OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Trimmers and Brushcutters Homelite Trimmers & Brushcutters homelite st 155

the spark plug of my st 155 is always light grey almost
white i use husqvana oil mixed at 50:1 and the H needle set
to where it four stroking no load would it be better to
use nomal two stoke oil and mix it at homelites recomended
32:1 or may be 25:1? also on carb setting if i close
the H needle to where i hear the revs drop how far should
i open it from that point, thanks for your help in the
past bruce,
tommy.
ireland

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Tommy,
I would be using the 32:1 or 25:1 which is recommended by Homlite. As to the mixture of the H & L needle the procedure is that you set the L first then H last. When setting the H you bring it to when the machine peaks then back off 1/8 th of a turn.

Also check your cylinder for light scoring because if you have been using a 50:1 mix it might be to light and caused the cylinder to be damaged.

Regards,

Bruce

thanks bruce ill switch to a 25:1 mix. as to where it peaks
is that at a point where the revs start to drop please explain,
tommy

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Tommy,
That is when it is running at its fastest speed otherwise it will be running too lean.

Regards,

Bruce

thanks bruce i have have a tach so i just close the H needle
watch the tach for the highest rpm then open it 1/8 of a turn
and if it were a chainsaw the same but open the H needle
1/4 of turn?
tommy

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with regard to homelites 32:1 ratio i seen on one reply
where you said you could use 50:1 depending on
oil i tought husky oil should be ok in anything if
you go by its recomended ratio on the container
the other oil ihave is finol fina mix its a semi synthetic oli maybe
you never come across it i would mix that 32:1 any toughts?
tommy

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Tommy,
Their is confusion as to what rate you can mix oil at but you have to follow what the manufacturer recommends as the oil companies will revert back to the manufacturer. That is why I now use manufacturers rates not oil companies.

Regards,

Bruce