SOHC.co.uk Forums > CB750

How to protect new exhausts inside?

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Spitfire:
I used to pour 2T oil in my pipes, seems to work on two stroke exhausts so why not 4 strokes.

Cheers

Dennis

K2-K6:

--- Quote from: Lobo on December 30, 2021, 12:06:20 PM ---For different reasons Sprinta, I add 2 stroke oil to all my bikes; at 150:1 or so, and primarily to prolong the tank life. I’ll assume it can only help wrt exhaust life too, and am now keen to learn what the experts in the field have to say …… ?

--- End quote ---

I see that the same and feel it's beneficial to these exhaust considered how much a replacement is going to cost.

K2-K6:

--- Quote from: Nurse Julie on December 30, 2021, 01:13:55 PM ---Just run the bike a tad on the rich side, rather than leaner.

--- End quote ---

I've the opposite view of combustion julie, the leaner running gives less unburnt content to get the exhaust dryer and less likely to corrode.

You can see it to an extent in cars, years ago with them generally running much richer and prior to more concise mixture control, gave atrocious outflow to exhaust systems with replacement being fairly routine.

With more lean and concisely monitored running conditions it has helped many system run almost indefinitely in relative sense.

vonmax:
My brother bought a repro set for his Z1 what he did was buy a tin of hamerite paint poured it into each pipe swirled it around to coat all the inside then hung them up for 2-3 days to let eccess drain out he tells me no smell of paint and been on bike 6 years now

Nurse Julie:
Graham's 750 K6 is still on the original pipes at 42k miles, with just a couple of very, very small weld repairs on the underside of the bottom right silencer ( the usual place for them to rot) . The previous owner of the bike used it as his daily hack for years and years. I've no idea if the modern versions last this long without rotting out totally though.

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