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running lean on a 1256


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#16 Bolens 1000 ONLINE  

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Posted May 03, 2017 - 06:35 PM

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#17 hiltu OFFLINE  

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Posted May 05, 2017 - 05:06 PM

So im pretty sure thats the numbers i got earlier, i rotated the crank until the valves dropped and used a feeler gauge to obtain them.



#18 Bolens 1000 ONLINE  

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Posted May 05, 2017 - 05:38 PM

I'm wondering if you dont have a faulty ignition system

 

Carb is good, valves are good , motor has new piston rings ect.



#19 hiltu OFFLINE  

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Posted May 05, 2017 - 08:29 PM

All ignition is new except the part on the front of the crank. I kept all old stuff, so i could go about changing things out.



#20 hiltu OFFLINE  

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Posted May 09, 2017 - 03:26 AM

Anything I should try to replace first? I am still pondering the carb. Up until i removed the needle valve from the main jet, nothing i did could get the motor to run rich. After reinserting it, I got unburnt fuel smoke and a dark spark plug. I was thinking the coil first?



#21 Bolens 1000 ONLINE  

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Posted May 09, 2017 - 07:52 AM

I think you can rule out the carb it did respond when I made adjustments on the main jet, its loose and turns from vibration at times but other than that I have found nothing wrong with it when I tested it for an hour.

 

I still think valves or ignition may be your issue , did the shop vap or reface the valves to make sure they are seating correctly?

Are you using fresh gas?



#22 framesteer OFFLINE  

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Posted May 09, 2017 - 07:47 PM

Could be that the gas tank cap is not venting properly.  If it isn't venting properly, the engine may run fine for a while (after removing and replacing the gas cap), then the tank will pull a slight vacuum and the fuel will stop flowing to the carb.  The engine will run lean and eventually die.


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