Question re power loss on recent ride


New Member
Local time
10:27 AM
Aug 7, 2008
Sammamish, WA
I recently acquired a Dahon folder with Mitsubishi 42cc (?) motor, Dimension Edge friction drive. Motor has about 15- 20 hours on it. Was riding along and experienced power loss with half tank of fuel still remaining. I was mostly powering and occasionally pedaling. The motor would not restart so I pedaled on home, filled the tank up full and the bike started and ran fine. Does anyone know what would have caused the power loss, it just kind of bogged down to a halt, when it happened. I thought these two stroke motors just keep on running as long as they have fuel. I use a 50:1 fuel ratio which is recommended. Any thoughts or suggestions would be appreciated.
hi bert; it sounds like your gas cap isnt vented. if it happens again remove and replace gas cap. it has happened to me on a car. mitch
If more oil is better, than why settle for 28:1, I say kick it up a notch and go 16:1
I am pretty sure that 50:1 is recommended in the manual. I , MYSELF , would not deviate much from that. Are you using a good quality oil ? Try changing the plug ?
Here's my symptoms, what's the cure??

Here's a little more detail on my previously posted problem concerning my Mitsubishi 43cc two stroke. It is a relatively low time motor from previous owner, about 15 hours or so. Driving a Dimension Edge friction drive. Motor starts fine and seems to run smoothly, but after a short time bogs down almost to a stop when powering the bike. I'm not running it real hard, when I open the throttle, you can hear a 'whaaing' sound from the engine as if it is trying to get more gas, but doesn't produce power then just bogs down and quits. I'm using the recommended 50:1 ratio, two stroke oil, spark plug seems clean and right color, gas cap appears to be vented. Peddle on home and it starts right up again, just won't last for long under power. A mechanical mystery to me but not to one of you fabulous gearheads. Any other suggestions along with the previous ones will be appreciated. All I want to do is have some fun with my new toy!
Is air flow to cylinder/head fins and carby restricted ?

Can you post some pics. so we might be able to see if that might be the case ?
if the idle wavers up and down while idling (standing still) check your carb float and make sure your gas cap breather is working!

Only when driving (asking for power) check fuel filter,air filter and then for vacum leaks arround the heads ect.