Forum - Briggs & Stratton Racing
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topshelf

Registered: 12/24/13
Posts: 4
Reply with quote  #1 
I just put a new lo 206 in my sons mini z 120 the motor runs good till half throttle then the motor Start's cutting out
BriggsRacing1

Registered: 06/22/11
Posts: 188
Reply with quote  #2 
Topshelf,
             I'm hoping you have figured it out but there has to be something pretty simple going on (which can be the most frustrating).  Do you have a tach to know for sure that the rev limiter isn't just cutting the ignition?  If the cutting out is uniform in sound it could just be you need to change your gearing to enjoy the additional power.  Is there an RPM where this is happening?  The reason I ask is you might have dirt in your main jet which would prevent enough fuel from allowing the engine to rev consistently.  If it runs well with the choke on wide open, you know it isn't hitting the rev limiter, and it breaks up when the choke and full throttle is applied you might just need to clean the jets.  I would suggest a fuel filter anyways.  Between the dirt in your gas can and what is likely in your tank already this eventually gets to your engine.  

Lastly, have you set the carburetor float?  In transit and the like your float level, which controls the fuel level in your bowl, might be creating a rich condition.  If it's too rich this could cause the engine to break up as well.

I think this gives you at least a starting point.  If you have any other questions please fire away.  If you have figured it out please write back.  The same problem someone else will experience at some point and maybe your post can help resolve it for others.


topshelf

Registered: 12/24/13
Posts: 4
Reply with quote  #3 
Simply problem it was hitting the rev limiter a bigger gear fixed it
BriggsRacing1

Registered: 06/22/11
Posts: 188
Reply with quote  #4 
Topshelf,
            THANK YOU for following up.  The rev limiter 'feels' like it could be an engine issue so we are glad you stopped by to ask the question and likely help others out.

Enjoy your engine and thank you for the support!
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