SOHC.co.uk Forums > CB350/400
CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE - NOW COMPLETE
Nurse Julie:
--- Quote from: Bryanj on October 13, 2017, 02:00:33 PM ---Where do the restrictors fit on the 400. been so long I cant remember, 500,s are in the base dowels
--- End quote ---
They fit right at the end of the barrels to head Bryan. Marked in green
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Bryanj:
Are there equivalent holes at the base gasket or are the holes drilled at an angle into a stud hole, isn't clear on base gasket pic. EDIT
Looking at the Motogrid parts list there are dowels in the base gasket at the outsides and I suspect the oil feed is upwards through those then restricted at the head gasket, what I cant see is if there are any O rings at he base joint.
This would mean the oval holes at the studs are for drain down.
It does mean those holes need to be kept super clean on assembly, its easy to get bits of base gasket down the holes which then blocks the restrictors and seizes the cam. I know Julie and Trigger are well aware of this
But I write this for everybody else as it is valid for all the fours
Nurse Julie:
Pictures from bottom to top. The oilway starts (or finishes as I can't quite work out which way it is going yet!!!) in the main bearing housing.
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And comes out on the top of the base (see post on page 25 of this thread re inserting an 'O' ring around this dowel )
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Up via a dowel between the base and the barrels (dowel not in situ in pic)
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Up through the barrels to where the oil control valve is fitted between the top of the barrels and underside of the head ( valve not in situ in pic)
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Up through the head
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Basically it is in a straight line from bottom to top but the hole on the underside of the head has a minute little shelf just inside.
Nurse Julie:
And out the other side. This is where the oil pipes fit that I showed in a pic when I first started stripping the engine that spray the cam.
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Here is the pic again
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Bryanj:
Starts at the mains with oil pump pressure and flow, goes upwards till restrictor which cuts down the flow to keep pressure at the crank ends then sprays niftily over the cam, which i al sways thought was a great design.
On the 500 the restrictor is inside the dowel in the base joint which has an O ring round it, they must rely on the dowel being a decent fit and a good gasket seal on the 400
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