I have an old (at least 30 years old) Shindaiwa 25 weedeater and I need to know the gas/oil mixture.
Thank you

Probably 50:1 or 40:1, if nothing else, go with 50:1 because too much oil is better than not enough oil. And excess oil will just make it smoke a little more.

I got my shindaiwa model 25 in 1982 it is still running today this was shindaiwa commercial model it came new with the string head and a saw blade,the gas to oil is 25 to 1 in case you do not know this the end the string head is on will come off and you put grease in that end you should make shure it is full of grease..

WHAT?! MOWERMAN2468 is crazy;40 TO 1 MEANS 40 PARTS OF GAS AND I PART OF OIL!!
25 to 1 IS TOOOO MUCH OIL; THE BEST MIX IS 35 TO 1 [AGAIN] 35 PARTS OF GAS AND I PART OF OIL;try & check the spark plug!!

What's crazy is your committing on a post that's over 3 years old .

Hi,I notice the date after sent the answer,and hope help to any person who need to understand the mix,but now I notice that I found more than one crazy & stupid in this forum,because I only try to help;Thanks.

Bawhahahahahahahahaha..

And I check now,and is only ONE YEAR OLD!! [Thu, 07 Oct 2010 02:49 pm]I HOPE YOU LEARN SOMETHING TOOOOO; Bawhahahahahahahahaha..

Does not matter just having some fun , have a good one .
Luck