Hi Malcom,

The idle mixture settings are the four screws on the top of the carbs,
furthest towards the engine. Stock settings are at 1.5 turns from lightly
seated (in).

To properly tune these, I believe that you'll need an exhaust gas
analyser, though you can tune them by ear/RPM.

You'll be tuning the idle for the smoothest running/highest RPM. To tune,
turning the screws out makes the mixture richer, in is leaner. You may
need to turn each one out from stock (making note of how far out you've
turned it) if you've got any inlet/exhaust mods.

What you should do, is make note of where they are now, counting the
number of turns until they're seated. Set them to the stock position,
then turn each one out (making note of the number of turns) until the revs
peak, then drop off. Turn the screw back in until the revs peak again.
Re-set the idle after you've done each cylinder.

This may also help you with fault finding:
http://www.factorypro.com/tech/carbtune,CV,lower_rpm_engines.html

On a side note, do you still have the body of your GS250FW (minus
engine/electrics of course)? And would you be willing to part with it?


Let us know how you go, and do you have any pictures of your kart?


Cheers,


Carl

>
> Hi Carl
>
> I have not tried any different mixtures. I have the choke connected and
> when cold will only start with it and takes a while to get going. Once
> going and warm seems to idle fine.
>
> I will check out the float level diagrams and as for the mixture settings,
> I don't have a clue so if it comes down to that I'll have to find a good
> motorbike mech in melbourne.
>
> Thanks
>
> I'll let you know how I go.
>
> Malcolm
>
>
>
>
> Carl Johnston <cjohnston@...> wrote:
> Hi Malcom,
>
> I'm having a similar problem with mine (though I haven't got the time to
> work it out - I think it's fuel related) - mine will rev past 6k, though
> between 5.5k and 7k it's a real dog, only to pick up really nicely.
>
> I wouldn't know about the ignitor, I'd be asking the wrecker about this.
>
> Are you getting good spark? Have you got the enricher (choke) connected
> and working correctly? Have you adjusted the pilot air jets (mixtures)?
>
> Have you downloaded the workshop manual?
>
> The float levels are measured from the carb-body surface (the majority of
> the flat section under the carb-body [not the raised sections]) to the
> highest point on the float. The float has to be just touching the needle,
> not putting pressure on it.
>
> If you grab the workshop manual, there's a (reasonably) good diagram for
> measuring float levels. If you still can't work it out, go download the
> workshop manual for the GSX250F (Across), as they're really similar, and
> the diagrams are much better.
>
>
> Cheers,
>
>
> Carl
>
>>
>>
>> I am still have ing trouble starting. and when running very slow to
>> rev up to a maximum of about 6000RPM.
>>
>> I have noticed that the igniter the wreakers gave me is from a GSX
>> 750. Could this be a issue?
>>
>> I checked the timing last night it is fine.
>>
>> I tried to check the float levels and I am unsure to where I am to
>> measure from.
>>
>> If anyone can help me out it would be fantastic.
>>
>> Malcolm
>>
>>
>>
>>
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
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