Fab Flash 7: Fabrizi 50mm Cylinder Kit (74.6MPH)

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Wheelman-111
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Fab Flash 7: Fabrizi 50mm Cylinder Kit (74.6MPH)

Post by Wheelman-111 »

Greetings:

Solid Forumista vendor supplied this kit at a fair price. Fabrizi enjoys a good reputation. Looking forward to installing on the 2001 block and seeing how she runs.
F7FabriziKit.jpg
F7FabriziKit.jpg (181.15 KiB) Viewed 10741 times
The split exhaust port is a yard wide, nicely chamfered and smooth.
F7FabExhPort.jpg
F7FabExhPort.jpg (97.6 KiB) Viewed 10741 times
My current pipe choices are PG Short and Scorpion for 72cc.
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
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Re: Flash 7 Cylinder Kit

Post by Trafficjamz »

:mrgreen: :mrgreen: jelly
new best 1/8th mile time 9.647 seconds @67.155 mph 310lbs total weight
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Re: Flash 7 Cylinder Kit

Post by Downsouthdio »

Scorp for the win!!
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Re: Flash 7 Cylinder Kit

Post by ped »

Very nice. let us know how it performs. :thumbwink:
Life's a trip enjoy the ride.
94 elite SR, 86 spreedio, polini corsa, keli variator, 8.4, jet. speed 65 mph
spreedio video. https://www.youtube.com/watch?v=BZr46_-douQ
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Re: Flash 7 Cylinder Kit: CONTACT!

Post by Wheelman-111 »

Greetings:

The teardown of the MHR revealed an AMAZING condition for bore and piston. I've never seen a piston and bore look this good - even the Corsa had fine lines, but the Malossi? - Nothin'.
F6MalossiPiston.jpg
F6MalossiPiston.jpg (204.26 KiB) Viewed 10686 times
The cylinder likewise was unscathed:
F6MalossiBore.jpg
F6MalossiBore.jpg (119.01 KiB) Viewed 10686 times
The differences between the cylinders were considerable.
F6F7Cyls.jpg
F6F7Cyls.jpg (146.26 KiB) Viewed 10686 times
Note only 6 cooling fins on the Fabrizi compared to 7 on the Malossi. The thing that worries me a little is the wall thickness of the Fabrizi (F7) cylinder; not much "meat" there:
F6F7BoreWallThkness.jpg
F6F7BoreWallThkness.jpg (107.03 KiB) Viewed 10686 times
So it was time to grease some gaskets and slather some Motul and bolt 'er up: UH-OH!
F7PistonBottom.jpg
F7PistonBottom.jpg (130.29 KiB) Viewed 10686 times
That's as low as the piston could go. It stops at least 20 degrees from BDC. I didn't notice it with the cylinder off, because the piston was then free to rock a little as it went through the bottom of the stroke, but it's not even close bolted up. It makes contact with the case:
F7CaseContactANOT.jpg
F7CaseContactANOT.jpg (193.61 KiB) Viewed 10686 times
I'm not sure if the reason is that the Fab's designed for Kymco or another similar-but-not-identical case, or if the Malossi crank rod is that much shorter than stock. Whatever the reason, I think I have a solution: I plan to shave the "corners" of the piston as marked here on Wheelman's Workbench:
F7FabPstnCrnr.jpg
F7FabPstnCrnr.jpg (212.63 KiB) Viewed 10686 times
If anyone has a better idea that DOESN'T involve splitting the case and working that instead, please let me know. OK you can tell me if that's the ONLY effective solution too, but be gentle. I'm taking a break for a few hours. Hopefully someone who's assembled one of these can advise. Red Eft? More on this as it develops.
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
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Re: Flash 7 Cylinder Kit: CONTACT!

Post by LMH »

The malossi crank rod is the same as stock.
The bore is made for a 44.6 stroker crank if I remember right.
How does it sit at tdc?
If you're shaving your piston make sure to do equal amount on each side.
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Re: Flash 7 Cylinder Kit: CONTACT!

Post by Red Eft Performance »

Thats an odd place hit. I was told from Fabrizi that this was for stock stroke.

I dont think this cylinder is for a larger stroke crank. If the stroke was any longer the crank would have to have a longer conrod or the piston would hit even more. If it had a longer conrod the it seems the piston would never clear the exhaust port.

regardless of the stroke of the crank the bottom of the piston hits before it clears the exhaust port.

I will see what additional info I can find out.

Like Graphite and lovemyhonda said already I dont see a problem cutting the piston.
When you are done cutting the piston be sure to put a chamfer on the new cut to prevent the piston from scraping oil off the cylinder wall.
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Re: Flash 7 Cylinder Kit: CONTACT!

Post by LMH »

Longer con rod = more distance between piston pin and bdc which makes the piston not hit the case. Then you add base gaskets to the jug to level out exhaust timing as long as tdc is within spec to the head.
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Re: Flash 7 Cylinder Kit: CONTACT!

Post by Wheelman-111 »

Greetings:

Apparently this is the first Fabrizi build report here. TDC LOOKED Normal enough that I didn't measure. I'll take another pic when I go out there.

Thanks for the input so far, but if anyone has assembled a Fab, please let me know. Clearly this isn't bolt-on for my block and Malossi crank at least.
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
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Re: Flash 7 Cylinder Kit: CONTACT!

Post by paulpauly7 »

i read on another forum that the kit is made for a 44ish mm stroke crank .when installed on a stock stroke a 3 -4 mm base gasket is needed to correct port timing .like i said i juat read this else where no personal experience with this kit .you could buy a stroker crank
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Re: Flash 7 Cylinder Kit: CONTACT!

Post by Wheelman-111 »

Greetings:

After shaving equally on both sides of the piston, she spins around like Buttah. Thanks for all the input Dawgs. I just wondered if Signore Fabrizi simply plucked the wrong piston from the bin, but it measures so perfect with the bore all is forgiven. Trusty Dremel and carbide cutter made this literally a 10-minute shave operation. Smoothed out with stone and diamond files and she look gooood!
F7PstnChmfr.jpg
F7PstnChmfr.jpg (140.93 KiB) Viewed 10640 times
Yes, carefully chamfered the cutouts... Thanks again for this important reminder.

This Fab cylinder definitely isn't for mini-stroker. At bottom dead center, the transfer ports are just barely fully-exposed:
F7Transfer.jpg
F7Transfer.jpg (109.1 KiB) Viewed 10640 times
Meanwhile, the piston crown drops just visible through the giant exhaust port.
F7PistonBottom.jpg
F7PistonBottom.jpg (130.29 KiB) Viewed 10640 times
You can see where it resides with respect to the exhaust port in the previous pic too. At Top Dead Center, you can see this isn't meant for a stroker; stock gasket at the base is regular thickness.
F7TDC.jpg
F7TDC.jpg (161.77 KiB) Viewed 10640 times
Compression test and Ignition must wait for the morrow. I forgot what jets are in the OKO 28, 55 and 155 or so (I think...) How much bigger to install? The plug on the pristine Malossi was dark chocolate...
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
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Re: Flash 7 Cylinder Kit: CONTACT!

Post by ped »

Very interesting :shock:. very good photos and info wheelman. thanks for posting.
when I order my fabrizi kit I know I will have to cut and taper the piston skirts.
Life's a trip enjoy the ride.
94 elite SR, 86 spreedio, polini corsa, keli variator, 8.4, jet. speed 65 mph
spreedio video. https://www.youtube.com/watch?v=BZr46_-douQ
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Re: Flash 7 Cylinder Kit: CONTACT!

Post by Wheelman-111 »

Greetings:

I am interested in seeing what it does with a stock crank or a different block. Someone said the Malossi rod is the same as stock. Seeing how much interference the piston had in my block, I am not so sure. It seems like a boneheaded oversight for such a well-engineered kit otherwise.
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
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Re: Flash 7 Cylinder Kit: CONTACT!

Post by LMH »

Malossi crank is indeed stock stroke, stock big end diameter, and stock con rod length. Only change is a stuffer to decrease the amount of volume in the case to speed up air flow and scavenge. Other wise it would be a stroker. Any modification to either would change the port timing on any cylinder.
It's really hard to tell how tdc that piston is in the pic but once you check squish you will know for sure. If you get it together and you have issues with high rpm you may want to bevel the piston crown.
You know maddog has installed a fabrizi or so he claims.
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Re: Flash 7 Cylinder Kit: CONTACT!

Post by ped »

+1 on boneheaded oversight. please keep us posted on any thoughts. how wide was that piston? :confused:
Life's a trip enjoy the ride.
94 elite SR, 86 spreedio, polini corsa, keli variator, 8.4, jet. speed 65 mph
spreedio video. https://www.youtube.com/watch?v=BZr46_-douQ
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