Dirty carbs?

[Soloratov]

I can't tell what from the picture, but something is up with the plastics on the right side carb...well, right in the picture. Is it all brittle and cracked? That would be bad. Just doesn't look like it's in good shape.

[jacob92icu]

carbs  .. i dont mess with carbs ... yet ...

air filter ....  ... good grief!! ... does that thing lweigh an extra pound heavier than the new one??.... that is FILTHY!!! .. the inside (dirty side, normally the outside on a car/truck filter) .. actually looks like someone previous to yourself has sprayed 'filter oil' in there to 'help catch the dirt because you use it for foam filters right!? .. so it must be better in here too' ... ?? 

which reminds me i gotta "silicon spray my bike seat again so it makes it easier to slide my ass from side to side in the twisties!!"  ... and yes i have a mate who is that 'elite' a rider that he does this .. claims a '10 seconds quicker' over a particular 2km stretch of twisty road locally!!! ... but he also claims that swingarm flex at 90km/h puts him off .. so he needs a new custom built alloy swingarm with extra re-inforcing! to counter it...  ... he's a good lad really .. just ... young .. 

Ohhhh Janx... Always a pleasure 

Yea the air filter was quite ridiculous.. I hope that makes it run better.

I can't tell what from the picture, but something is up with the plastics on the right side carb...well, right in the picture. Is it all brittle and cracked? That would be bad. Just doesn't look like it's in good shape.

Solor, it's not cracked, but yes I know it looks really messed up. It could be very brittle I'm guessing. I pulled one of the floats off and it wont go back in now. I havent pushed very hard, because I dont want it to break. Is that normal? I am talking about where the float comes out and has the rubber oring.

[Soloratov]

It should kind of, pop back in without much force. It is deformed at all? That will have to be replaced if it won't seat properly.

[Snake2715]

You have to go all the way apart like this:

http://gstwins.com/gsboard/index.php?topic=56601.0

Pull the tops off and all plastics and rubber out (T's are ok left in and carbs can stay mounted together)

Then use an air compressor and tooth brush and guitar pic (or similar object be careful around the brass jets) and clean the jets, blow air through all the small channels like you see here these brass passageways:



Try these links on youtube:

http://www.youtube.com/watch?v=AJh1hxNf7BA

http://www.youtube.com/watch?v=nQ2Crz1wVts

Then check the jets to make sure your working with stock.. sometimes your not and if your not the stock settings are not relevant.

Reset to stock settings as you re assemble. Check ALL orings for flatness, cracks, brittleness, etc. Then reassemble.


If that float wont go back in the oring is probably messed up.. Check it its on the end of the float there get a good look.

I swear by the air compressor. I have sprayed and sprayed carb cleaner through passages with no flow.. one quick blast with the air compressor and bam its clean.

As you blast out the passageways make sure you feel air coming out the other end. You will be able to find where all the passageways go as you blow air and feel.

On the jets hold them up to the light check the holes. They both should be able to be seen through and across from hole to hole. I have used a bread twist tie metal to poke them clean. Again dont go all crazy and scratch them all up.

Somewhere in there you have:
Gunk
Ethanol fuel crap
Bad orings
Leaky floats
Stuck needle valves
etc.

Go through them more than randomly spraying carb cleaner.  I said this before but I personally always take pictures as they come apart. I use a small stainless bowl to drop parts from each carb. I keep the same parts from the left carb on the left carb, I dont mix.

Get the whole things apart. dont spray a compressed air through it with that diaphragm on there. 

[jacob92icu]

My plan was to go through them quite thoroughly, but I am getting complacent and just want to put them all back together, which is probably bad. Any who, Heres some pics. Tell me what you guys think, (what I did wrong/what I should do).



Top on before I cleaned it and bottom one cleaned. The gunk was on there pretty darn good even after soaking them a little bit, so what I did was use one of those tiny flat heads that are silver with the spiny top, to scrap it clean. Left some scratches, anything wrong with that?



I did the same thing with this top half. It had a ton of what seemed to be calcium build up, like a white gunk. The left was the worst. Yes I did remove the gasket before spraying carb cleaner, and I did spray down into the passageways and put a qtip down there to pick up the extra stuff. I thoroughly cleaned the jets and the floats, which turned out to be pretty nice. I just sprayed carb cleaner down the high speed idle and low speed idle a bunch of times and called it good, safe?



Heres everything all cleaned. Plan on putting them back together after buying two new float orings.

[Snake2715]

Diaphragms reomoved and checked.. hopefully before spraying em with carb cleaner.. there are orings in the tops.

[jacob92icu]

Guess what I found?? A ton of crap pluggin up the jet passage way and the main jet area. This is what I mean, if you can see the gunk right in the middle of the hole. It took up like 1/2 to 3/4 of the hole. This explains the fuel starvation and flooding carbs.



On top of that, two pieces this size came out of that passage way as well.



I replaced the two orings on the jet buckets or whatever you call them. This should definitely fix my problem.

I have no air compressor so all I did was use one of my new fuel lines to directly blow into the passage way with a bunch of carb cleaner in there. Seemed to do the trick.

[Janx101]

good result!!  ...

... dont know that there was a TON of crap in there.... by the looks of it with my 'official truck driver guesstimator eye' .. that cant be more than HALF A TON!! 

[jacob92icu]

good result!!  ...

... dont know that there was a TON of crap in there.... by the looks of it with my 'official truck driver guesstimator eye' .. that cant be more than HALF A TON!! 

Haha, i just hope that i got it all. Can't wait to get it all together. Won't have time until tomorrow after work.

[Soloratov]

The plugged jet alone was most of your issue. I wouldn't be surprised if it ran like new now!

[jacob92icu]

Its crazy that its been like that since I've had it. No way that large of a piece  got through the tank filter

[Snake2715]

sweet deal. is that rust?

see she doesn't want to get thrown off a cliff. !

[jacob92icu]

Hahaha... That's a good one. Idk what it was, not rust. To be honest it looked like an autumn leaf lol, and the other piece too. Tonight i will take off the hose and look through the junction/clean the hose. Should i take off those brass flat head high speed and low speed jets and snoop around?

[jacob92icu]

I guess what i am asking is, is there a certain amount of times you thread those high speed and low speed jets in, or is it just until its tight? If i have to do some sort of special tuning after taking those off i don't think its worth it.

[Snake2715]

I don't have the three jets, and my understanding is only the pilot jet accessable from outside the carb is adjustable. The others are all until tight. Don't go crazy either but make sure there snug enough.

Funny story in May was up riding the trails at a buddies house his sons crf150 started bogging we were miles from home. we got her started and drove back home more limped her home.

that night after a few drinks I said lets tear into that carb and see what the deal.is. they hadn't done carb work, but let me have at it. I no more than dropped thw bowl and the main jet fell out! I can't believe it was even running earlier to get us home.

His son had been in there earlier in the spring and cleaned the bowl and jet..... never tightened it enough. Over time it wiggled loose and fwll out.

A good way to check you worry is try to tightwn them first and if they tighten up count the turns. But I dont believe any are adjustable.  No way they would expect you to disassemble to adjust.

[Soloratov]

Jets are not adjustable. They all go in until snug. I believe you are referring to the external mixture screws under the closed caps. Just reinstall the jets as you removed them, and make them as tight as you can without the screw driver warping the slot.

[jacob92icu]

Thanks guys!

Some good info. Idk what they're called, that's just what they were called on my older bike. I just want to take then off and make sure they aren't plugged as well.

[Snake2715]

Yeah you came this far, go to town.

The brass are all jets.

Just the one can be set it seems, as I thought.

[jacob92icu]

And that's the one attached to the float right? How do you adjust that?

[Snake2715]

Ok.

What year is this? Isnt it a pre 01? (I forget what year they switched).

This should be the bottom of the carbs:



That "mixture screw" is the only * adjustable one from outside the carbs. Sometimes its called a pilot jet, etc.

* I lied (the idle adjustment knob can also be done to bring the idle into the 1500-2000 rpm range once the carbs are dialed in and functioning).


The only other "adjustment" you can do is the float height.

That is done by adjusting this arm.. up (when carbs are installed) raises the float height:




Dont adjust float height till you have it back together, and on center stand and have verified its not level with float bowl.. Heres a pic I took:





I can tell you for sure the right side (while sitting on bike) float height can be adjust without removing the carbs. I dropped that bowl and adjusted while carbs were installed.. I would imagine left can be done as well.

So bottom line you have one "mixture" or "Pilot" screw to adjust and that can be done while carbs are on the bike as well. Key here is to reset that "pilot" screw to stock settings or whatever settings you need.

I guess if were being more technical you can adjust the other jets.. but thats done by actually replacing them with bigger or smaller jets, not by screwing them in or out.

Make sense? Answer your question?