Strange sound after lowering

[harold]

After talking with someone on this forum, I checked the preload on the shock, and it was around 2". Since this Baghira is too tall for my 58 yr old 6'3" body, I took it down to having about 1/4" of threads left on the shock, and dropped the forks in the triple clamp 15/16", which is about as far as they will go without hitting the bars. I also had to cut the kick stand down about an inch so the bike wouldn't fall over.

2 hours later, moving the preload nuts are a real bitch, the bike dropped around 2" and is much easier to mount and dismount. However now, I hear, and people several yards away, a strange sound that I have never heard before. I cut the rubber flapper in front of the rear tire thinking that was rubbing, which it was, and no difference. It only makes this sound while moving, and of course you can't hear it when getting on the throttle with the D&D exhaust. My girl friend says it sounds like the sound a scooter makes. I think it sounds like something rubbing, metal to something, but I didn't do anything except take the preload to almost the highest level. It isn't real loud, but you can hear it putting around constantly, but it doesn't change that much with speed or RPM. Unless you gas it, and then you can't hear anything but the exhaust.

I also backed the pilot screw out to 7 turns, and it helped everything from starting without the choke to not popping on deceleration, to getting up and going.

I am baffled, as nothing I did should have made this sound. It was getting dark, I was pissed off, and I parked it.
Any ideas?

[DAVID THOMPSON]

chain dragging on top the swinging arm ??
my traveller hits there bad when the chain is loose
also left mark on the bottom side
i removed the o ring chain and went regular chain
and it sure runs better seems like o ring chain is very stiff if not ran every day
also look if yours has a tire huger that it is not now dragging somewhere
dave

[harold]

It may be the chain, but it doesn't look like it. I put it on a rear wheel stand, and ran it in 1st and 2nd gear, with no sound at all. When riding, I noticed now that the sound, which is like a vibration of metal, only happens with gas. You only hear it, not feel it. When I let off the throttle, it stops. Does the pre-load affect chain tension?

[harold]

Fixed it. The chain somehow had started hitting the lower chain guard, right in front of the sprocket. I bent it back over a 1/16", and the sound is now gone.

[DAVID THOMPSON]

good deal
i road bmw from 1969 to 2002
and i do miss the driveshaft
working on a 1971 750 motor into a 1965 /2 frame
will be nice but is taking forever to get done
dave