Originally Posted by
Ron
Just in case, it seems you are missing the idea behind the WUR/CPR... if the WUR (and thus engine) is cold, it will lower the control pressure to enrich the fuel and then lean it out to normal operating pressure (50 psi)/fuel ratio as the engine warms up.
If it has been in a heated area, it would start control pressure at a higher rate than 20 psi ie expected/'normal'.
FWIW:
-Mine at 55° F, will start off at ~24 psi and go to the 50 psi quickly ( < minute or so, iirc).
-I would expect it to start at the 40 psi, if it were ~85° F and go to 50 psi within a few seconds.
-Having sat in a heated area at the 65 ° F overnight, I'd expect it to start at ~26° F....that be the case, yours is a little off but it's not that critical, as long as it hits and holds 50 psi when fully warm.
-Again, the engine must not run for hours, preferably sat over night (internal cylinder temp is what matters most, not ambient air), you have one very short time period to check it...
FWIW- I would not mess with the Primary Pressure with it being at 5.0 bar because it is within the "checking value" specs given in the manual at D:02:01 of 4.9-5.5 Bar (71-79psi)....(don't see 0.1 psi off of "setting value" as the problem)
P.S. Dave was saying the CPR;WUR could be bad, not PPR.
P.P.S. IMHO, once you run it around a little with some cleaner in it and fresh plugs, I'd bet the only problem you have (expect possibly a bad WUR, which I would not bet on yet) would be to only see a hunting problem during warm up, which is typical IF your injectors are not flowing exactly the same AT IDLE and/or ALL settings etc correct before adjusting the CO (Dwell) LAST. They are just particularly fussy when cold.
Hope this helps.....