Simple video on drilling boyesen ports in a 1983 YT175 cylinder.
Пікірлер: 23
@RubberSalt11 жыл бұрын
They allow more flow to the bottom end. They also dont quit flowing when the piston covers the port. On the down stroke, they allow the fuel /air to fill the intake and out the transfer port next to the reeds. Youll see them on ALL the dirt bikes out there, snow mobiles, etc. They are good stuff.
@HamBone863 жыл бұрын
Does drilling the holes sacrifice top end power?
@RubberSalt3 жыл бұрын
@@HamBone86 Almlows for more top end
@RubberSalt3 жыл бұрын
@@HamBone86 Negative. It actually benefits top end power. The angle of port does play into power delivery. A port that flows in straighter will favor higher RPM. Ports that flow more towards the bottom of the transfers favor more mid range. Ports need to have sharp edges in the transfers.
@phodailey2 жыл бұрын
Gotta love the extra power
@denniswilder30142 жыл бұрын
Any jetting change after doing this.or does it make it picky or peeky power curve.
@RubberSalt2 жыл бұрын
You should definitely check your jetting after. It improves the mid and upper range power the most
@oblixerated12 жыл бұрын
what other engine fits this frame?
@oblixerated12 жыл бұрын
what do boyesen ports do?
@shoominati236 жыл бұрын
Will that fit onto a DT 175?
@RubberSalt6 жыл бұрын
shoominati23 they probably will. Im not familiar with the dt175 top end.
@getawaywithchen19297 жыл бұрын
what is the advantage of drilling this holes?
@harisivanandhks39066 жыл бұрын
It gives more fuel flow to the engine and gives more power
@goodfellasinc.56485 жыл бұрын
Not shit when you port them right to begin with
@RubberSalt3 жыл бұрын
@@goodfellasinc.5648 They help flow more mid and top end power. If you look at any modern high performance engine with reeds on the cylinder, you'll see them. Adding these is part of porting them right.
@jcwar67533 жыл бұрын
@@RubberSalt so can you do this to pretty much any 2-stroke?
@RubberSalt3 жыл бұрын
@@jcwar6753 Only those with reed/disc intakes on the jug. Piston port or case induction wont work
@gilsongonzalez40119 жыл бұрын
espanish???
@RubberSalt13 жыл бұрын
@digschopper Wish i made a video of the pipe i built for this YT :) search "pipe design" on 3wheelerworld