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if its a 4 stroke and its the breather pipe then your getting pressure build up , what colour is the smoke , white or blue ? white is water and blue is oil ! water could be a seal or gasket leak , oil could be valve seals or stems or compression leak !
Top end engine rebuild. Sprocket size depends on the type of riding. Standard should be OK for motocross. If you need more top speed install a larger front sprocket and a smaller rear sprocket. Divide the rear sprocket teeth by the number of teeth on front sprocket e.g 48/14 = 3.43 a lower number means higher top speed 45/15 = 3.0 but compromised performance at lower speed. For tight forest riding and steep hills Rear 48 front 13 = 3.69 etc is preferable.
Have you checked for a spark? or done a compression test? You may need to adjust the idle screw or tick over screw slightly 1/4 turn at a time (remember where you started.)
Hello Brad...every brand has there own valve clearance to follow, you might contact Husqvarna distributor in your place, for sure they know it.You can play with it and you'll notice a noise or a smoke once your opening is not right.
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