Sophomore Rider
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Post by ilovenxstage on Oct 20, 2013 10:29:38 GMT -5
My NC50 has been sitting for about three weeks and it won't start. I've put fresh fuel in it, premixed 32:1. It's getting fuel, air, spark, and compression, but the most it will do is occasionally backfire. I've tried starting fluid and it does no good.
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Post by tvnacman on Oct 20, 2013 10:48:05 GMT -5
pull the spark plug dump a tea spoon of oil in the hole turn the engine over by hand 3 or 4 times put the spark plug back in and try to start it again . Let us know if that helps .
John
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Post by geo49 on Oct 20, 2013 11:25:08 GMT -5
Check your plug while it's out.
A fresh plug might make it pop a little easier.
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Post by alleyoop on Oct 20, 2013 22:30:30 GMT -5
Check your Air Filter it may be clogged and to much fuel will cause it to backfire.
Alleyoop
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Sophomore Rider
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Post by ilovenxstage on Nov 13, 2013 16:20:19 GMT -5
I finally did a compression check and I was only getting 40psi. I took the top end apart and my piston is fried to a crunchy crisp! There are also deep gouges on both the piston and the cylinder, and both rings are seized in their grooves. Looks like it's time for a rebuild. I've always used good oil, but I think the big bore and the higher flow exhaust were just too much for the stock jetting in the carb and it was running too lean for too long.
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Post by skuttadawg on Nov 14, 2013 0:21:46 GMT -5
Compression should be around 120 PSI on a fresh engine . Yes running too lean ( more so on a 2T ) will fry the piston . Since you have it apart I would spend the extra and get a BBK which will also require upjetting but will put out more power and be more fun to ride . Many 2Ts use Mikuni VM11/22 main jets
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Sophomore Rider
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Posts: 137
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Post by ilovenxstage on Nov 15, 2013 5:35:10 GMT -5
The piston that got cooked was a 70cc that the previous owner had put on, but the carb is original with non-replaceable jets. I had a stock 50cc piston and cylinder that are in fair condition that I put on until I can afford a new BBK, intake manifold, and new carburetor. Its running now, but I do miss the acceleration that I had with the BBK!
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Post by americanpsycho on Dec 1, 2013 15:04:35 GMT -5
Good idea. Buy another kit and create more problems. Some things are meant to be messed with.
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Post by skuttadawg on Dec 5, 2013 0:55:02 GMT -5
If one upgrades to a BBK it is not hard to upjet at all . Glad to hear you got it running again .
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..BAD TO THE BONE..
