SOHC.co.uk Forums > CB750

#2 Exhaust fouling frame

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Oddjob:
These engines aren’t rubber mounted like cars and some me later engines. As such there should be minimal movement, it’s clamped very tightly in the frame, so even a few mm should be ok. The more the better of course, try for 5mm and see how you go.

McCabe-Thiele (Ted):
Although my 400 had a Motad system I had trouble getting it to re-fit properly after my rebuild using the mount that was in place. I ended up fitting the front pipes into the silencer using a different rear bracket that came with the bike.

I agree that the rear bracket mounting  bracket  is the key to a good fit. If the pipes into the silencer fit is good then it's worth trying to align the rear bracket so it's under little or no stress when it's clamped up.
 

Lobo:
Ran out of time 1/2 through today, but got #2 pipe off and am struggling to see how to  get the clearance I want - and figure I’m going to have to SLIGHTLY grind it’s ‘hanger hole’ so it butts to the frame off-square…. and ‘tilts’ the exhaust inwards a few degrees.
What’s really confusing me is that I’ve owned / been intimate with this bike and its HM341 pipes 10yrs now, and never been aware of this issue. I stripped it completely down last year, there was no rub / witness markings evident in either the frame nor exhaust - so what gives??? The only 2 things that changed in the rebuild are the newly powder coated frame, and my ‘plastic sleeving’ the footrest bolts as they had excessive vertical slop.

Johnny4428:
Very little scope for altering on these with the single mounting bolt going through the silencers and bolting through a boss on the frame. No mounting brackets as such that could be manipulated.

McCabe-Thiele (Ted):
I agree Johnny iirc I ended up using a stand off spacer as well as enlarging the slots.

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