Transmission noise on Honda S Wing .

[Radiomax10]

I bought the scooter new in 2009 . It has now covered 8000 miles . Always serviced well and is in mint condition . From day one I was worried by a noise that seems to come from the transmission . It is worse when I accelerate hard from a low speed . Once I reach about 38 mph it gets better and when doing 45-50 or above it is fairly quiet . When cruising at a constant speed it is not really there . On overun it is very quiet . Hard to describe the noise . It is low pitched and almost sounds like the belt hitting the case in a fast rythmic way . It is at its worst when riding on a hot day . I have done a few motorway trips at 60 mph . It sounds really loud after going fast and then riding in traffic . I notice that the belt case gets pretty hot under these conditions . I took the bike back to the dealer after the first week . He rode it and said it was normal for this model and not a problem . However as time has gone on , it seems to have got louder . The engine is very quiet and runs perfectly . Top speed and power is fine . I can still get 65 mph + on the flat with no vibration .Acceleration is just as it ever was . I removed the belt cover and found very little dust inside . The belt looks perfect and I can see no contact marks on the case . There is no play on the crank / front pulley and none on the clutch bearing either . The belt is not loose and there is no evidence of cracks or fraying . Maybe I worry for nothing but this noise spoils my enjoyment of an otherwise superb and totally reliable bike . Any comments would be VERY welcome .

[davebike]

Done a fair bit on silver wings Sadly the transmission /clutch is the weak point

I suspect worn or damaged transmission rollers or pull away clutch
It is transmission strip down time be careful silver wing belt rollers and clutches are very expensive !
____________________
Dave
NC750Xdct + others at work !
davebike1@gmail.com

[cb1rocket]

I belive he is referring to the S wing 125. Not the 600 silver wing.

The bearings on the rear clutch assembly is probably shot. I have dealt with 5 s-wings and they all make a racket from the transmission. Is fixable and like you says go away after speeding up as the axle and bearings run at the same speed so no bearing movement.
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Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852

[Radiomax10]

Yes , the bike is an S wing 125 cc .
Strange though that the noise was there even from new . I have removed the case and there seems to be no play on the clutch drum . If the bearings were worn , would I feel it by trying to move the whole unit . Would I feel vibration from a worn bearing ?
Thanks for comments .

[cb1rocket]

you would hear it if you spun the clutch once the bell housing is off.

Vibrations is possible but usually from a slack/worn belt
____________________
Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852