Porting and Polish??

2StrokeBlaster

New Member
Jan 9, 2009
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i do not understand that this actually is. i hear alot of people talking about it and i want to learn about it and do it to my blaster. can someone give me info on it and what it does? because i have no idea and i want to make my blaster faster. another thing. head milling? what is this? can you just get your head milled? or do you have to get a matching piston and everything with it?

please all info is appreciated alot
 
do a search there is a lot of topics on this.....or a tech will chime in for you and explain it all... or talk to flotek.....kennedy...or wildcard about it
 
you cant port and polish yourself, what they do is make your intake/exhaust ports larger and smoother for better air flow. Milling is a process where they remove some of the deck on your head for a smaller combustion chamber thus allowing higher compression=more horsepower. but yeah this is all stuff you cant do yourself without the proper tools and equipment. Dont quote me 100% on all this, its just my small background knowledge and a small explaination
 
^^^all good stuff. More importantly, porting is not something to do without some knowledge and experience, some of which will be gained making mistakes. You don't want to do that with your one and only Blaster engine....the Pros have f'd up alot to get to their current level of knowledge. :)
 
a blaster cylinder has a really poorly designed intake and exhaust port......think back it was designed in the early 70s, a port job will update that 70s design to a newer more advanced design (depending on the builder). overall i would say its needed on every blasty cylinder for it to reach its fullest potential
 
yeah i forgot to mention that, i attempted to port my g23lh on my goped sport b/c i had an extra cylinder, needless to say it had no compression and ran like ass after i ported it waaay to much. you live and learn
 
i was once in the same boat you are in right now.....along w/all the builders out there. everyone has to start somewhere. i bought lots of books, did lots of reading, and bought some TSR software to use. not to be a smartass or anything, but if you don't know what "port and polish" or "head milling" means, you don't want to just start tearing apart your engine and start doing it yourself. you'll wreck something faster than you can eye blink. porting involves changing port shapes, sizes, durations, roof angles, hook angles, etc, to achieve a particular powerband.....meaning low end motor, low-mid, mid-top, or all top end. head milling can be as simple as just doing a straight cut, to lessen the squish clearance and up the compression ratio, or it can get more involved, where you cut the squish band angle to a specific angle, cut the squish band angle to have a certain area ratio, or a certain squish clearance, or a certain cc volume, or a certain MSV (maximum squish velocity)....not to mention that all of this has to be setup for the certain powerband that your porting is setup for....they have to compliment one another, not fight one another. also, your pipe has to match the head and port work. if you need porting or headwork done, i can do that, as i have access to the correct tools, etc. others like flotek and kennedy power, can help you out too. for porting, you need some good "foredom" and "cc specialties" tools. your typical dremel will be crap for this "artistic" type work. plus, in order to do the transfers properly, you need the 90deg handpiece from cc specialties. you'll end up spending $800 or so, tools to do the porting alone. hope this helps. if you are still set on doing it yourself, be prepared to spend some $ on books, some $ on tools, and some $ on replacement cylinders, to replace the ones you will probably ruin.
 
i saw one thing i wanna clear up.. somebody said more compression = more HP.. that not completely true.. in fact too much compression will hold back high RPM and therefore upper end HP.. also "milling" a head.. ore removing material from just the gasket surface is not an ideal setup.. yamaha left much to be desired in the way of 2 stroke combustion chamber design..
 
he's talking about re-designing the geometry of the head combustion area. that head is kinda a pile.....just like the stock ski-doo 600ho heads.
 
i saw one thing i wanna clear up.. somebody said more compression = more HP.. that not completely true.. in fact too much compression will hold back high RPM and therefore upper end HP.. also "milling" a head.. ore removing material from just the gasket surface is not an ideal setup.. yamaha left much to be desired in the way of 2 stroke combustion chamber design..

too much compression, like full stroke ratios of 15:1 and higher, have little gains, as most of what would be gained, gets lost to pumping loses.
 
so how much do you recommend milling it to so i wont get too much compression

theres a thread stickied on top of the engine forum, it shows increments of 10 thousandths i believe and the more you shave, the higher the compression. also higher compression does=more power, but to a certain degree. just like eating a whole box of oreos is a mistake, too much of a good thing is never good lol