Date registered: Jun 2005
Vehicle: 72 250 M130 W114
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RE: More Adjusting Solex & Timing.
the 1 1/2 turns are an initial setting. Then you need to dial them in.
There are many ways of doing that. the traditional half way between the 2 rough ends.
Using a color-tune to look at the color of the cylinder.
And my favorite of using a vacuum gauge. Adjust the screw until it reads the highest vacuum.
Sounds like you need new adjustment screws. My understanding is they erode over time.
You don't mention what you initialy set the timing at and how (rpm, vacuum...)
Also the timing chain sometimes slips. have you verified all the timing marks?