From the seller: “This is a genuine barn find. When I picked it up it ran ok a bitter sluggish, covered in oil and mud. The chap I bought it off told me he used to ride it on his farm and it was just left in the barn as he grew older. He felt it was an early motorcross Yamaha. I don’t know may be maybe not, not even sure it’s a 175 to be honest but looks about right. If anyone can shed any light on this it would be appreciated.
Well I just washed it off to see what I bought and found the source for all the oil, a small piece missing out of the rear crankcase. And so it’s spares or repair. If your still reading then I list what I know about the bike.
It has air forks which work well, possibly metzellor. The rear shock is gas filled the sticker informs its Yamaha motor cross shock. It has an ally tank which is clean inside, there are a couple of shallow dents on the left hand side. The rear brake plate appears to be magnesium ( cast on plate) but is missing the brake arm and rod. The front and rear wheel have ally rims, the Michelin tyres are in good condition, the rear wheel has a few loose spokes.
The frame requires repainting but has not been messed about, the frame numbers are clearly visible. Folding footrests , brake and gear change levers are straight. The yokes are straight. The plastics are tired. It needs new handle bars due to rust the levers are usable and not bent, the throttle works but needs a new cable.
The exhaust appears ok but has what looks like a bodged up silencer from another bike. The seat has a hole in it but the base is fine.
The engine has a small hole / piece missing just in front of the gear change. The engine numbers are clearly visible. Apart from that problem I have heard it running but obviously have not made any attempt to restart after identifying this issue. So either a good source of spares of repair and rebuild. The chain and sprockets appear to have plenty of life left in them.”