How to change the piezo igniter on a Jetboil Flash

Disclaimer:The guide below is based on my own experience of performing this task. I am not an engineer, nor do I claim this to be an approved method of performing this task. Anybody following this guide does so at their own risk, and at risk of invalidating the warranty of their product/s

I love my Jetboil. I have both the Flash and the Sumo, and they are fantastic stoves – as long all you need is a simple way of boiling water or heating meal pouches quickly and for the cooking system to pack away into a small bundle. The only criticism I have is that the piezo push-igniter can be a little temperamental after extended use, and will probably stop working altogether eventually for most users. I got into the habit of carrying a ferrocerium rod or lighter around with me when carrying the Jetboil, which wasn’t ideal.

I eventually found a replacement piezo at the Cotswold Outdoor store in Betws y Coed. As always, I find the staff at this particular store extremely helpful and knowledgable! Whilst working out how to replace the igniter unit I thought it would be worthwhile taking some photos and making this into a tutorial blog post…

A word of warning here – there are two type of spare igniter available for the Jetboil: the older type for the PCS/GCS and newer type for the Flash/Sumo/Zip etc. They look similar, but the one for the Flash has a flexible white wire instead of a stiff ceramic tube.

Step 1 – Disassemble Burner

The burner assembly has two main halves – a metal ring with attached burner, and plastic lower moulding with gas control valve and igniter housing.

jetboil burner

Plastic lower housing and metal upper ring

Note the three plastic locating lugs, one of which is shaped differently, to act as a key when reassembling the two halves.
Plastic mounting lugs and burner

Plastic mounting lugs and burner

The burner (make sure it is cold and disconnected from gas canister!!) can be pushed down and rotated in an anti-clockwise direction (grip plastic housing securely). The burner will separate from the lower control valve (the connector is a little like a bayonet light bulb fitting)and then the plastic upper ring will come away from the lower plastic housing.
Upper burner locating lug

Upper burner locating lug

The white/grey wire will then hopefully slide out of the ceramic tube that runs through the burner unit.

Step 2 – Remove old igniter

The old igniter cable will probably be quite brittle, so take care. You may need the old cable to calculate the length of the replacement one.

Comparing old and new igniters

Comparing old and new igniters

The control valve is a friction-fit in the lower plastic housing, and should drop out with a gentle tap. If your burner unit is anything like mine then you will probably notice a lot of dust, sand and other crud in places it probably shouldn’t be. A few years of mountaineering, canoe and expedition adventures have taken their toll! I cleaned out the crevices with an air-blower I use for cleaning my camera lenses, but a gentle blow should do.
Remove and clean gas control valve

Remove and clean gas control valve

Step 3 – Prepare and fit new igniter

The new igniter will have an insulating sheath all the way to the end, unlike the one you have just removed. I laid them side by side an calculated how much insulating sheath to remove. The sheathing can be removed carefully with a sharp knife, but be very careful not to nick or damage the wire underneath.
Fit the igniter module in the plastic housing, ensuring there is a positive ‘click’ from the two plastic retaining clips.

Locating new igniter in lower housing

Locating new igniter in lower housing

Step 4 – Reassemble unit

Once you have stripped the wire, inserted the new igniter and cleaned out any crud then gently thread the wire up the ceramic tube in the burner.

Carefully thread wire

Carefully thread wire

Insert the gas control valve back into the plastic housing and then line up the three plastic locating lugs on the upper metal ring. Finally, line up the burner on the control valve, press down gently and turn clockwise. The burner should push it slightly at one particular point, and then lock together. This took me a couple of attempts to get it located properly.
Finally, bend over the top 4mm or so of the exposed wire end so it just overhangs the edge of the ceramic tube. By bending the white wire as it exits the ceramic tube underneath you can make sure this doesn’t move around too much. Make sure no exposed parts of the wire touch any of the metal parts of the burner – the way it works relies on there being a gap between the end of the wire and the surface of the burner.
Make sure there is a gap between burner and wire

Make sure there is a gap between burner and wire

Step 5 – Test ignite

If you now press the igniter you should see that familiar blue spark that shows it is working properly. Then attach a canister and test ignite.

Test ignite

Test ignite

If you smell gas, hear anything unusual or cannot ignite despite there being a spark then stop, take it to a well-ventilated area and remove the canister (away from any other sources of ignition – gas canisters can have a habit of releasing gas after disconnecting them!). Then take the whole thing apart and see what went wrong!

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  1. Hi,had an interesting weekend in lakes set up jetboil sumo with newly bought jetboil canister from Blacks only for it to be up in flames, regulator woulnt work to turn off so now 1 ruined burner…can I complain to blacks ask for new sumo/burner or do i have to go back to jetboil
    hope i dont have to buy new igniter!

  2. After taking the burner apart I found that there was enough slack in the wire to push it further up the ceramic insulator and to bend it over t make a great connection . Cost £0.00. Result.

    • Glad that worked out for you – in my case though it was a complete and utter mechanical failure of the igniter itself, not the wire.

      • I attempted to repair my Flash by pulling the wire through previously, which didn’t work. I came across your article whilst having a renewed attempt to find a replacement piezo online.

        In my view, the piezo from an electric lighter would fit just fine. Was yours a Jetboil branded replacement (which I can’t find anywhere), or was it just a non-brand piezo?


        • It was a Jetboil spare part. You’re right, a piezo igniter of the right size should work – but with the igniter I replaced it wasn’t the piezo that failed but the button mechanism.

  3. You beauty. Yep, pulled a bit more through, cleaned the wire up, new bend in the end now every one is a winner. Figured I’d end up needing a new burner head, but no. £0.00 and may favourite stove is back in action.

  4. Hi I have the jetboil flash. I tried to turn it as described but it doesn’t come loose. Do I have to remove the circling clip first?

  5. Another “pulled a bit more through” but only with your help.
    Also hadn’t appreciated how critical the spark gap is. Mine had previously been too short which made lighting a bit hit and miss.
    Many thanks for the comprehensive article.

  6. Thanks for your step by step. I mistakenly received a rigid ignitor for another type of jetboil that seems to be more popular for places to stock. After looking at your instructions I realized I could lengthen my ignitor as it was too short and the blue spark would go to the outside of the burner and not ignite the fuel. Works great now.

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