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Author Topic: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke  (Read 10153 times)

Offline advCo

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After romping around the neighborhood on one of these the other day, we decided we wanted to snag one to tool around on. This came up about an hour away for $80, seemed like a decent deal so we hopped in the truck and scooped it up. It was put away by the PO after it got "hard to start," may need a set of rings but we'll see.



Not sure if the kicker is installed correctly, I think they're usually parallel to the ground and kick down to about 6:00, and it marred the hell out of the case and Suzuki logo.



The footpeg support plates are both broken, looks like they were both JB welded and only one made it. No big deal I'll just weld a chunk of scrap on the missing one and run a bead over the JB.



First things first, a cold compression test showed 90 PSI. Seems low, but I'm not sure. I couldn't find a value in the service manual, only the compression ratio which is 6.5:1. I'm sure I can find spec range somewhere.



Yanked out the little baby carb. Clean as a whistle. The float bowl gasket even came off in one piece. That never happens. Throttle cable was a bit sticky so I'll have to address that later. Pretty sure the PO drained all the fuel before putting it away, which is a damn good surprise. Even the jets were clean. Quick soak for peace of mind and then I'll slap it back together.





And a tiny little container to stick all the tiny carb parts in ;)



Tomorrow I'll see if we can get spark. It has a PEI ignition which I've never heard of but has got to be some type of electronic ignition dealio. It's got a magneto so I think I can just complete the circuit where the battery would be and it should get spark. To be continued!




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"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline advCo

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #1 on: Aug 16, 2016, 02:34:18 »
After a bit of searching it seems like 90 PSI is right on for these little scoots. So that's good news, I shouldn't have to pull the cylinder off. Standard piston kit with rings is only $20 shipped from japan, so I may pick one up later to stick in the shop just in case.

I'm unfamiliar with 2-strokes, but I know crankshaft oil seals can cause hard starting and general problems. Would a bad crank seal cause low compression in the cylinder or would that show itself some other way? I'm thinking it can't hurt to replace it, only cost about $7 on eBay.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline hillsy

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #2 on: Aug 16, 2016, 06:16:02 »
Bad crank seals won't affect compression, but they will make the bike run lean as it will suck air in through the worn seal instead of fuel / air through the carb.


On one of these engines the crank seals should be pretty easy to replace (as opposed to a triple), so if I was you......

Offline Nj732port

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #3 on: Aug 16, 2016, 10:43:16 »
that's a massive needle!

Offline Maritime

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #4 on: Aug 16, 2016, 11:20:48 »
Change the crank seal it will help a lot in the running and not exploding of the motor.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
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Offline advCo

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #5 on: Aug 16, 2016, 11:59:55 »
Only explosions I want should be inside the cylinder  ;D

Crank seal on the way. Worth buying one of those pullers or should I just use a screw?
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline Ryan Stecken

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #6 on: Aug 16, 2016, 12:38:51 »
IŽm in man.Thats epic.

Offline VonYinzer

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #7 on: Aug 16, 2016, 13:07:42 »
Posted this in the "Latest Purchase" thread, but I'll post here as well so I can follow along. I have two of these plus some in the garage. Let me know if you need parts...
Like a river that don't know where it's flowin'
I took a wrong turn and just kept goin'

Offline advCo

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #8 on: Aug 16, 2016, 14:09:15 »
Posted this in the "Latest Purchase" thread, but I'll post here as well so I can follow along. I have two of these plus some in the garage. Let me know if you need parts...

Sweet!...I'd not be opposed to a headlight and fenders, luggage rack, if you've got any extras. Once I get it moving, that is.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline VonYinzer

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #9 on: Aug 16, 2016, 14:19:32 »
Sweet!...I'd not be opposed to a headlight and fenders, luggage rack, if you've got any extras. Once I get it moving, that is.

Shoot me a PM with the stuff you're looking for and I'll do some digging in the garage.
Like a river that don't know where it's flowin'
I took a wrong turn and just kept goin'