Battery vs. Mufflers vs. Air Filters vs. Jets

K

Kain

Been Around the Block
Hey DTT friends I have a situation in which I can't make up my mind.

I have a CB360 and I replaced the stock mufflers with some short straight ones like these: http://www.oldbikebarn.com/Universal-Slash-Cut-Muffler?sc=2&category=37
They're just straight pipes no baffles.

I like the look and the noise they give.

Ever since then I've been fouling plugs like a crazy person which I'm pretty sure is because the fuel air mix is off now. (This makes sense obviously.)

My dilemma is what should I do?!

Should I look in to pods? I like how they look but is there a way to install them without needing to get a different battery or losing the battery all together? I can't seem to think of a way to use pods with that giant battery box in the way. What do most people do with their battery when they go to pods on CBs?

Should I get new smaller jets instead of trying to even the mixture out with more air? I bought a jet kit from DCC but was wrong about sizes and it only goes larger not smaller.

Or could rebuilding my old air filters (which are pretty dirty) solve the problem?

I'm a major noob with carburetion and even after reading through the Carb theory 101 thread about 15 times I'm still really confused on what my best route would be. Is there just some magic screw to turn to make all my woes go away?

Like I said I've been over and over it and I think I need some sound advice.

Thanks in advance guys.
 
If you have more air, you need more fuel. A less restrictive exhaust is "pulling" more air through the motor. (Crappy description, but I think youll get the point) If you run pods, youll need BIGGER jets and more fuel. As far as the battery box being in the way, thats up to you. If youre keeping the side covers, you should be able to fit pods in place of the stock filters and keep the box.
 
So my assumption that my exhaust change is causing fouled plugs because of too little air is wrong? It's actually too much air? My plugs are always covered in black soot and when I clean them off or put in new ones it runs better after.
 
Are they "wet" when you pull them? With stock (dirty) airboxes you probobly are running rich. Have you adjusted the mixture screw at all?
 
Nope they're totally dry as a bone when I pull them. I am running the correct plugs.
 
Dang... I thought "a black dry fluffy colored plug is caused by deposits from a carburetor that is running too rich (too much gas) cause: dirty air filter, air mixture screw or carburetor needs adjusting, carburetor float height is out of adjustment or float is sticking open." or at least that's what the guide I'm reading says.

I'm sure my floats aren't sticking cause I checked them. I guess I'll have to twiddle my air mixture screw?

This is why I'm confused. HAHA
 
Yep, lean....and it makes good sense too just like mike has explained, you motor is moving air more freely so you will need to increase the amout of fuel now!

Any time you change the exhaust or intakes on a carbed engine, you will need to rejet or at least adjust the mixture screw.

On the battery, no need to move or change it if you want to run pods, you can fit them in there, just need the right ones!
 
Without seeing them I cant tell obviously. If they match up to the pic you have, than go that route. Dry to clean the air filters...
 
If they are black and fluffy, you've got to be rich...?

Does it back-fire upon deceleration? If so, your lean...

Is it doggy in the top end? if so, your rich...

I would try playing with the needle a bit. lower it one. Ride, then pick it up one and ride. See what happens. If your exhaust is poorly made, it could very well flow less than stock. Shiny doesn't always mean performance.
 
Just get the pods on before you monkey with jets or mixture screw, as having the pods will again require the jetting work, best to just do it one time rather than twice.....once you get into that, you will see what I mean!
 
My understanding is that high-flow "baffle-less" exhaust is usually accompanied by high-flow pod filters, simply because you have to let in as much air as the exhaust is letting out. Since you have the stock airbox, you're creating a vacuum effect; the air is flowing out of the exhaust more quickly than it's entering the carbs. So the pressure difference inside the carbs results in more fuel being sucked into the engine. More fuel=rich mixture.

I think...
 
tjb2of3 said:
My understanding is that high-flow "baffle-less" exhaust is usually accompanied by high-flow pod filters, simply because you have to let in as much air as the exhaust is letting out. Since you have the stock airbox, you're creating a vacuum effect; the air is flowing out of the exhaust more quickly than it's entering the carbs. So the pressure difference inside the carbs results in more fuel being sucked into the engine. More fuel=rich mixture.

I think...
Click to expand...

Motor cannot expel more exhaust than air being taken in. I would simply move to a hotter plug. And I'll bet your good. Until you install pods anyways.
 
How is the bike running? Swapmeet Louie pretty much nailed it. Depending on the symptoms, it will tell you which way to go.
 
eddie murphey sez... check your exhaust for bananas

huurrrr hurrr hurrr hurrr
HALF!.jpg
 
Man thanks for the help guys!

Swapmeet and Von you guys are awesome (and everyone else).

The bike does run fairly well at lower/city speeds but when I hit the highway it boggs pretty badly.

Now I know. Pods first. Then monkey with the carbs. Or monkey with the carbs now if I don't get pods. I know I need 50mm pods from an other post today. So which ones should I get? Any sugestions? I was thinking about these:

http://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-streetfighter-motorcycle-parts-airfilter-pod-k-and-n-52mm-12-55752.html

they have a 48mm and a 52mm I'm wondering if they will fit?! Probably the 52's then tighten them up real good?

<b>I mean with my battery still in place.</b>
 
El Granto said:
Man thanks for the help guys!

Swapmeet and Von you guys are awesome (and everyone else).

The bike does run fairly well at lower/city speeds but when I hit the highway it boggs pretty badly.

Now I know. Pods first. Then monkey with the carbs. Or monkey with the carbs now if I don't get pods. I know I need 50mm pods from an other post today. So which ones should I get? Any sugestions? I was thinking about these:

http://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-streetfighter-motorcycle-parts-airfilter-pod-k-and-n-52mm-12-55752.html

they have a 48mm and a 52mm I'm wondering if they will fit?! Probably the 52's then tighten them up real good?
Click to expand...

If it bogs on the highway, your rich. If it's cutting out @ highway speeds, your lean. I would move to a hotter plug like I said and see where that gets you.
 
Swapmeet Louie said:
If it bogs on the highway, your rich. If it's cutting out @ highway speeds, your lean.
Click to expand...

Waiiiiiiit a minute... how are these situations different?
 
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