Anyone dared dismantle their carbs...

[anutz]

So i have my bike in pieces waiting for the cylinder head to be sorted out....


I was thinking about cleaning the carbs, i might have blocked pilot jets....maybe...when i crack the throttle its ropey as hell, and i had already checked the vacuum pressures/idle/tps etc that were in tolerance...


Anyone done this - it looked a little difficult initially, but after understanding how they work and what is inside them i am not too daunted...


Experience....?

[Paulfzs]

theyre pretty easy to do, id do mine but im not taking them off again it took me forever to get them back on.

[peteski]

They're tricky to remove, although it does get easier every time you do it. Once you have them on your bench it pretty strait forward: Keep your work area super clean, and take your time. Don't split the four unless you have to, which is unlikely. Do them one carb at a time so every part goes back in the same place. You're supposed to replace all o-rings when you do this job but that's your call.

[anutz]

removal was a bugger, i had to get the cylinder head out, for another reason, and those little screws that connect it to the inlets are awfully tricky....


I might give it a go based on the idea of one at a time and no full dismantling..


Cheers

[Fazerider]

Worth doing, I'd say... particularly since they're already off the bike and you are experiencing problems that sound carb related.
Take care with the float bowl screws, they can be very tight.
Once in there, you may well find some debris to clean out, the zinc alloy casing, steel and brass parts will have produced some corrosion products if any moisture has found its way inside.

[anutz]

i will start tonight i think - shall post updates as i go! 

[ChristoT]

What Peteski said

Did mine recently for the first time. The advice I got was:

- Dismantle 1 carb at a time.
- have 4 labelled bowls at the ready, and keep the parts for each carb separate.
- Take your time! Make sure you aren't going to be disturbed for a spell, they are time consuming.
- Have carb cleaner, toothbrushes, etc to hand before starting.
- When removing the pilot jets, first nip them up lightly, and count how many rotations it takes. Record this, then remove them. Makes it much simpler to return to original settings

[unfazed]

What Peteski said

Did mine recently for the first time. The advice I got was:

- Dismantle 1 carb at a time.
- have 4 labelled bowls at the ready, and keep the parts for each carb separate.
- Take your time! Make sure you aren't going to be disturbed for a spell, they are time consuming.
- Have carb cleaner, toothbrushes, etc to hand before starting.
- When removing the pilot jets, first nip them up lightly, and count how many rotations it takes. Record this, then remove them. Makes it much simpler to return to original settings

I think you mean pilot screws


The secret is cleanliness, the cleaner the area you are working in the less problems, if you remove the diaphragms don't let petrol near them or they will swell. Try putting the covers back on over swollen diaphragms 
Christos advice is good 

If there is a blocked jet, I usually use good quality cellulose paint thinners to wash them and use a fine brass wire to poke through if necessary (I use the bristles of a soft brass brush), don't use anything else brass on brass does no harm but steel on brass will.
Be careful not to over tighten the brass jets and don't lose the needle guide above the emulsifier tube, (Yamaha call it the Main jet holder) they are a push fit and the odd one can fall out.
Use good fitting screwdrivers and sockets

Again as Christo says take you time.  I have agreed with Christo twice

[sgpwwg]

I have cleaned my carbs and also cleaned a spare set just in case.
I got 2 cans of high pressure spray carb cleaner from halfords, 4 plastic dishes and small wire file set from eBay.
Using a screwdriver that fits really well remove the fuel bowls and take a few pictures on you mobile so you see how it all goes back together. Place all the items per carb in numbered trays with enough carb cleaner to cover all the items. Using the spray clean the main body and let dry. Now clean, gently using small file all the jets etc.
If you are removing the diaphragms also beware the top covers can be tough and a good screwdriver is essential. Check the diaphragms to see if they are loose or baggy as this can cause poor running, misfires etc. I purchased a second set of carbs from fazer spares for £40 to replace mine.
If you take you time initially you will find this a simple job that makes a big difference.

[Paulfzs]

today i am going to mostly be attacking my carbs because im bored.


im going to regret it.

[anutz]

what can go wrong....look at me with the engine studs   

[Paulfzs]

when i did the engine change it took me 45 minutes to get the carbs seated again!

[anutz]

yeah not looking forward to that, once I have the head torqued down and assembled I will have to put the airbox back in and then deal with the carbs....they were the worst thing to remove!

[unfazed]

when i did the engine change it took me 45 minutes to get the carbs seated again!

Wipe the inside of the rubbers with WD40 and the outside of the carb edges, make sure all the clamps are loosened to the point where the screw is flush with the nut and they will slide in fine 

[Paulfzs]

used much lube today, and much anger.. followed by a big dose of man strength, took 15 minutes to get them all lined up this time.


its like the grooves in the back of the airbox are there for a jack handle

[anutz]

will see what happens when I put mine back on - waiting for 3 engine nut washers before I can sort the head out....then im good