Exhaust nuts, long & short of them & a spacer?

A few months ago I bought a beautiful set of stainless exhaust nuts that I planned on using when I got my new pipes. At that time I didn't know there were two legnths of the threaded part of the nuts. I have a 850 but no longer use the crossover so at some point the longer type nuts were installed. The new ones I bought are the shorter ones, about 1/8". Looking over old posts people were suggesting using an extra crush washer but I can't see that taking up enough room and sealing well. Has anyone delt with this successfuly? A spacer maybe but I really do not want a leak. Thanks. Glenn.

I wouldn't use extra copper washers as they will continue to crush and be hard to keep tight. I would use a steel washer. You can likely find a thick steel washer at a hardware store with a close OD and then open up the ID to 1.5 inches. Jim

Of course that is assuming your new pipes have a flat flange at the port end. If they have a tapered flange then you need the tapered cones that fit in place of a gasket.

Two solutions come to mind. One would be to ad a spacer to the flange at the end of the pipe,tacking it in place as and stacked the original. Two is to use the Susuki GS 750 crush with the Norton crusher. This works great for me. I have the big 850 nut on my 750.

I don't think the GS750 washers are a good solution for the reason Jim mentioned. I used to use them on my old 850 and I couldn't keep the nuts tight. I eventually ended up with stripped threads.

I use unbalanced pipes, 750 nuts, and steel washers on both of my current Nortons. That works for me. I tighten the nuts when the engine is hot and they stay tight.

Debby

Debby is correct, my Mk3 had 1 short and 1 long nut. (which I thought was because it was made from reject parts, and didn't know there was a difference)
The short one I used 2 exhaust seals/gaskets to get it tight. Tightened them up when hot, same as bevel Ducatis'.
Guess which one stripped the thread !

I will pack the short one with a steel spacer when I put it back together, and use 1 seal/gasket.

graeme

I also use unbalanced pipes, steel washers, and 750 nuts on all my Nortons. And the 750 nuts have alot more threads of each threaded. I personally would NEVER use 850 type exhaust nuts ... there is just not enough threads, threaded making contact IMO. In addition, I also use hi temp RTV on the threads to keep them cushioned and snug. It helps the threads to not get buggered up with all the vibration. Wish I could take credit for the idea, but I can't. I read it somewhere and it really works great !!!

Yeah, go with 750 nuts ,brasstype nice as to look for dissimilar metals , using RTV Silicone base Copper sealant smeared all over those delicate expensive to replace threads . Proper tool. New crush rings. Use all your strength to tighten ,rubber mallot persueder final. Go for a drive. Return with grin , retighten with proper tool with rubber mallet. Have never had one leak, fracture or back off using this method. Enjoy.