Hose on airbox / which intake boots are plugged?

[jkluczyk]

120's might not be too big. In my opinion, I'd like to err on the side of too rich rather than too lean. I've burnt holes in too many pistons by running too lean. I'm getting to be a pro at piston replacements.

I'd say, try the 120's and check your plugs after some miles and see.
If you don't have the stock exhaust, ie. some other aftermarket ones and you're adding a K&N, then upping your main jets one or two sizes is where you might need to be anyway.

Make sure the float height is GOOD! and you probably will want to verify that the actual fuel level is where it needs to be in the bowl too. (you can do this by using some clear tubing in the bowl drains.)
Having the fuel height incorrect will greatly affect your performance.

That's what I figured on jetting, I figured two sizes up wouldn't make much difference. So far it's the stock pipes..but as of right now it's straight pipes.


Yeah, i was reading earlier today about the float level, i guess i should double check that since the carb is still off the bike.

I just bend them to the correct height?


Hey, and thanks everyone for chiming in!

[Radioguylogs]

One question I had to ask when restoring the stock airbox to my SF involved those two nipples on either side of the crankcase breather hose on the airbox. Those go to the vent for the float bowls on the carburetors.

I heard from other members these connections were not used in later models. (maybe '80 and '81?)

Therefore, you should probably make sure those nipples are plugged. If your airbox is a late model, they were probably never opened.

[jkluczyk]

One question I had to ask when restoring the stock airbox to my SF involved those two nipples on either side of the crankcase breather hose on the airbox. Those go to the vent for the float bowls on the carburetors.

I heard from other members these connections were not used in later models. (maybe '80 and '81?)

Therefore, you should probably make sure those nipples are plugged. If your airbox is a late model, they were probably never opened.

Plugged airbox



Okay, the hose my finger i'm pointing to I assume goes into the octopus. I have no more outlets anywhere that i can find were that intake hose goes too. I'm assuming just to plug it?

[natemoen]

That hose your pointing to in the second picture is for the vacuum advance. That needs to be plugged into the #2 carb boot. So look on the left side of the #2 carb and you will see a nipple for that hose.

[jkluczyk]

That hose your pointing to in the second picture is for the vacuum advance. That needs to be plugged into the #2 carb boot. So look on the left side of the #2 carb and you will see a nipple for that hose.

Correct me if i'm wrong, but that goes to the octy?

Which leaves the last hose on the carb 1 boot. Which i'm not sure if that should be on 1 or 2. They got mixed up after I took them off.

[motoman]

That hose your pointing to in the second picture is for the vacuum advance. That needs to be plugged into the #2 carb boot. So look on the left side of the #2 carb and you will see a nipple for that hose.

Hmmm....... that was a bit confusing Nate
That hose your pointing at goes to nipple on #2 carb...........not carb boot.

[natemoen]

Correct Brant, I didn't mean to have the word boot in there.

Follow that hose down to where it begins. Does it go into the left engine side cover? It does, then it must be connected to the #2 carb, it is for the vacuum advance.

[jkluczyk]

Correct Brant, I didn't mean to have the word boot in there.

Follow that hose down to where it begins. Does it go into the left engine side cover? It does, then it must be connected to the #2 carb, it is for the vacuum advance.

Not to be further confused, then you mean the octopus on carb #2? or on the actual carb?
That still leaves one intake boot with a hose to no where, unless it should be capped off. Sorry, i'm still new to this coming from 2 strokes...

[natemoen]

Not to be further confused, then you mean the octopus on carb #2? or on the actual carb?
That still leaves one intake boot with a hose to no where, unless it should be capped off. Sorry, i'm still new to this coming from 2 strokes...

With a special you will only have 1 thing plugged into the carb intake boots, and that will be the octy. The other 3 intake boot will just be capped off.

The vacuum advance is the only thing that should be plugged into the nipple on the #2 carb. That is the only place that the vacuum advance should be connected.