Thread: 951di 2002 running rich??
07-24-2013, 02:43 PM #1
951di 2002 running rich??
Hi all. I've put new plugs in my gtx di today. After a first day out today I've checked the plugs and they are both a bit sooty and black. Any suggestions or ideas about it?
07-24-2013, 08:55 PM #2
Check the oil pump. It could be adjusted a bit rich therefore making your plugs black.
07-25-2013, 05:11 AM #3
07-25-2013, 03:01 PM #4
get a mirror and look under the exhaust at the front of the engine. You should see a pump that moves when you apply the throttle. See if the marks on the arm that is moving is lined up with the mark on the pump when you are at zero throttle.
07-26-2013, 02:18 PM #5
07-26-2013, 06:56 PM #6
The alignment marks need to be lined up.
You cant adjust the idle on a DI so you only need to set it properly when the engine is not running
Loosen jam nut and turn cable adjustment nut to
obtain the pump mark alignment.
The adjustment is located under the throttle body
I dont think the slight misalignment is causing the plugs to be sooty, What grade of fuel are you using ? is it old fuel ? what type of oil and the brand are you using ?
Last edited by SURFnTURF; 07-26-2013 at 07:27 PM.
07-27-2013, 06:48 AM #7
07-27-2013, 06:49 AM #8
07-27-2013, 07:55 AM #9
You can see from the pics of the oil pump that it is set close to the rich mark. The first pic is the one that tells the story. Anywhere between those two marks at idle is correct. BE CAREFUL!!!! Do not dial it back to the first line all at once if you have your mind set on dialing it down to try and get some of that color out of the plugs.
I would suggest adjust it to the middle of the two marks at idle if you REALLY want to make a adjustment. Then check your plugs again. Only if you really want to mess with it.
DI's run real hot because they do not burn much fuel. Fuel acts as a lubricant inside your cylinders. Regular carbed engines use more fuel and spit excess out of the exhaust. That helps in cooling but does not do too much good for the lakes.
I like to run mine a bit rich too just to make sure that I don't go to far and have a issue with burning a piston.
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