fork clamp question

S

seattle##gs

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I have a few top clamps and a few triple clamps. The fork tube holes line up but the center spindle does not. Is there a different offset somewhere in the years?
 
Yes, there were different offsets for solo and sidecar triple trees, both 7" width yokes (1954-63) and 7-3/8" width yokes (1964-71) came in two versions. Triple trees for sidecar use bore the casting mark "Sidecar" (7") or S/C (7-3/8"). Offset is smaller for these than for solo riding triple trees.
From 1972 on, NV kept the 7-3/8" width but increased offset for solo riding.

- Knut
 
That explains it...I hope. We struggled with this for a long time and how he got 6 pieces incompatible with each other is a mystery. Thanks.
 
Problem solved. With the purchase of a new bottom clamp everything fit perfectly. You can't believe the amount of time wasted trying to track down the problem.
Now here's a new one. the stem is threaded 28 TPI. I have two steering stem nuts (the bearing adjuster nut), both go on perhaps 3 -4 threads and jam. Flip the nuts over and same problem. This suggests a mismatch in the thread TPI between the two. The threads in the new stem look perfect even under a close examination. So..is there a difference in thread here? I am reluctant to use a thread file on brand new threads.
 
seattle##gs said:
Problem solved. With the purchase of a new bottom clamp everything fit perfectly. You can't believe the amount of time wasted trying to track down the problem.
Now here's a new one. the stem is threaded 28 TPI. I have two steering stem nuts (the bearing adjuster nut), both go on perhaps 3 -4 threads and jam. Flip the nuts over and same problem. This suggests a mismatch in the thread TPI between the two. The threads in the new stem look perfect even under a close examination. So..is there a difference in thread here? I am reluctant to use a thread file on brand new threads.
Click to expand...
There are many features that can be different/wrong about threads.
Assuming it's a pitch error is a waste of time.
Use a proper thread gage.
 
seattle##gs said:
Problem solved. With the purchase of a new bottom clamp everything fit perfectly. You can't believe the amount of time wasted trying to track down the problem.
Now here's a new one. the stem is threaded 28 TPI. I have two steering stem nuts (the bearing adjuster nut), both go on perhaps 3 -4 threads and jam. Flip the nuts over and same problem. This suggests a mismatch in the thread TPI between the two. The threads in the new stem look perfect even under a close examination. So..is there a difference in thread here? I am reluctant to use a thread file on brand new threads.
Click to expand...
06.7652 indeed has 26 tpi CEI threads. If you are sure about the stem being 28 tpi (easy to tell by counting threads over say 1.5" of stem length), your stem nut is for the pre-Commando stem. You need to obtain 06.0341, washer 06.7650 (if missed) and top nut 06.0340 .

- Knut
 
It was powder coated and the other had some thick orange paint so I couldn't see any markings. I have the clamp. free. anyone want it.
Thanks for the info on thread changes. I didn't use the AN website well enough.
All problems have been solved due to this forum.
MDT...you seem to have the answers to these obscure questions...what is your involvement with the earlier twins?
 

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