Pipes too big by 1mm.

chaztuna · Apr 18, 2018

Andre,
I believe you mentioned earlier that the 1mm to large relates to the circumference, not the diameter. Is that correct?

André Bourbonnais · Apr 18, 2018

chaztuna said:
Andre,
I believe you mentioned earlier that the 1mm to large relates to the circumference, not the diameter. Is that correct?

Yes. So it would not pass my head exhust threads (where you bolt the lock nut) . Had to take a Dremel and go around the pipe and shave off a bit till it went in.

chaztuna · Apr 18, 2018

André Bourbonnais said:
Yes. So it would not pass my head exhaust threads (where you bolt the lock nut) . Had to take a Dremel and go around the pipe and shave off a bit till it went in.

I suspect that this interference issue may be caused by a combination of two issues. Warpage of the flange on the pipe, during the welding operation. Distortion of the exhaust port due to either/or/both prior overheating of the cylinder head, causing the exhaust ports [hottest section of the head] to warp. Over tightening of the exhaust retaining nuts by the previous owner(s).
I wonder if the difference in circumference of the flanges of the old versus new pipes is actually a manufacturing defect, or simply wear on the flange of the old pipe? Is the chrome plating still intact on the circumference of the old pipe flange?

NortonMKIIA850 · Apr 18, 2018

André Bourbonnais said:
They offered me a full refund but I decided to grind them down a bit with my Dremel now they are perfect.

Mike replied with this,

We don;t get pipes from Norvil, they are either TJ Wassell (stamped N63 at the ends) or LF Harris stamped 06 3375/6.

Mike has always answered all my questions and Walridge have been good to me so I didn't make a stink.

The plot thickens! Although it may be going a bit off-topic ... The man at Norvil (you know who) maintains that his pipes are made for him, locally, and are the only ones to be stamped 'N 63'. Make of that what you will!

André Bourbonnais · Apr 18, 2018

chaztuna said:
I suspect that this interference issue may be caused by a combination of two issues. Warpage of the flange on the pipe, during the welding operation. Distortion of the exhaust port due to either/or/both prior overheating of the cylinder head, causing the exhaust ports [hottest section of the head] to warp. Over tightening of the exhaust retaining nuts by the previous owner(s).
I wonder if the difference in circumference of the flanges of the old versus new pipes is actually a manufacturing defect, or simply wear on the flange of the old pipe? Is the chrome plating still intact on the circumference of the old pipe flange?

You're over anylizing this. During the chrome plating process the excessive plating caused the circonference to be larger. That's it.

André Bourbonnais · Apr 18, 2018

NortonMKIIA850 said:
The plot thickens! Although it may be going a bit off-topic ... The man at Norvil (you know who) maintains that his pipes are made for him, locally, and are the only ones to be stamped 'N 63'. Make of that what you will!

Things that make you go hummmm! Lol

bill · Apr 18, 2018

this sounds more like mike. you almost never complaints about how he does business. he has a reputation as one of the good guys.

André Bourbonnais said:
They offered me a full refund but I decided to grind them down a bit with my Dremel now they are perfect.

Mike replied with this,

We don;t get pipes from Norvil, they are either TJ Wassell (stamped N63 at the ends) or LF Harris stamped 06 3375/6.

Mike has always answered all my questions and Walridge have been good to me so I didn't make a stink.

André Bourbonnais · Apr 18, 2018

bill said:
this sounds more like mike. you almost never complaints about how he does business. he has a reputation as one of the good guys.

Yeah he's been very cool and honest with me. Always replies to my emails as well.

Pipes too big by 1mm.

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