Use a catch can with the return line back to dipstick hole , it saves seals if you get any blow by ( and you will ) and its a passage to remove hot air ,on big bores everything helps ,but you do not have to , it just cuts down internal pressure .

 

I was thinking the same thing on mine. Its a mess. I used fuel injection clamps and it still leaks. I am going to get a new tappet cover and weld in a -6 an fitting into in and just run that back so I know it wont leak.

 

I just used a dress up tappet cover and put a threaded 3/8" fitting in and put 1/4" hose. It was so hard to get the hose on thers no way its gonna leak. As for performance, i have no idea of it actually makes a difference. I know what its suppose to do but ive never had a problem not running one. I rock one because it looks cool lol

 

I took it off of my 124+R, my 192cc YX, my TB117, All my engines. Your right there a mess.. IF you keep the crankcase breather clean and not blocked or kinked at all there is blenty of room for blow by. But if you ride in the mud and get the crankcase breather tube blocked then you can pop seals.. I use my bikes on the stret so head breathers and oil coolers are gone and have been for years with no issue..

 

The best thing to do is use the stock vent location. It has an internal baffle. I drill and tap it for a #6 AN fitting when I have them apart.

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The best thing to do is use the stock vent location. It has an internal baffle. I drill and tap it for a #6 AN fitting when I have them apart.

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Here it is

 

So what did you do geezer? Did you just drill the stock vent larger, then add your own adapter so that you can attach a braided line to it?

So taz are you saying that the stock vent is enough to keep internal pressures down as long as the line from it isnt clogged? So the only real reason for the head breather is more like a secondary for if the stock line it clogged or just as a cosmetic thing?

 

I drill and tapp a new hole that faces up. Then drill and tapp and plug the old hole. I like the vent facing up.If oil gets in the hose it can run back down. This mod is used on big motors. The big ones CAN try to move air in and out more as the big piston goes up and down it tries to work like a big air pump. The Motor on the bottom is a 201. Honda made a baffeled chamber down there that helps seperate the oil and air.

 

Circled below is the baffled chamber geezer is referring to...

 

The Vent allows pressure AND heat to escape the cylinder head ...

 

Ok so the head breather is pretty much unecessary? That is unless the stock vent is clogged?

 

Correct on your Honda engine 108cc you dont need a head breather.. Geezer thats trick for a 201cc

 

Ok so the head breather is pretty much unecessary? That is unless the stock vent is clogged?

They use that as a supplement. The stock one is kinda small. That's why the big china motors use a bigger vent. So of you ever split you're cases its a good time to do it. Most motors are ok without a big vent. Blowby from rings cam cause it to blow oil too

 

Like what you did Geezer, looks tricked out for sure! But wouldnt you also want to relieve pressure on the top end? ie the head breather

 

Its all still the same pressure.More to the crank area, is the pressure. Cant hurt to run one but not necessary with big vent. I run the hose strait up under the tank.

 

Now all we need is a vaccum pump hooked to that vent and low tension rings and we cam get some more power!

 

Idk about like the 107s and bigger but I've heard they are worthless on 88s...