The non working of the genuine heads will effect the engine and you should consult a mechanic as soon as possible. The bike needs an engine repair, which may be the replacement of its pistons and rings and making the engine brand new from a mechanics point of view. Engine parts undergo a lot of wear and tear during its run on the roads and specially our Indian traffic conditions and roads are making the engine life worse for the commuter level bikes. Time to time service and defective part replacement is the only way you can save your vehicle from getting to its end.