Im fitting 900rr sc33 5.5" rear wheel on my f2. Found some info with google on this forum about the swap. I checked that kokos old topic where is pdf files linked, but it wont open or load these files anymore. If someone got pics or another info about new spacers i need(thicness) and also need info about rear sprocket carrier machining(how much need to take off material to fix chain line) any info would be helpfull.

 

Have you considered spacing the front sprocket outward instead.
Machining the carrier may line things up, but you'll have very little room between the chain and tire.
And tires deflect and change shape under load too.

Also curious why you are doing this? It's a lot of work to go to just to put a wider tire on.

 

Previous owner had allready put 180 wide tire on that 4.5" stock rim, and it doesnt hit the wheel. Really 5.5" wheel is inly for looks. I like to customise stuff, it will be stripped down fighter and it will look lot better with wider rim.

 

Tires squish and change there profile to fit the size of the rim. A 180 on a 5.5" is going to be wider than on a 4.5" rim.
And they also deform under cornering and load. You need to have more clearance than you think.
I'd mount it and mock it up and take some measurements first just to be sure, but that's just me.
But you're the one doing this, so good luck. Post pics when it's done.

 

Have you thought about just having your F2 wheel widened ? That would definitely be the easier option for sure. Then you wouldn't have to have any machining done what so ever. No spacer making, no modifying sprocket carrier, no home made brake caliper bracket...….nothing.