Posted January 15, 200718 yr Hi guys can anyone tell me the correct way to adjust the power valve on my 1989 dtr125
January 16, 200718 yr Author The 89 uses a static powervalve so you needn't touch it except for decoking. sorry about that it is a 1998 model with a servo motor i think i'm suffering from fat finger syndrome pressing the wrong keys lol
January 17, 200718 yr Lol ok. In that case you need to whip off the front pipe and get your finger up the exhaust port to feel the position of the valve. Switch on the ignition and you'll feel it centre which is when you can ascertain whether it is set correctly or not. If it's correctly set it should feel flush and the valve is flat although they sometimes restricted them by turning the valve over by 180 degrees which meant it effectively never opened. You'll know if it has been swivelled because the face of the valve wont feel flat. Assuming it needs to be rotated 180 then you have to get the casing and pulley off of the valve and then use pliers to spin it over. Refit pulleys and casing and then use the cables to reset the position of the valve and keep switching the ignition on and off to make sure you get it perfectly centred. When it's centred properly the whole exhaust port will feel smooth as the valve will sit flush when it's in it's open position.
January 17, 200718 yr Author Lol ok. In that case you need to whip off the front pipe and get your finger up the exhaust port to feel the position of the valve. Switch on the ignition and you'll feel it centre which is when you can ascertain whether it is set correctly or not. If it's correctly set it should feel flush and the valve is flat although they sometimes restricted them by turning the valve over by 180 degrees which meant it effectively never opened. You'll know if it has been swivelled because the face of the valve wont feel flat. Assuming it needs to be rotated 180 then you have to get the casing and pulley off of the valve and then use pliers to spin it over. Refit pulleys and casing and then use the cables to reset the position of the valve and keep switching the ignition on and off to make sure you get it perfectly centred. When it's centred properly the whole exhaust port will feel smooth as the valve will sit flush when it's in it's open position. Thanks for that i'll give that a go
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