Well.I got it wrong then,but my way of thinking is when one wants to investigate, then is up to something,doesn't it?Jerzy,
I am not suggesting that I wanted to make any modifications.
I am doing it now.I was only inquiring to see if anyone had done this.
One can always try to sell but without the buyers there will be no sales.What I think is that there are still some good people wanting to help others and share own experience.Maybe they are trying to sell modified machines at a very high price.
One can put a new bike in museum or own bedroom to keep it original, or ride it and keep improving things as many times as needed to own liking in order to bring it to today's standards.Motorcycles are only original once. They can be restored many times.
I'm resurrecting an old thread here, but I did a recent job that's relevant to the discussion. Being a mechanical engineer and classic motorcycle enthusiast, a friend asked me to give an engineering assessment of his proposal to install a primary chain tensioner on his 900 Sei. Here is part of my response to him:
Most (if not all) bikesthat use inverted tooth type primary chains (Morse, Hy-Vo, etc.) don’t have tensioners.
Pre-tensioning of inverted tooth chains is generally not necessary, especially with short chain runs typical of motorcycle primary drives. A tensioner is only considered necessary when there is a need to eliminate backlash on reversible drives, or if there is a large distance between sprockets (as with a cam chain for instance). Neither of those conditions exist in a motorcycle primary drive.
A rule of thumb is that the drive should be designed with shaft centre distances such that the sag in the chain is less than 1% ofthe distance between sprocket centres. That’s when the chain is new. It’ll get a little slacker as the chain beds in and wears during service. 2 or 3% sag is quite OK. But if the chain drive is noisy because it’s slapping all over the place (more than 3% sag), you need a new chain rather than a tensioner.
So, I wouldn’t recommend a tensioner. It may quieten a drive that’s noisy due to the chain being worn out. But that’s not a really a good thing. You could end up leaving the chain in service too long, resulting in carnage if it eventually breaks.