I recon around £1700 - £2000 it's hard to say.
It's not the big stuff that costs the money you know how much the rebuild kit is so you budget for it, it's all the little stuff that keeps adding up, there is stuff I bought that isn't mentioned in the build like the little side light bulb at £7 the grips, wet n dry, scotchbright, ally cleaner, de greaser, brushes, polishing mop, paying to get the front wheel bearings removed, paint undercoat and laquer......
The list goes on lol
I would say including buying the bike at 2.5k it now stands me at about 5k but with the pipes, suspension work and engine rebuild the bike is as good as it's ever been...possibly better.
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold