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400/4 Exhaust

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Nurse Julie:
Hi Ash
Not quite sure what measurement your looking for but I have just looked at mine and I have 8-10mm between the side of the collector and the sump. Mine are standard original down pipes / collector. The silencer to collector box join on mine has no gap at all.

AshimotoK0:
Thinking of removing the Saisei = CMS NL = Yamiya downpipes and comparing with my NOS Honda set. Like in photo attached. Also push the collector towards the wall and make comparison measurements from wall to relevant points. Open to suggestions?

Any thoughts.

My initial opinion of these pipes is:-
Chroming/welding as good if not better than OEM (OEM Honda had silver paint on some of the welded joints HONEST !!!)
Appearance ... almost like OEM..... would need anorak like me to fault it and much better than the initial repro's that DS sold (he sells much nicer ones now ..not sure if the same as Ymiya/CMS)
Will fit but needs tweaking with bracketry possibly (F2 late F1).. May need to open the slotted holes on  frame mount lugs on F/F1 (pillion mounted footrests like mine).
Worst point is NOT double skinned like OEM which is a bl**dy shame , that in this day and age nobody can successfully manufacture within a budget.

Cheers ...Ash [ Guests cannot view attachments ]

stevush:
I have standard pipes already off the bike, tatty and rusty but may serve your  purpose, in Seaham ?

Steve

AshimotoK0:

--- Quote from: stevush on November 24, 2015, 09:09:44 AM ---I have standard pipes already off the bike, tatty and rusty but may serve your  purpose, in Seaham ?

Steve

--- End quote ---

Cheers I already have the NOS Honda set taken off my 400/4 and then the plan is to remove the Saisei ones I have for evaluation and compare. Cheers for the offer though.

AshimotoK0:
Measured 'em and looking at the assemblies side by side there is a slight difference.

This results in the angle of the exit of the outlet pipe being slightly different. Therefore, with the Saisei assembly, you have to lift the rear end slightly more to get the silencer to fit the bracket and in doing so there is a tendency to  move the collector slightly closer to the sump. Having said that I could get the Saisei pipes to fit OK  after carefully readjustment and tightening gradually, achieving  a sump to collector clearance of around 8mm . This was greater on the stock pipes by about 5mm (12-13mm). This was with a standard HM377 Honda silencer, not the Brituro/Yamiya/Dave Silver replica and on an Aug '75 F model with pillion mounted footrests (exhaust mounts welded on frame, not separate bracket as on late F1/F2's)

Hope this helps!

P.S. You can tell Honda double skinned headers on 400/4, 500/4 by the four spot welds at the flanged end of the pipes. Presumably they take two concentric tubes, spot weld them at the flanged end  and then bend. I don't know why this has to be so difficult to do nowadays as opposed to 1975. Not dissected pipe but I think the double skinning extends to about 1/3 of the pipe length, enough to take the heat out of the exhaust gases. [ Guests cannot view attachments ]

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