F2000 craps out again... Angle Of Engagement?

[Adolf Hamster]

hmm, that's not the type that i was thinking of (the one i had was obviously textured) might be worth checking the rear of the track anyway make sure it's clean and smooth.

same goes for the cylinder/cylinder head combo, nothing wrong with that on paper (even matching brands which isn't even strictly necessary)

you can split the compression check to see which component it is.

piston+cylinder (use the palm of your hand over the end, you'll feel if air's leaking past your hand)

once you know the pistons good just add the cylinder head and check, then if that's good add the nozzle.

i'm thinking atm either piston o-ring or perhaps the nozzle-cylinder head (sometimes they can be off on size)

 

[ak2m4]

@RostokMcSpoons cylinder internal diameter varies quite a bit, from 23.6mm to 24mm.  Recheck the seals on yours. Most problems stem from the piston head o-ring either isn't big enough or something is blocking the vents (not allowing the oring to be pushing out).  A BS910 o-ring is slightly larger so grab one of those.

The o-ring on the nozzle might make a small amount of difference but in my experience doesn't affect fps greatly, it's more there to keep the nozzle centered.  

 

[Rogerborg]

A BS910 o-ring is slightly larger so grab one of those

Oh, that's handy.  19.18mm + 2 x 2.46mm = 24.1mm. ?

I've been getting on OK with generic 19mm / 2.5mm = 24.0mm o-rings, stretched out by popping them over the cylinder and then heating them a bit - you know, a fire-based ritual ceremony.