Chainsaw Repair

All so remember what works on your 359 will not work on say a stihl 460 or a 7900, you have to treat each different motor design as its one motor and figure out how to make it run , BMEP is this ratio but in most cases the larger the motor the lower you have to make your BMEP cause the higher the BMEP the more heat you are going to create and heat is what tells you if the motor is going to live or die . Also donot get caught up in the computer aids helping you build stuff cause most will let you build a motor that just cannot run or even come close to running  as they will say its ok to raise your transfers to a unreal number , same with the ext port . Your best to take small steps and learn as you go and take notes on what you thought worked and what did not , on a 359 just goes easy on the porting and do the muffler mod and you will be surprised at how well your saw will run , porting is not done by the pounds of metal removed from he motor , some motor you can do quite abit of porting and they work great where others donot like their porting numbers changed alot