New 406 is crapping out need help!!!!

[atvracr350]

Well right now i am in the process of breaking in my brand new 406 bore with an 11:1 wiseco piston and a stage 2 hotcam. I have ridden it for a total of about 25 minutes. When i first rode it i heard like a clanking/knocking noise coming from the engine on the left side. I think there is a possibility that is my chain hitting the guard thing. And it only happens every once in a while. What else could this be. Also when i crancked it up after riding for about 15 minutes i noticed a little black smoke coming from the exhaust. Is this normal for break in or should i be concerned? it wasn't much smoke just a very little bit right at the start up and then as soon as it started up good the smoke quit. Please help me i don't want to keep ridin it if it is messed up. Thanks alot.

[DaveEX7]

Well once you bore an engine, you need to CHILLAX when breaking it in. Don't think a half hour is enough then you go tear up your neighbors' yard. Take it nice and easy not reving the engine to high for the first 3 days.. then gradually pick up the pace. But don't womp on the gas rite after 15 minutes..... it's like breaking in a brand new engine.

[BIGRED400]

If it is black, it's your fuel more than likely,running rich or fat as some say,blue smoke is what you have to worry about,(rings,bearings,etc.):D The noise I would track down before I rode it too much:D

[nakomis0]

If its just a little smoke I wouldn't worry much. The rings may still be seating.

The clanking noise, could be a problem. If its noticably real loud , I wouldn't drive the motor. I would open it up and fix it.

Is it the valves? They tick normally kinda loud if your paying attention to them. Could also be 1 or 2 are out of adjustment.

[Chanman420q]

take it easy for the first 2 hours, then whomp on it, the rings seat in the first 15 mins anyways. so run em hard for that first 15 to seat them tightly. then be easy on it

[Florida400EX]

check your rockers, and gap them correctly.