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Cub Cadet Challanger 700 engine issues

The Behemoth

By The Behemoth
in Cub Cadet UTV SxS Forum

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The Behemoth Newbie

The Behemoth

Posted
Posted

I am needing help on my UTV. I replaced the piston up with a kit that I bought for the it. I had trouble with the timing since it is so hard to see the flywheel. I have the service manual and have watch many videos on timing these things and I feel about 50% sure it is timed right. I have taken it apart several times to triple check to make sure the cam is set right and the mark is in the window. But it runs like trash and back fires. What am I missing? I am about at my wits end fighting this thing. I have attached a video from google drive so you can hear and see what is doing. Thanks for the help!  

Eric 
 

https://drive.google.com/file/d/1MxRbxufrrXkunbNcTgp7KOD5kJ_Ac4t2/view?usp=drivesdk

Ben1098 Enthusiast

Ben1098

Posted
Posted

I did a still frame of the little blue flash around 35/38 sec.......that is a problem......to get this, you have 2 problems going on.

1.  Intake valve leaking or open-----bent (timing wrong and dinged the piston) or no valve clearance.  Leak down test and listen for air whistle.

2.  Intake leak in the casting area after the carb intake air boot.  The lean air mixture "spit" will also cause the faster idle speed.

Recheck the ign timing with the copper wire "feeler depth gauge"  TDC piston location.  Check that the cam lobes are pointed down-----valves closed and not on overlap and then paint dot the cam index point at 12 o'clock......the dimple is under the metal tab covering the flyweights.  I posted a detailed instructions in an earlier post about the paint the cam trick.

Recheck the valve clearance.  Ensure you are not on the decompression pin for the exhaust valve adjustment.......rotate the flyweights to retract the decompression pin.

The BLUE FLASH.  Visual.  By the size of the blue flash it has to be easy to spot.  

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