200A and 202 reproduction
frames back
in stock.
Falrunner
I bought a 550b (I think) in 1988.  Worked perfect. Loved it.  Fast forward 20+ years.  Stove was stolen.  Fast forward some more years and I this week bought an un-used USMC issue 550b.  Tried to fire it up and it wont simmer.  Full blast or nothing.  Tried two generators.  Same.  Replaced all the o-rings.  Same.  I’m at a loss of what to do next and would appreciate advice from those that know this stove better than I do.
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Gand28
That just has the knob with Hi/Lo, correct? They are pretty much high. Not an easy simmer stove. 
Greg -- Fiat Lux!
ICCC Member #1273
Seeker of Canadian Nickel!
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Falrunner
Yes, just the one knob, but it behaves like off - high - off as you turn the valve from the locked detent to what should be the high position. My original stove didn’t have the detent, if I’m remembering correctly. 
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zoomkat
It might require a close study of just what components in the fuel delivery line would throttle the generator output as the fuel control knob is adjusted. If the generator has a pricker wire or similar, does it actually engage with the generator orifice hole as the fuel control knob is adjusted?
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Gand28
These little short gens have no wire inside. I would take it all apart and clean it to see it improves. I wouldn’t expect great simmer however. 
Greg -- Fiat Lux!
ICCC Member #1273
Seeker of Canadian Nickel!
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zoomkat
If this a Schrader valve stove and it has no orifice pricker to control generator output, then less than full output will be a challenge to control. I think in a typical Coleman Schrader valve appliance, the Schrader valve is probably full open by the time the fuel control valve is ~30% open. One might experiment with the fuel control valve between 0% and 30% open to find a lower output position for simmering after the stove settles out. If a "sweet spot" for simmering is found, then the position might be marked for future use.
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Falrunner
I dont believe this stove uses the schrader valve.  It has a tapered cone and o-o ring to seal when closed. It also has the pricker wire.  I’ve had it apart twice now. I’m just stumped about how the fuel is being throttled when the valve should be fully open.   I’ll investigate the pricker wire some more. Watching some videos about this model, I see that other units behave quite differently, so something is definately amiss with this oarticular one.  Thank you all for your kind assistance. 
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zoomkat
If you have had the generator off, then it should be apparent if there is a pricker wire that needs to be connected to the valve assembly in some way. Take the generator and push the pricker wire in to the generator and see if the end of the wire sticks out a little from the generator orifice. I think you should see the tip of the wire. If you see the wire, then you might attach the generator to the valve assembly with the generator swung out from the burner assembly. Then look and see if you can see the tip of the wire when the fuel valve is closed. 
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Chucker
The 550b Exponent has the Schrader, the 550b Peak 1 does not, IIRC. The earlier one's would be the gray Peak 1 and the Exponent is copper colored. 

I own three of these and they will simmer very well. I'm thinking it's a gen tip question, clogging since the NIB has had a chance to corrode at the orifice over the years. The replacement gen's age might mean it also could be corroded. If it's newer, then of course it should be fine.
Chuck
"Stop being angry, and forget about getting back at people; do not worry -- it only causes harm." Ps. 37:8
Eye-SEE-C-C Member #1333 -- MilSpecOps #003
"Michigan - from the Ojibwa word “meicigama,” meaning “great water.”
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BradB
Neither the Peak 1 nor the Exponent have a schrader valve. I recently pulled the fuel pickup from both and greased the o rings with moly grease. Not sure if the OP understands the valve. To light you turn the valve knob a bit CCW, just like lefty loosy. Then, after it is warmed up, you reduce flame by continuing to turn CCW. This generator absolutely has the flame control wire. Make sure it is attached to the fitting on the valve or it will not simmer.
Brad
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Chucker
Thank you for the clarification Brad. Obviously I didn't "remember correctly". Happens. 
Chuck
"Stop being angry, and forget about getting back at people; do not worry -- it only causes harm." Ps. 37:8
Eye-SEE-C-C Member #1333 -- MilSpecOps #003
"Michigan - from the Ojibwa word “meicigama,” meaning “great water.”
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