SOHC.co.uk Forums > CB650

Cylinder Head Bolts

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Bryanj:
The only place you will get those is Honda if they are still available, and they won't be cheap

Paull:
Hi Bryan,

Do you think studding them like a 550 will work?

Personally I don't see it will make much difference. 

All Views welcomed

Paul

matthewmosse:
I have got as far as trial fitting a 650 top end loosely on a 500 bottem end and it looks like it might work so I think that could be viable.

Paull:
Hi  matthewmosse,

I cant see it will make much difference.

My mate had an idea, open the 12 treaded holes up to 10mm tread put a 10mm tread on the studs then turn them down to 8mm (the bit sticking out) put an 8mm tread on the other end and they won't pull out. A lot of work but it might work.

I have stripped it down to bare bones today the top case has three helicoils, 4 snapped bolts and a chip.

I will stick it on the milling machine tomorrow then tig up the case.

All should be well, come Thursday (Bloody customer getting in the way).

Not much to do then :o :o :o :o

Why a 650 top end on a 500 bottom end is it a gearbox thing.

Paul

matthewmosse:
The nearest bottom end I had to hand that had no top on it (if it fits a 500 then it will fit a 550 - think the holes for the barrels to locate in in the cases might be bigger on 550, the 500 bottom end may be a hybrid of 500 and 550 bits). I bought a 650 head and barrells dirt cheap, don't have a 650 bottom end but figued some extra ccs might help move the sidecar along a bit faster. I'm planning on restoring the 500's original engine, but in the meantime thought at some point a 550/650 hybrid built up from whatever bits I find best out of the pile of spares I've ammassed over the years.

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