Re: Super Tigre Carb Tuning

Like you, several years ago I went NUTS trying to get a ST to run right. 
Here is what I learned the hard way:

DON'T MESS WITH THE SPRAYBAR POSITION FRO THE FACTORY!

The secret to getting an ST to run right is as follows:

1.Start and adjust for high end mixture. Stop engine.

2. Connect a piece of fuel line to the carb that is long enough you can
put 
the other end in your mouth to blow through.

3. CLOSE the idle mixture needle.

4. While blowing into the fuel line, open the idle needle until you can
JUST 
hear air coming through.

5. reconnect fuel line and start engine. Adjust high end needle again.

You are done.

This will normally set up the carb nearly perfectly and allow transition 
from low to high throttle without the 'stumble'.

Good luck!

"Mark Eastman" <rcflyer620@[EMAIL PROTECTED]
> wrote in message 
news:8fe1bf5d-4d39-43ca-b71b-851ed88b86f5@[EMAIL PROTECTED]
> On Jun 30, 6:57 pm, Ted <tkenned...@[EMAIL PROTECTED]
> wrote:
>> I am having a bit of a problem getting my ST 51 to run smoothly. I
>> have had STs before so I know you have a delicate balance between the
>> low end and high end before you get it just right. I recall reading
>> somewhere that the position of the spray bar is very critical as well.
>> Has anyone also heard of this? And what position would be ideal? Most
>> engines like it pointed straight down but I seem to think the STs
>> prefer a little upward thrust of the spray so if you are looking from
>> the needle valve side it would be pointed around 4 o'clock. Any
>> thoughts or experience on this? Many thanks.
>>
>> Ted
>
> Start with the spray bar straight. It may take a tiny twist later but
> that is usually your last resort.
> The most im****tant thing you can do, in particular with the ST51, is
> switch to an OS-8 glow plug. The ST plugs are basically junk.
> I fought with my ST51 for months before I came to that simple
> solution. It simply wouldn't mid-range well.
> Now it runs great, hardly ever needs adjustment, and starts easily.
>
> Good luck,
>  --Mark