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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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  #1  
Old 03-10-2019, 03:08 AM
julian5000 julian5000 is offline
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Unhappy 2011 EC250 Won't Start After Rebuild

Hi All

So I've just rebuilt my 2011 EC250. Apart a stubborn gasket supplier who insisted gaskets for 2002 - 2011 are all the same, it all went pretty well.

Until I tried to start it. It's had nearly everything new, crank bearings, seals, conrod, piston, re-coated cylinder etc.

This is what it sounds like when I try to start, just nothing there at all.

https://youtu.be/D5_LoQ485ZM


I also re-did quite a bit of the dogdy wiring, so I was concerned about that, but the spark looks ok:

https://youtu.be/CnPv9xeM_gQ

I haven't touched the carb, it seems to be getting fuel as the plug was wet.

It's been a long day so it's probably something simple, but I can't help thinking it's something deeper that I fecked up..... Spark + Fuel + Compression = Bang Bang right?

Any ideas welcome, thanks in advance.


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Old 03-10-2019, 07:22 AM
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Zman Zman is offline
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1. Do you have a good spark?
2. What is your plug gap?
3. Does it have good compression?
4. Were the crank seals bad before? If the bike had bad crank seals or another air leak it may have been jetted to compensate. If so it could be way rich.

Maybe install a new dry plug and try to start it without the choke?
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Old 03-10-2019, 01:20 PM
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Plug that sparks on the outside doesn't always work under pressure.
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Old 03-10-2019, 02:14 PM
julian5000 julian5000 is offline
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Thanks guys. I tried again this morning with it all dried out, no choke and it fired up. Zman seems you were on the money. Must be too rich now the crank seals are fresh.
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Old 03-10-2019, 02:49 PM
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barossi73 barossi73 is offline
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If bike has been down awhile try fresh fuel.
Generous use of oil on reassembly can make the initial starting harder too.
It may respond differently to how much choke it requires,you may have just flooded it whilst clearing out the startup oil.
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Old 03-10-2019, 05:52 PM
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Quote:
Originally Posted by barossi73 View Post
If bike has been down awhile try fresh fuel.
Generous use of oil on reassembly can make the initial starting harder too.
It may respond differently to how much choke it requires,you may have just flooded it whilst clearing out the startup oil.
This was my thought. Assembly lube/oil causing some fouling and flooding.

From the video can hear it has good compression, just not firing up. I would have held the throttle open for a bit as well to clear any flooding out.

I rebuilt an engine for (with) a mate once. For whatever reason (I think he forgot to bring the stator side seal).. anyway he took the engine home and just needed to fit the seal and stator. When he finally got it back in the bike it was surging and wouldn't idle well at all. Upon investigation he forgot to put the seal in entirely!! Amazed that it even started.. and lucky that it never seized.
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Old 03-10-2019, 06:21 PM
julian5000 julian5000 is offline
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Yeah seems it was just flooded and possibly a bit rich now with the fresh seals. In hindsight things were pretty wet so it makes sense.

Nothing like walking away for a while. Had been a long day putting it back together and making a new loom.



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