Hi Folks,
I haven't been overly active here, but I try to keep up. I get my Norton out every year but unfortunately haven't put a lot of miles on in the last couple years. Last year I put some money into a belt primary drive, 3 phase charging system and new electronic gauges. Nice upgrades, running great.
I noticed a fairly loud clunk noise at idle. It goes away as soon as the revs increase. Clutch in or out makes no difference. Center stand, side stand or on its tires, no difference. I think this noise has been there for years, why I chose to suddenly pay attention to it is beyond me, or maybe it's getting louder.
Last fall I put my mechanics stethoscope on and it's loudest at the back end of the primary case. Verified that the primary is not touching the z plate at all, plenty of room around it. Trans mounts were verified to be tight. Iso's checked and slightly adjusted, no change. Dave Taylor head steady is only a few years old and in good shape. While looking for answers I found some information regarding timing. I re-checked the timing with a strobe and it was right on (Boyer). Got a degree wheel and verified the scale in the primary case is accurate. Didn't suspect a timing issue, but wanted to eliminate the possibility.
So, any ideas what else it could be? It sounds like the primary case is hitting the z plate or something else, but I sure can't find anything. It's pretty lumpy at idle so I'm not surprised it goes away as soon as the revs increase. Where else should I look? Anything with the swing arm?
Thanks,
Ben
I haven't been overly active here, but I try to keep up. I get my Norton out every year but unfortunately haven't put a lot of miles on in the last couple years. Last year I put some money into a belt primary drive, 3 phase charging system and new electronic gauges. Nice upgrades, running great.
I noticed a fairly loud clunk noise at idle. It goes away as soon as the revs increase. Clutch in or out makes no difference. Center stand, side stand or on its tires, no difference. I think this noise has been there for years, why I chose to suddenly pay attention to it is beyond me, or maybe it's getting louder.
Last fall I put my mechanics stethoscope on and it's loudest at the back end of the primary case. Verified that the primary is not touching the z plate at all, plenty of room around it. Trans mounts were verified to be tight. Iso's checked and slightly adjusted, no change. Dave Taylor head steady is only a few years old and in good shape. While looking for answers I found some information regarding timing. I re-checked the timing with a strobe and it was right on (Boyer). Got a degree wheel and verified the scale in the primary case is accurate. Didn't suspect a timing issue, but wanted to eliminate the possibility.
So, any ideas what else it could be? It sounds like the primary case is hitting the z plate or something else, but I sure can't find anything. It's pretty lumpy at idle so I'm not surprised it goes away as soon as the revs increase. Where else should I look? Anything with the swing arm?
Thanks,
Ben