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Post by grimesy on May 31, 2023 20:16:43 GMT 1
Hi everyone,
Looking for advise, my LC350 4LO has just had engine rebuild but has a noise which I can't identify..the bike starts and runs on both cylinders no probs and revs pretty cleanly but has what sounds like a small end bearing noise. Bike is running on premix 30:1 ratio
The engine was re-built with all new parts
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Post by shaunthe2nd on May 31, 2023 20:34:02 GMT 1
Could be a number of things without hearing.
Has the head been re-torqued after its been run a few miles after a rebuild?
Also check that the exhaust flanges are tight and not leaking too.
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Post by arrow on May 31, 2023 21:37:32 GMT 1
Check it's not just the kick-start rattling.
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Post by Gitram on May 31, 2023 23:56:02 GMT 1
keys rattling on the top yoke..?
marti
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Post by dusty350 on Jun 1, 2023 6:58:55 GMT 1
A video would help. If you sign onto a Flikr account - loads of info on the forum - you can upload vids as well as pics. Phone mics aren't the best, but it's better than nothing  Out of interest, who rebuilt it ? Receipts for parts ? Basically, can you prove the little ends were replaced with good quality alternatives ? Welcome to the forum Dusty  |
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Post by 4l04ever on Jun 1, 2023 9:34:50 GMT 1
Kickstart idler gear
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Post by 4l04ever on Jun 1, 2023 9:35:59 GMT 1
Use an engine stethoscope to track where exactly the noise is coming from.
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Post by chrisg on Jun 1, 2023 11:14:34 GMT 1
Use an engine stethoscope to track where exactly the noise is coming from. Or next best thing, a long screwdriver. |
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Post by chrisg on Jun 1, 2023 14:09:12 GMT 1
Use an engine stethoscope to track where exactly the noise is coming from. Or next best thing, a long screwdriver. Not to be confused with a "long stand" that I was sent to the central stores for, when I was an apprentice in the late 70's. The storeman came back after 30 mins and said "is that long enough", then the penny dropped. F****** T*** |
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Post by pdxjim on Jun 1, 2023 15:40:50 GMT 1
The vid was up on Facebook yesterday or the day before, as above I suggested a stethoscope or long screwdriver to identify the location of the problem. Would be helpful if the OP posted the video here as well.
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Post by JonW on Jun 4, 2023 6:33:00 GMT 1
without video im going to say 'idler' like Rob did...
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brads
Weekend rider
Posts: 53
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Post by brads on Jun 9, 2023 13:39:11 GMT 1
Hi everyone, Looking for advise, my LC350 4LO has just had engine rebuild but has a noise which I can't identify..the bike starts and runs on both cylinders no probs and revs pretty cleanly but has what sounds like a small end bearing noise. Bike is running on premix 30:1 ratio The engine was re-built with all new parts What's the bore size? If it's more than 1mm oversize then chances are the piston or pistons are hitting the head gasket. You will have to trim the head gasket to suit the oversize bore.... |
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Post by crogthomas on Jun 9, 2023 14:27:18 GMT 1
Check it's not just the kick-start rattling. Riding along one day, on a hill alongside a valley, I heard a wub, wub, wub noise coming from the engine. Instinctively I kicked my knee out and started looking for the fuel tap, then realised there was something much more serious going on. Slowed down and was looking down at the engine as I coasted to the stop, to then look up to see a chinook helicopter flying alongside me about 200m away. Panic over. |
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