Discussion in 'The Garage' started by dlabkeeg, May 29, 2010.
Today, it's an emissions or pollution thing. Years ago, all engines vented to atmosphere, even cars.
Like the factory did it? Well yeah!
That's my goto, a big part of why I stick with stock air boxes in front of stock carbs.
Specials 80 up
One I made for madness. a 79 750; used a later breather box and plumbing then made some copper risers and flanges to penetrate and seal against the uni filters.
The set up always goes down then back up to the airbox. I think the theory is at lower speeds any oil escaping the crankcase sits in the plumbing, then at higher RPM increased air flow pulls it through the carbs to be burned in the combustion chambers.
Not all cleaned up for viewing! several thousand miles since installed.Much of that running hard.
Skull told you what would happen if you let gary's messy bench near a nice bike...
I used a catch can made for a go cart when I removed my airbox.
Where'd you find that?
I found mine at O'Reillys Auto parts. Tho they couldn't find it in their system.. I spotted it on their hooks lol
Its just a Ford etc.. style old brake booster check valve
I tried to find one at advanced auto a while ago but I didn't find anything
They're part of the Dorman universal line of Help! products, part # 80190 .....
Power brake check valve into some short black tube, clear vinyl running down the back of the engine, under the carbs. Curves up to the frame spine, topped with a cheap push-in breather filter between the foam pods. It keeps everything in the area well oiled, although it seems like less of a mess since I replaced the O'Rilley's 20w50 with Castrol GTX.
Heres my solution to the problem and even has a vacume gage to let u see wat ur makeing . Comes with all mounting hard wear and even the hose to attach it with and clamps for 25 usd. Shiped right to ur front door has a filter built in and everything a man could want for the price it blew my skirt up anyway
Where might I ask you purchased those filters? Great set up!
Its called a oil tank and at wish .com if u look around a bit u can snag the 1 like i got with internal filter,hose & clamps and even a vaccum gage just for good measure in a veriety of colors for lik 20 bucks
Interested in your comment that pod filters will cause carb tuning issues. Can you please elaborate? Thanks.
Pleated K&N type pod filters are the troublesome ones. The pleats disrupt the air flow, make it turbulent, and that messes with the slide lift on these CV carbs. Best pods to use on these are the straight foam UNI pods.
Thx. I’m running 32mm PWK carbs. At the filter end they are 54 mm or close to 2-1/8”. Had a look at Uni’s website an it looks like the diameter jumps from 2” to 2-1/4”. Does the urethane flange have enough “give” to stretch the 2” over my 2-1/8” carbs?
The PWK are a regular slide carb so you could use the K&N type filter on them. But yes, if going with a UNI, the 2 1/4" will tighten down just fine to 2 1/8". The 2" version would be a stretch and very tight. I don't recommend it.
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