1978 CB550 K3 "running" restoration

[Bryanj]

Cant remember exactly but the CB550K3 supplement is mostly about carbs and settings

[SPR]

Ok - need a little assistance ....

Got the carbs off without much trouble but did notice that the two middle rubbers to the air box had no clamps

The carbs look to me that they have been cleaned ?

I’ve checked all main jets and all are clear and clean

I did find that the mixture screws had all been set to just less than one turn - could this have been the problem of not wanting to rev easily above 3500 rpm ?

I’ve noticed that one float ( 2nd from left ) has no springiness to it - all the others you can gently tap and they go down and up ?

What do I need to do to this float please ?

All the pics are as. I’ve found it - nothing cleaned inside or out

Thanks

Simon


 

[Nurse Julie]

Sound like you need a new float needle for the one that isn't springing correctly.

[hairygit]

Also, the pilot jets could have been incorrectly adjusted because of the air leaks where the clamps were missing. The clamps need to ALL be fitted and tight, otherwise random air leaks will mess with the mixture and you will never get it running smoothly and reliably.

Sent from my POT-LX1 using Tapatalk

[SPR]

Sound like you need a new float needle for the one that isn't springing correctly.

I was worried it may be that - I've removed pin / float black thing and the needle is clean and springing properly

So I've slightly adjusted the metal tang bit that touches it and after a little trial and error it now moves and springs like the other three

[SPR]

Also, the pilot jets could have been incorrectly adjusted because of the air leaks where the clamps were missing. The clamps need to ALL be fitted and tight, otherwise random air leaks will mess with the mixture and you will never get it running smoothly and reliably.

Sent from my POT-LX1 using Tapatalk

I was wondering that ...... best get some ordered

Thanks

Simon

[taysidedragon]

Sound like you need a new float needle for the one that isn't springing correctly.

I was worried it may be that - I've removed pin / float black thing and the needle is clean and springing properly

So I've slightly adjusted the metal tang bit that touches it and after a little trial and error it now moves and springs like the other three

You probably need to check the float level on all 4 to make sure they're right.

[SPR]

Sound like you need a new float needle for the one that isn't springing correctly.

I was worried it may be that - I've removed pin / float black thing and the needle is clean and springing properly

So I've slightly adjusted the metal tang bit that touches it and after a little trial and error it now moves and springs like the other three

You probably need to check the float level on all 4 to make sure they're right.

Thanks

I know I've read it in a thread somewhere on here so will have a search

Simon

[Bryanj]

Look in the 550K3 supplement and be careful on the modle as there are 2 different float heights

[SPR]

Look in the 550K3 supplement and be careful on the modle as there are 2 different float heights

Yep double checked

Bit of a result .... put it all back together after having to heat the rock hard rubbers !!

Also replaced the air filter with a new one as the one in it looked original

Ran like a rocket

So not really sure which bit cured it but wonder if the float that was wrong was starving one of the cylinders ? or the mixture was so weak

Anyway now to sort the head gasket and progress on the other bits ... waiting on parts for a few days

Thanks for the help 

Simon

[Bryanj]

Well done, told you so(my wife tells me a dance goes with that!!)
Seriously you tacked one of the worst jobs so all good from here

[SPR]

Bit more progress

Frame tidy up under the seat and new Continentals front and back

Cheers

Simon

[SPR]

Quick question on Carb mixture screw

I'm just changing the gaskets with genuine ones and changed the rubber washer with the new one in the kit .....

It seems slightly smaller than the old ones coming out and does mean that when setting the screw the closed screwed in starting point is further in than it was before

Will this matter ? Is it that the old ones have squashed and widened / swollen ?

Bad pic shows two old ones top and new one below

[ Guests cannot view attachments ]

Thanks

Simon

[Bryanj]

Thats just deformed in use mate, make sure the tiny washers gonbetween the spring and O ring

[SPR]

Thats just deformed in use mate, make sure the tiny washers gonbetween the spring and O ring

Brilliant - thanks again

Yep got needle / spring / washer / o ring then screwed in ....

So it won't matter that the screw goes in further to a stop now ... before then winding out

Cheers

Simon