Refurbishing a Primus Gravity MF II stove

I recently had some trouble with my Gravity II MF, where it was burning with a very yellow flame on white spirits, but seemed ok on gas.  I stripped and cleaned everything, but apart from further damaging the pathetic screw that holds the top together nothing changed.

The original screw

The original screw (my camera sucks at macro)


Note how the screw has naturally become bent, and removing it damages the soft metal head, even when using the correct screw driver. I have seen this problem on quite a few of these stoves owned by others as well. I tried to repair the thread but it was too damaged.

Next I tried a range of different jet sizes (I have 26 35 40 42 and 45) but all exhibited the same problem.  After some time I decided to remove the filter in the end of the pump, which improved the pressure quite a bit but unfortunately still an annoying yellow flame.   At this point I was starting to go a bit mental with frustration, but eventually on a whim I took off the protective mesh that covers the air intake near the jet, and to my amazement it started to burn with a sexy blue flame with no yellow at all!

The jet housing with mesh cover removed

The jet housing with mesh cover removed

I didn't see any reason to reinstate this mesh so I have left it off and I feel like I have acquired a brand new stove! I went down to the hardware store, they didn't have a M3 countersunk screw so I bought a regular round head one, then cut it to length. I also ran an M3 tap into the stove to remove any soot/rust and the new screw fits perfectly!

New screw

New screw

New screw installed

New screw installed

| January 31st, 2016 | Posted in Hidden |

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