Katana Owners Club U.K.

Thank you Fossie, greatly appreciated.
The ID of the bore is 4mm larger for the first 20mm, then the diameter reduces to exactly the same as the 550 exhaust....that is the only difference with the ID.
Do you still think that could be for 650 ?
Thank you again.

All i really want to know, is if anyone knows what this exhaust could be off - i.e. GS650, or if oversized for some reason ?
Thanks.

Mark

Hi, Been a while as i had issues logging on....anyway, sorted now ! I bought 2 new old stock original exhausts for my GS550 M Katana. When they arrived, i noticed the left hand exhaust did not fit in the manifold...right hand side fine with approx 36mm OD, but the left one has 41mm OD so wont fit in...

Hi Fossie,

Really sorry i didnt respond to this....i was working at sea then my password wouldnt work and its only now that i managed to get it reset !

Ebay the way to go I think....should be able to get a set for 140 ish as you say....shame as our local tyre garage is usually cheap but not this time !

Interesting....seems 100 and 120 is the way to go....set of Avons were only 20 bar cheaper....so might go for BT45's.
Thanks for sharing this info.

Hi, According to my manual, standard GS550 M Katana tyre sizes; Front; 19 x 3.25" H19 Rear; 18 x 3.75" H18 The old tyres fitted are; Front; 100/90 - 19 Rear; 120/90 - V18 When I got some quotes, I was told that I should stick with 100/90 - 19 and 120/90 - V18, as the older narrower ones would make t...

After measuring, I bought the seat you mentioned Fossie....as you quite rightly said, it does fit ! So thank you so much for your help...greatly appreciated.
Also thanks Craik but no longer required.

Very interesting....I have asked the question.
Many thanks Fossie for sharing your knowledge....I will confirm outcome.

Many thanks for the help everyone, greatly appreciated. Craik, is it possible you could please photograph the rest of the back of the seat....with maybe a tape measure running along the side to give me a rough idea ? I think Fossie is correct but just to be sure ! I am planning on weld repairing my ...