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SOHC.co.uk Forums => CB500/550 => Topic started by: paul G on September 28, 2013, 01:16:48 AM

Title: K3 mixture with motad
Post by: paul G on September 28, 2013, 01:16:48 AM

Hi all,
Just started the K3 for the first time after restoration. It is running very lean with a motad exhaust does anyone have the jetting for this set up.
Can I lift the needles one notch or does it need re jetting.
 

Title: Re: K3 mixture with motad
Post by: UK Pete on September 28, 2013, 09:00:18 AM

Just from lots of previous experience with motads , i have never had to re-jet, are you sure the carbs are all set correct with standard jets, and are totally clean
pete

Title: Re: K3 mixture with motad
Post by: mickwinf on September 28, 2013, 09:12:33 AM

I agree with Pete, rejetting is not normally required, but carb problems are very common often taking several stripdowns and lots of trial and error with settings. The K3 especially as I believe they were set quite lean to start with, so good luck!

Title: Re: K3 mixture with motad
Post by: paul G on September 30, 2013, 12:05:31 PM

Thanks,
I will check the float levels again. The carbs were thoroughly cleaned before installing them.

Regards,

Title: Re: K3 mixture with motad
Post by: mickwinf on September 30, 2013, 09:17:58 PM

just be aware the K3 has a different float level to the earlier model at 14.5 mm

Title: Re: K3 mixture with motad
Post by: paul G on October 01, 2013, 08:20:59 AM

Thanks for the info.
Where is the measurement taken from I am guessing it is the far edge away from the valve !

Regards,

Title: Re: K3 mixture with motad
Post by: Piki on October 01, 2013, 10:18:47 AM

Check what model the carbs are fit on your bike!!! I bought one 550 K3 with 550 Four Carbs!!! is very common it!!! 069 A Model-550 Four, PD46A-550K3!!!

Title: Re: K3 mixture with motad
Post by: LesterPiglet on October 04, 2013, 10:38:02 PM

My F2 has a Motad, no re-jetting. I don't have PD carbs though, if that makes a difference. I know PD's were leaned out to meet US emissions.

Title: Re: K3 mixture with motad
Post by: paul G on October 06, 2013, 08:54:17 AM

Hi,
        I have PD carbs. Does anyone know the jet sizes and needle settings for a 77 K3 .
I have the manual but this does not give them for a K3
Is the float height 14.4 for these carbs.
Thanks

Title: Re: K3 mixture with motad
Post by: mickwinf on October 06, 2013, 09:10:11 AM

Hi Paul 550 k3 settings are (from Honda k3 supplement) main jet 90, air jet 130, slow jet 38, slow air jet 150, jet needle 3rd groove, float height 14.5mm. If you let me have your email address I can send a copy, it has all the info on differences of k3 model, regards Mick

Title: Re: K3 mixture with motad
Post by: paul G on October 07, 2013, 12:14:14 PM

Thanks for the info Mick