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Carb problem

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skyrider
the 900
the 900

Posts : 2334
Location : preston lancs

Re: Carb problem

Post by skyrider on Thu 06 Dec 2018, 7:00 pm

yes the plug should be a nice brown colour if the bike is running well
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GollyGosh
Laser Shark
Laser Shark

Posts : 203
Location : Grimsby, Lincolnshire

Re: Carb problem

Post by GollyGosh on Sat 08 Dec 2018, 4:18 pm

Back in the day when cars had carbs I used Gunsons Colortune plugs to set the mixture.

Gunson Website
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The Hurricane
Squiddy
Squiddy

Posts : 18

Re: Carb problem

Post by The Hurricane on Sat 08 Dec 2018, 6:27 pm

Funny enough I bought a Gunson Colourtune in the week and tried it out on one of my other bikes first and it is a very good piece of kit and gives you a very good idea of what is going on.
I then tried it on my CB 500 and I am 3 turns out on the left hand cylinder and 1 1/4 on the right. So the puzzling thing is why am I still nearly 2 turns out than the other cylinder. The same size pilot jet, no leaks anywhere and everything has been cleaned and blown out. 
If I put the next size pilot jet in the left carb that should then bring the air mixture screw between 1-2 turns out.
Any thoughts anybody on this?
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eternally_troubled
Admin
Admin

Awesome!
Posts : 3974
Location : 'ere be fens. (near Cambridge)

Re: Carb problem

Post by eternally_troubled on Sun 09 Dec 2018, 12:43 pm

I wander if you have an air leak somewhere.  From experience with other bikes, if you have a leaking carb rubber (or similar) it really make adjusting the carbs difficult, if not impossible.  It certainly stops things making sense...
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The Hurricane
Squiddy
Squiddy

Posts : 18

Re: Carb problem

Post by The Hurricane on Sun 09 Dec 2018, 9:41 pm

Funny you should post this one, as I checked the bike when it was running and sprayed some brake cleaner around the inlet rubbers air box end and they were leaking and I may have another leak on the side of the carb. 
Are there any o'rings on the butterfly shafts towards the outside of the carb on both sides? The screws on the butterfly's are very tight and I don't want mince them up. I would think there would be some o'rings in there but Honda parts list doesn't show any o'rings there.
I have taken the carbs apart to replace everything that needs replacing.
The parts I need are inlet rubbers, two o'ring for the breather tube and maybe two butterfly shaft o'rings. If it comes to it I will drill out the screws holding the butterfly's on.
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ANDYC
the 900
the 900

Mechanic
Posts : 1008
Location : Windsor

Re: Carb problem

Post by ANDYC on Sun 09 Dec 2018, 11:23 pm

There's no 'O' rings on the butterfly shaft.
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The Hurricane
Squiddy
Squiddy

Posts : 18

Re: Carb problem

Post by The Hurricane on Tue 11 Dec 2018, 7:21 pm

Good news there are no o'rings on the butterfly shafts. Waiting for the breather tube and fuel feed tube o'rings from Japan to arrive and can then put the carb back together. I will post a reply to how things go.

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Re: Carb problem

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