Removing Air Box and fitting single filters on the carbs

[Nholmes1987]

I was wondering if anyone has any special tricks after installing air filters on the carbs as to making sure the air intake lines/hoses don't get dirty. Or if there was a way to remove them entirely and make sure the vents don't get dirty?

[Nholmes1987]

I guess what I'm asking is when you take the air box out, there are a few hoses that are just flopping around. Is there a way to prevent them from sucking in dirt or an alternative to get ride of them altogether?

[crazy steve]

You can't 'get 'rid' of any of them on your '78. The two smaller hoses are your carb vents, and those need to be in place and open. Install some small filters on them, although use 'vent' filters, not fuel filters as those won't always flow enough air if they get fuel on them. The big hose is your crankcase vent, again use a vent filter.

You'll likely have to rejet/tune your carbs with pod filters, and also make sure the filter inlets don't block any of the holes in the carb bell...

If you're looking for a performance increase, you probably won't get one; the main reason most replace the stock airbox is damage or the difficulty of installing/removing the carbs.

[jetmechmarty]

If you're looking for a performance increase, you probably won't get one; the main reason most replace the stock airbox is damage or the difficulty of installing/removing the carbs.

With just a little practice, removing the carburetors with the airbox installed only takes a few minutes. I think it was PLANEDICK who made a "how to" video.

[James England]

With just a little practice, removing the carburetors with the airbox installed only takes a few minutes. I think it was PLANEDICK who made a "how to" video.

I used that video. Removing carbs is dead easy now, even with the OEM airbox.

[Manifesto]

The two smaller hoses are your carb vents, and those need to be in place and open. Install some small filters on them, although use 'vent' filters, not fuel filters as those won't always flow enough air if they get fuel on them. The big hose is your crankcase vent, again use a vent filter.

I'm going to be getting some K&N air filters as well so my question is what K&N vent filters are the right size for the carb & crankcase vent hoses?

[tjdudeman]

My bike has the individual pod filters. What I did was I put on a new longer hose so that was pointing towards the back of the bike and it is out of the way of the pod filters and they dont suck in any of the exhaust it is producing.

[natemoen]

For the carbs K&N Part No. RC-0984.

For the crank case vent I would not suggest leaving it open like tjdudeman says. It does suck and blow so you don't want dirt and bugs getting in there to the oil. Instead of an expensive k&n filter just get a generic crank vent filter from an auto parts store.

[tjdudeman]

For the carbs K&N Part No. RC-0984.

For the crank case vent I would not suggest leaving it open like tjdudeman says. It does suck and blow so you don't want dirt and bugs getting in there to the oil. Instead of an expensive k&n filter just get a generic crank vent filter from an auto parts store.

I have a small air filter on the end of it, sorry forgot to say that.

[TADracer]

Here ya go!

Crankcase filter arrangement I use



Here is a picture of my old setup and you can see the small filters between the air filters. One thing I would recommend over this is to get those lines up higher than I had them (like up to the frame rail above) and that will seem to eliminate a bunch of carb dripping.

[tjdudeman]

TAdracer,

What fuel filter and crank air filter did you use? That looks like you did a great job. Mine was sort of thrown together with what I had because I was strapped for cash at the time.

[Manifesto]

Looks awesome! Thanks for the help guys.

[TADracer]

I got the crankcase filter several years ago from DennisKirk.com as I recall. It is made for the situation and has the correct size inlet at the bottom and a small stud for mounting on the top.

The vent line filters are just automotive fuel filters from Pep Boys that I fitted to the hoses. But like I said, you need to get them up higher than in the picture. They do work fine, are easy to replace and do not let any dirt into the bowl from the vent hose.

[James England]

That's a nasty ole inlet manifold you have there!

[TADracer]

That's a nasty ole inlet manifold you have there!

I know. They dont leak however. I have a set of new ones on hand but just have not gotten around to installing them. Everything is running so good right now that I dont want to upset the apple cart.