My first seize!

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jeffp83

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The dents on top of the piston are from the hammer job I had to do to get it out of the cylinder lol.
 

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That's not from running the tank dry. You have/had other problems that caused the seizure. I run 50:1 and I've ran out of fuel at full throttle many times and never had a problem. What does the plug look like?
 
Plug indicated a lean setting, which I thought was because of the tank drying up. This was after about 40 minutes of full throttle runs in 30+C weather.
 
Hmmm... was I running too lean or was it the darksoul/marine setup running too hot? I figured it was because I was doing 16+k on fumes lol. I've never blown a 2-stroke before.
 
Too lean man. I run my tanks dry every outing. I don't like to leave fuel in them.

Sorry. I guess you have a good reason to upgrade.
 
Ok thanks guys. I just figured i ran it out and it burned up. It was running the same way for ages.
 
jeffp83 said:
Hmmm... was I running too lean or was it the darksoul/marine setup running too hot? I figured it was because I was doing 16+k on fumes lol. I've never blown a 2-stroke before.
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That could have been a contributing factor. The DS heads are known to run a tad on the warm side.
 
I noticed the ds marine setup always ran hot but never ran into a problem until now.I did read some stuff about them not lasting long though. Anyways, i will put the blame on myself. I was thinking about going to a 4 bolt.
 
I did use thermal paste but there is a big enough gap between the heatsink and the cylinder that it wouldn't do anything at all.
 
that looks like a heat seziure to me, seen pistons and barrels go like that many times on MX bikes on very hot track days.(common problem my honda cr125, i need bigger rads on tht bike, or i got a blockage i cba to sort)

and if you was running lean aswell, well..... :)
 
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I checked the settings on my carb (668) after I got it apart... just over 1.5 on the high and 1.25 on the low. I think that's around stock settings?
 
Yeah, that is the base setting which should be rich. Air leaks can also cause a lean seize.
 
Trip.. said:
Carb settings mean very little. You could have the needles out 3 turns but if you have an air leak, it will still run lean.
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True... i'm kind of scratching my head now as to what happened. I am for sure that I didn't have an airleak as I know what the engine sounds like when that happens. Going to grab a new carb as well, just in case. Maybe I will just go back to nitro, this may sound crazy but i've had less problems with those little engines than I have had with gas (plating failures, gasket blowouts, bad bearings and now a seize) lol.
 
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