A commonly asked question these days is, "How can I get my car to pass its emissions test?"  A few tips have kindly been supplied by Ken Gillanders of British Frame & Engine.  Although specifically for TR250/TR6, the principles apply generally.

1. Change oil using 20W-50W.

2. Use new spark plugs, gapped to 0.032" (standard is 0.025").

3. Use new solid-core ignition wire (not carbon core wire).

4. Lossen valve clearances .005" from standard.

5. Ensure all smog equipment is present and working properly.

6. Retard ignition timing about 3 degrees.

7. Adjust carbs lean - engine should die when carb piston is lifted 1/32" - 1/16".

8. Ensure that the engine is at full operating temperature for the test.

9. Use low-restriction air filters - wire mesh types are great for this.

10. Run your fuel level down as far as possible and refill just before the test.