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Post by sandpiper on Apr 6, 2016 9:27:23 GMT 1
hi guys i know its not a yam but at least its a 2 stroke ! got a honda nsr125r was running fine then all of a sudden it started to back fire and wont stop back firing, took carb off stripped and ultrasonically cleaned, changed plug, checked for air leaks all ok, any one out there had this or know why a 2 stroke keeps backfiring any advice would be much appreciated before i go mad.
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Deleted
Deleted Member
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Post by Deleted on Apr 6, 2016 11:08:12 GMT 1
ignition timing?
unburnt fuel igniting in the header pipe?
just two thoughts
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Post by KevtheRev on Apr 6, 2016 11:16:46 GMT 1
Does it run , or is it backfiring as you try to start it ?
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Post by muttsnuts on Apr 6, 2016 12:58:45 GMT 1
sounds like igniiton issues
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Post by unrealedd on Apr 6, 2016 13:20:36 GMT 1
Check for sheered off woodruff key. But as said timing issues.
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Post by sandpiper on Apr 6, 2016 13:45:55 GMT 1
hi guys thanks for responses, it does start but pops and bangs and it wont rev out ??
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Post by bare on Apr 6, 2016 18:38:08 GMT 1
Going to actually have to open the contraption up... then start measuring/checking to find/fix the problem :-)_
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Post by muttsnuts on Apr 7, 2016 14:04:28 GMT 1
hi guys thanks for responses, it does start but pops and bangs and it wont rev out ?? sounds like stator coils for low/high ignition and/or pickup, test them with a multi-meter, values should be available on the net for that model |
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Post by wonkywheel on Apr 7, 2016 19:57:06 GMT 1
Hi, As said probably ignition issues. However, I had similar problems with an LC 125- I flitted a new carb kit- and it fixed the problem. No back fire and reved out well!  Then I went for a ride-and the poor little single limped home with enough smoke and steam coming out my exhaust to smoke an entire shoal of kippers.  Deeper issues- knackered engine in the biggest possible way- although at least it never backfired when it limped home! I'm not suggesting yours is knackered- yet carbs are funny things especially if the pilot jet is blocked. Hope you sort it. |
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