Cam timing checked

[Gixer_fan]

Hello all, just checked cam timing - 1.6 K series with SS spec:
Found inlet with 0.60mm lift and exhaust with 1.65mm lift at TDC. So I reckon the inlet and exhaust timing is retarded approx 10deg and 4deg respectively. I'd say my measurements were accurate to within 50microns. I've seen that the correct spec is 1.52 and 1.25mm lift respectively for inlet and exhaust at TDC.
Is this a significant timing error - enough to merit a change to vernier pullies?
(Feel free to call me an anorak!) Thanks

[DVandrews]

It's not uncmmon to find SS cams badly retarded, to be honest yours is one of the better ones, the worst I have seen is 12 thou (0.3mm) LATDC on the inlet and 90 thou (2.25mm) on the exhaust which is a country mile out.

Definitely fit verniers and adjust., I would try 70/60 (1.75mm/1.5mm) lift at TDC.

Dave

Edited by DVandrews on Saturday 20th December 21:44

[Gixer_fan]

Thanks for that Dave. Just on fitting new pullies, there aren't any flats on the cams to lock them - just a raised bridge on one side which doesn't look suitable. Do I use the old belt in place, or a cam locking tool between the pullies to allow undoing of the bolts? The aluminium locking tool fit is sloppy (I could pack it out with tape) but worried about damaging the pully grooves. I see the pully bolt is torqued to 28lbft.

[DVandrews]

Use a cam lock tool, even if it is a sloppy fit, there is zero danger of damage to the pullies, the pulley bolts should be tightened to 65nm.

Dave

[Gixer_fan]

Many thanks Dave - much appreciated!