location: Australa, Mate
 
Ossessionato
@subetherbass avatar
1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
Joined: UTC
Posts: 4814
Location: Australa, Mate
UTC quote
spacecat wrote:
this was inspirational
See, nowhere near knackered!

There's plenty more gems of knowledge where that came from!
@v_oodoo avatar
UTC

Style Maven
'74 50s x3 '87 PK125XL '92 PK50XLS Plurimatic - & - '58 AllState '68 Sprint '66(?) Super125 and '72 DanMotor Super150
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Style Maven
@v_oodoo avatar
'74 50s x3 '87 PK125XL '92 PK50XLS Plurimatic - & - '58 AllState '68 Sprint '66(?) Super125 and '72 DanMotor Super150
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UTC quote
I bet you didn't torque down the flywheel nut tight enough before you tried it out? Ask me how I know, and more than once Facepalm emoticon . As said, that small key is NOT to carry the load, the tight precise taper is designed to do that. Emphasis on tight. Making things worse is that it's an oscillating rotational load, your flywheel is 'pushing' for half of the stroke, and 'pulling' the other half and you can see that when the flywheel slipped, it hammered that poor key from both sides.
SubEtherBASS wrote:
See, nowhere near knackered!
...
Unless there's more damage we can't see, I'd have to agree. Looks like you likely still have 95+% of your taper surface in decent shape, I was afraid it would be all galled.

A half hour w/ a Dremel in there to remove the high spots, then onto a crankshaft to be lapped in. First coarse compound, then fine. Then small Swiss pattern files to clean up the keyway and a brand new snug key, then check to see if it catches the keyway. If it does, you're in business w/ your new crank.

So let's see your old crank.
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