450 psi would be considered fairly "normal" although this is not a spec nor a procedure proferred by Lister for these machines. We sometimes get down to this if we have a balking engine that we cannot get an accurate diagnosis from the usual crankcase vacuum measurement. (i.e. the engine just cannot be started). What you are actually looking for is consistent even compression across all cylinders. 350 psi may be considered enough on one of these very small engines. You cannot test through an injector. Use an adapter made for the purpose.

Injectors should be bench tested for pop pressure, spray pattern, seal and consistency across cylinders. They can be installed inverted onto your engine if you want to confirm fuel pump operation as well, just cannot see as many details when doing it that way.

The leak-off line from top of injector allows the system to be somewhat self-purging of air in the lines. With a new tight perfect injector there may be no fuel bypass at all... with others there may be considerable, but that generally means that there is internal leakage within the injector body. Some CS models actually used a small open container to catch the very slight drip from the injector leak-off. Newer fuel systems route this back into the fuel supply tank or back into the secondary fuel filter as in your SR.

dieselgman

First of, the gearbox motor with raised starter setup.
First i bled the fuel system from filter to pumps, though not on the injection pipes. I filled both cups half full of motor oil and cranked before attempting to start it. After several sweaty attemps I filled the cups half with twostroke premix and this fired it up. I has no exhaust manifold and looks like i has quite som residue buildup in the exhaust channel. Also when it ran, it was making a lot of sparks out the exhaust - like fireworks, so I guess the inside of the engine is in need of a decarbonizing at least. I tried to start it again today, but it would not fire. I'll have a look at valve clearance and injectors before I decide to take it apart.

Greetings. I have this very nice Lister-Petter HR2 sitting in my barn. As far as I understand it is a
HR2
CCW rotating
Built in 1990
Number 95 produced that year.
I read somewhere that the numbering system was changed in the eighties, so I am in doubt if it is correct.
What does 910 stand for? 
The engine plate reads
4000095HR2A910

Thanks
(It starts very easily and sounds so beefy – waiting for oil and filters before running it again)

Hi Chris and welcome to the Forum the numbers you have posted of 202 50012 would only be a casting number for that component and not the engine number which is what will be needed to date the engines.
As sirpedrosa has posted there should be a id plate ivetted to the engine block and most likely near the fuel pump. If you do find this then be very careful in removing any paint from the plate. The  numbers will be stamped into the plate but the writing telling you the details will be painted in black paint usually. Details on the plate will tell you engine number, model, hp and RPM. Engine number is what is required to date the engine/s.

Thanks.

I removed the electric starter and the gearbox and handcranked it to life, but definitely not an easy starter, but ran ok on both cylinders once it was running.

Do you have any comment on the one with the portuguese engine ID?