Hi, i rebuilt the top end of my motor on my ltz 400 2005 last winter and since that i had difficulties to start it all summer. It take me about 4 hours to start it the first time after we finish rebuilt it. When he run he's A1 but Now it been like 2 or 3 week i dont start it and he won't start just like the first time i try after rebuild it. Compression, valves, ignition, everything is good but he dont want.. Help please. Thanks

 

Change the plug, even if it is new, it could be a dud. Have you double checked both valve timing and valve clearances? If so, check compression. If that is OK, clean the carb out, paying particular attention to the choke, is it working properly?

 

[QUOTE=merryman;3309573]
Yeah i change the sparkplug this weekend and its not better. I Also check the timing and the clearance their good and the compression too. Choke is working and gaz go to the piston. Can it be a problem with the coil?

 

Got spark?

 

[QUOTE=LT80;3309606]
Yes and we test it with a testor and the spark is good