Make sure you clean out the fuel petcock every service and have a fuel filter inline to minimize other gunk like rust etc getting in to the carb. Prevention is always better than cure!
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to do a valve adjustment
1. the engine must be cold and not warm/hot.
2. you should find the TDC (top dead center) on the compression stroke. i.e. both valves will be in closed position and you will have a little play on the rocker arms. you might need to turn the engine another rotation to line up the markings (the first time it lines up, it might not be the tdc on compression stroke)
3. refer manual and get the tdc as mentioned in step 2
4. make adjustments to the specified clearance. a little on the loser side is better than too tight of a clearance.
lastly do some reading and watch some videos or maybe a observe a mechanic do it, most hardly use a feeler guage though, but you should get an idea of the procedure.
here i found something that might help you: this is essentially similar to a zma engine and the procedure applies to almost all motorcycles.



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