Subject: RE: Name That Tune (sound)
Author: Brian Murphy
Date: Mar 2, 2004, 8:02 PM
Post ID: 1716197469
kcampbellNH wrote:
Maybe this is normal for a loop motor, I have much Guzzi and automotive experience, but only had one other loopframe, a 70 Ambo. I only kept it about three weeks as I was riding other more exotic stuff (Laverda Jota, 750GT Duck, etc.)at the time so I traded it for a 850-T. That was a decade or more ago. Anyway, I have a 74 Eldo w/amals. It has 29k miles according to the original owner who said the speedo worked. He was right, it worked, but the drive gear in the transmission had been removed (say stolen, or "sourced") along with many other parts, so I really do not know how many miles are on it but I think it is close. Here is what I hear. At just over 3000 RPM a fairly loud, sharp rap, slap, tap, you name it kicks in and drops off above 4000. It is loudest in a neutral load (not accelarating or deaccelarating)or very slight load. It sounds high up, towards the front and possibly louder on the right(could be my better ear!). When I got the bike back in August It had not seen much riding or maintenancein years and I found the oil looking like metalic paint. By advice from this board I removed the pan, replaced it and then changed and strained the oil twice in the next 100 miles and it looked fine. I have adjusted the valves twice to .006 int. .008 exh. If I am doing it right that should not be the problem. Although I have wondered why if you adjust the valves at TDC it seems the clearance actually increases at other positions. Could it be normal slop/wear and chatter in the timing gears? The bike runs great and does not smoke or use oil. Sooooooo, what do you all think?. Is it normal for one of these engines? Thanks in advance for the advice/answers. 98 EV 97 Sporti 80 v50++ 75 T-3 74 Eldo |
I had a similar noise after I rebuilt my Eldo, and it turned out that
the generator mount was just a little loose, and the belt was slightly
over tight. It made a metallic noise from the front of the generator
pulley contacting the block, and took a while for me to figure out.
Anyway, my suggestion id to check out belt tightness and generator
mount.
Good Luck,
Brian Murphy
'74 Eldorado
'78 T-3
'76 R90S