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Post by adamh6599 on Sept 7, 2015 20:34:08 GMT
Hi Guys,
I recently fired up my newly bought 400sd after being stood for some time. The engine sounded poorly but did quiet down after a while. the noise sounds like a medium pitch wearing noise but disappears after a few second, engine can be hot or cold and happens randomly. I suspected cam in the head wearing, and as then engine was smokey when cold I thought I would change it for my spare. With the new engine fitted that runs a lot better and feels more powerful, tonight I had exactly the same noise. The only thing that has been changed is the complete engine with generator and clutch but Using the original carbs and ancillaries. This makes me think the noise is from something else but does sound like it is from under the tank???
any suggestions would be great, and thanks in advance.
adam |
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mark
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Post by mark on Sept 7, 2015 20:48:04 GMT
Best of luck with that one matey, suppose you could let it develop ,, like they do on the trucks , then they hit it with a lump hammer , if that don't work they go for coffee ,, lol,, joking apart someone will come along and be able to tell you ,, best of luck ,,, cheers mark
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Deleted
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Post by Deleted on Sept 7, 2015 20:51:36 GMT
Rev counters and speedo units can sometimes make an odd noise on the move.
When you totally kill the engine and you are still hurtling along, is the noise still there? This will eliminate a lot.
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Deleted
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Post by Deleted on Sept 7, 2015 20:52:36 GMT
Is this noise definitely related to engine speed- i.e. bike stood still and just revving? With a different engine? Very strange....
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Post by wazzbo on Sept 7, 2015 20:52:26 GMT
could be your rev counter cable, they can whine sometimes
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Post by caprinix1959 on Sept 8, 2015 0:20:20 GMT
This sounds very familiar. My 400NC very occasionally will make a fairly high pitched whirring noise which is pretty loud ,it will then stop and not happen again for weeks. As it only ever seems to do it while i am moving it is very hard (with a crash hat on!) to trace where it comes from and ,of course .as soon as I stop so does the noise,even tho I try to hold the trottle in the same position as i get off for a listen. It has done it when stood still in traffic so it is not related to rolling along the road. It does sem to emanate from the top of the motor,best as I can tell-seems like a very similar issue to Adams bike........
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Post by adamh6599 on Sept 8, 2015 4:14:39 GMT
thanks for the replies guys, it could well be the speedo. I dip the clutch and let the revs die down and the noise remains the same.
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Deleted
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Post by Deleted on Sept 8, 2015 5:28:55 GMT
The metal speedo drive on the front axel may not be seated properly, this will give the sound you are describing.
It will need replacing if so but they are cheap...
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Post by scania on Sept 8, 2015 17:49:31 GMT
Best of luck with that one matey, suppose you could let it develop ,, like they do on the trucks , then they hit it with a lump hammer , if that don't work they go for coffee ,, lol,, joking apart someone will come along and be able to tell you ,, best of luck ,,, cheers mark I'd just like to correct you there Mark, we use a 16 lb sledge hammer not a lump hammer. |
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Post by scania on Sept 8, 2015 17:50:50 GMT
I find that when the battery goes low in my hearing aid I hear a whining noise, a new batter solves it only a few euro from Boots chemist, it's worth a try Adam .
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mark
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Post by mark on Sept 8, 2015 19:00:35 GMT
When I hear a whining noise, I useraly go down the shed to get out of her way.. Lol
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