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Author Topic: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke  (Read 18998 times)

Offline hillsy

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #50 on: Oct 12, 2016, 11:08:29 »
If the problem is worn rings, then a squirt of oil in the cylinder should raise the compression the same as it would with a 4 stroke.

Offline advCo

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If the problem is worn rings, then a squirt of oil in the cylinder should raise the compression the same as it would with a 4 stroke.

Doh. Here I am thinking a 2 stroke is a different animal altogether

I went back and dry tested compression. 60 psi, same as before. A few squirts of oil later, and there's no compression. I mean, none at all. Gauge flips up to about 60 psi with one kick over, but drops immediately down to zero.


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Offline teazer

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #52 on: Oct 13, 2016, 01:49:07 »
That sounds like a harbor freight tester.  Please tell me it's not and if it's not, then let's fix the compression.  The compression should be at least 100 even on a l,ow powered low compression motor or else it won't run.  Not 100% sure that 100psi is an actual limit to combustion but it must be in the ball park.  Old motors back in WW2 ran on 80 octane fuel with 6:1 compression which is still 90psi. 

But before you go tearing it down, try the spark plug tester just so you know if it has enough spark to fire. 

Offline advCo

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Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #53 on: Oct 13, 2016, 02:05:51 »
That sounds like a harbor freight tester.  Please tell me it's not and if it's not, then let's fix the compression.  The compression should be at least 100 even on a l,ow powered low compression motor or else it won't run.  Not 100% sure that 100psi is an actual limit to combustion but it must be in the ball park.  Old motors back in WW2 ran on 80 octane fuel with 6:1 compression which is still 90psi. 

But before you go tearing it down, try the spark plug tester just so you know if it has enough spark to fire.

It isn't a harbor freight tester. I can't remember the brand but it's from an auto parts store or the internet somewhere. I have had successful readings before after adding oil (increased compression) - on other motors. I can check it against another gauge but I won't be able to get ahold of it until next week sometime.

I have one of these spark testers somewhere in a box, I will dig it out tomorrow and give that a go. If I can't adjust the gap I'll run to the store and grab the right one.




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Offline Maritime

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #54 on: Oct 13, 2016, 09:20:17 »
This is acting really weird. if it were a 4 stroke I would think the came was out 180 or something but since it is a 2 stroke there has to be something simple that is just not set/installed right or missing.
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Offline Hurco550

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #55 on: Oct 13, 2016, 21:22:49 »
probably a valve stuck open or something like that ;)

possible that you broke a ring putting the barrel back on??
"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
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Offline teazer

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #56 on: Oct 13, 2016, 21:56:50 »
I got some like this from Autozone not too long ago.  There are a couple of similar designs at low cost.





Offline advCo

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I got some like this from Autozone not too long ago.  There are a couple of similar designs at low cost.

Grabbed one of these and tested today. Throwing a good blue spark well up to 7mm, probably past. So I think we can rule that out.

I'm about 99% sure neither of the rings are damaged, I've had the barrel off and on a few times. When I get a little extra cash I will grab a piston and ring set and hone the cylinder.

I need to set the timing with a light as well.


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Offline Hurco550

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Re: Suzuki FA50 Moped - "The Bumblebee," or, my first two stroke
« Reply #58 on: Oct 20, 2016, 20:15:50 »
is the spark plug in the center of the head. if so and you wanted to we could mess around with some squish stuff on the lathe. ;)
"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline Hurco550

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Also, this is rad....
"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet