Hey there welcome to the forum. Did you download the manual? It should walk you through step by step with pictures. Makes it easy to get it right.
Here are the key points to timing the engine.
1. Remove the covers on the flywheel side of the engine.
2. Turn the 17mm bolt counterclock wise till you line up the |T in the small hole
3. Make sure your piston is at TDC through the spark plug hole
4. Put cam in with lobes facing downward and the cam gear has indexing marks to line up with the head surface if it has 3 indexing markes one should be pointed straight up
5. Adjust the timing chain one tooth at a time and leave all the slack at the back side so the tensioner can take it up
6. With the tensioner in place the lines should be exactly flush with the head on both sides.
7. Install valve cover with new metal gasket and adjust valves (always adjust valve anytime you remove the valve cover.
8. Turn it over by hand counterclock wise again a few full revolutions to be sure everything is clear and you have no binding anywhere.
9. Install the side covers and start her up.
Good luck! Very easy quad to time.
your welcome . I don't do sport atv motors much at all ?, but most of them all work the same way...lol.Thank you very much, glad you all helped me. I'll let you know how it goes!
Thank you very much all the tips and help is greatly appreciated. Thank guys!Also to set the valves after assembly and timing check:
The easiest way is to remove the spark plug, stick your finger over the plug hole and bump the starter until you feel the compression push on your finger Stop there, take a long screwdriver and stick it in the plug hole, take the timing caps off of the left case cover (stator) take you 17mm socket and pull bar and turn the engine COUNTER CLOCKWISE until the -T- mark is aligned with the index mark in the small hole. Hold the screwdriver while you are turning it over so 1. it doesn't bind and 2. so you can feel when the piston is at the top. This will be where you set the valve lash. You will set it to .004 intake and .005 exhaust. You want a tight drag on the feeler gauge too.
your welcome , glad we could help .Alright update on the 400ex.... I got it running and I just wanted to say thanks to shadetree, TRX2fiveO and Slammed ranger. I really appreciate the help you guys gave me. Had a great weekend riding with family and friends, quad gave me no problems. I just wanted to thank you guys agian with all the help that you gave to me and other people when they have questions. Thanks again guys!