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Author Topic: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke  (Read 10228 times)

Offline advCo

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I started out today with spark, not great but definitely there. Cut the end off the plug wire and got a new bite with the cap and ended up with a nice fat blue spark. The exhaust was caked up with carbon and misc junk from being stored, so I ended up hacking off the tip of the muffler to clean it out. I'll run it like that temporarily until the welder is set up.

The carb was cleaned and reinstalled, even though it hardly needed it. The needle is set to the middle.



The petcock was a little sticky but a squirt of WD  and it freed right up. I've got fuel to the cylinder, after cranking it a few times the plug is wet, but it's not sounding like it wants to start. I kick it over, but it's not firing. Somewhere between then and now I lost spark, so one of the dang ignition switches must have shorted out. Another project for another day.

I was originally thinking the timing was off, but in order to change it I need to pull the flywheel, with a tool that I don't have. Could also be something stuck in the reed valve, or the crankshaft oil seal if it's real bad. Not sure where to look next.




Sent from my iPhone using DO THE TON
"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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Got sick of looking at this thing on the bench so I decided to get into it. About 20 minutes later we had this:

Trans case clean, as expected. The kicker shaft is indeed bent about 1/8" out at the very end. I chucked it up in the drill press to get an eyeball on it.

Cylinder and piston all good. Rings moving freely. Inside of the case looks clean as a whistle.


When I pulled the carb for tear down, the bowl was empty. Since compression above the piston was 90psi, I'm leaning towards a leak in the crankcase. I'm thinking it's one of these few things causing the problem: the 2 crank seals, the reed valve sealing to the top of case, or where the carburetor bolts onto the intake.


Sent from my iPhone using DO THE TON
"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 JustinLonghorn

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #12 on: Sep 01, 2016, 10:41:02 »
In for the No-ped.
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline DesmoBro

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #13 on: Sep 01, 2016, 18:12:52 »
You gonna go full out crank up rebuild with a kit and bigg carb and pipe? ......PppppppPlease...........do more reasearch ! What if a motobecane race crank fits right in ? What then?
"I desire the things that will destroy me in the end"

Offline JustinLonghorn

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #14 on: Sep 01, 2016, 18:53:28 »
What if a motobecane race crank fits right in ? What then?

What then indeed!
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline advCo

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Oh damn. Turbo scooter!!!

I'm trying to get to the crank seal over here, but this centrifugal clutch thingamjig is in my way. Manual says I need a clutch holder tool, but it's discontinued everywhere and I can't even find a good picture to make one. Any ideas?






Sent from my iPhone using DO THE TON
"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 DesmoBro

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #16 on: Sep 02, 2016, 00:55:44 »
Search Moped Army repair section ****hint *****search all dates not just last month...but i think motion pro has one that could work
There may also be stuff in the moped wiki
There is also a tuning spreadsheet so you can see what kit pipe jet speed etc....others used & got
And if you search in the performance section youll see all sorts of tricks
« Last Edit: Sep 02, 2016, 01:07:16 by DesmoBro »
"I desire the things that will destroy me in the end"

Offline stroker crazy

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #17 on: Sep 02, 2016, 01:12:10 »
There is also a tuning spreadsheet so you can see what kit pipe jet speed etc....others used & got
And if you search in the performance section you'll see all sorts of tricks

This may be gathering momentum!

Crazy
“Ride like the Wind” W.H.

Offline advCo

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Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #18 on: Sep 02, 2016, 02:10:48 »
Search Moped Army repair section ****hint *****search all dates not just last month...but i think motion pro has one that could work
There may also be stuff in the moped wiki
There is also a tuning spreadsheet so you can see what kit pipe jet speed etc....others used & got
And if you search in the performance section youll see all sorts of tricks

I actually have read through there. The formatting on that forum makes it a pain in the ass to read though. I guess a popular mod on the FA50 is to shave the mating surface of the head, I think you can take about 1mm off to make the fins sit even with the cylinder. I'm not set up for it, all I have is a belt sander


Sent from my iPhone using DO THE TON
« Last Edit: Sep 02, 2016, 02:18:30 by adventurco »
"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 Nj732port

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #19 on: Sep 02, 2016, 08:17:11 »
I actually have read through there. The formatting on that forum makes it a pain in the ass to read though. I guess a popular mod on the FA50 is to shave the mating surface of the head, I think you can take about 1mm off to make the fins sit even with the cylinder. I'm not set up for it, all I have is a belt sander


Sent from my iPhone using DO THE TON

more has been done with less 8)

inspiration?