Exhaust preservation

[350Simon]

I've got a cb350f fitted with a brand new 4 into 4 exhaust system. It's a David Silver aftermarket system.

Are these as prone to rust as the originals? I'd like to preserve it if possible as I have the sales invoice and I'd rather not have to replace it any time soon!

Someone I work with suggested removing the system, filling the pipes with gear oil, draining and then running the bike until the smoke disappears. Apparently it varnishes the inside of the pipes and helps to preserve them?

Has anyone done this and does it work or is it an old wives tale?

Cheers
Simon

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[Nurse Julie]

Yes, you can rince it out with any oil and it will have a slight beneficial effect. No idea if the 350F aftermarket 4 into 4's are any good but unless you're riding it every day doing 12,000 miles a year, I wouldn't worry about it to much. The worse thing you can do is keep starting the bike up, creating condensation and then not running the bike for long enough to dry the condensation out. That's the main killer for the exhausts.

[350Simon]

Yes, you can rince it out with any oil and it will have a slight beneficial effect. No idea if the 350F aftermarket 4 into 4's are any good but unless you're riding it every day doing 12,000 miles a year, I wouldn't worry about it to much. The worse thing you can do is keep starting the bike up, creating condensation and then not running the bike for long enough to dry the condensation out. That's the main killer for the exhausts.

Fab thank you

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[Oddjob]

I'm fairly sure Trigger mentioned filling them with Diesel as a good solution. Saying that the cost of Diesel these days it might be cheaper buying a new set 

[350Simon]

I'm fairly sure Trigger mentioned filling them with Diesel as a good solution. Saying that the cost of Diesel these days it might be cheaper buying a new set 

Haha indeed it might! Cheers

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[Johnny4428]

I’m going with a cap full of 2 stroke oil in every tank of fuel on the 750 as a trial. Not used many capfuls so far this summer! Bloody weather! 😡😡

[Bryanj]

If you are going to do that why not Castrol R and get the good smell

[Johnny4428]

If you are going to do that why not Castrol R and get the good smell

Nice idea Bryan. Could try local motor factors, might have to get an Amazon order in.

[K2-K6]

If you are going to do that why not Castrol R and get the good smell

Nice idea Bryan. Could try local motor factors, might have to get an Amazon order in.

Definitely a good idea.

I've been running, ahem, field trials of castor oil in a petrol car for  some time  and using  this https://www.amazon.co.uk/Castor-Oil-litres-Pure-Pressed/dp/B06WVD519M/ref=asc_df_B06WVD519M/?tag=googshopuk-21&linkCode=df0&hvadid=344355771029&hvpos=&hvnetw=g&hvrand=16984152145464781704&hvpone=&hvptwo=&hvqmt=&hvdev=t&hvdvcmdl=&hvlocint=&hvlocphy=1006886&hvtargid=pla-685207637751&psc=1 to dose at 100/1 (10ml per litre of fuel) to assess effect.

Also have mixed static samples of both E5 and E10 base fuel sitting in mixed state to gauge any solubility effects over time period. It mixes completely with these fuel which may have some mitigation to fuel stability when not in use. Both castor from bean and ethanol being plant based may have some compatibility that's useful.  The samples show no visible instability over six months when left static.
Smells just like the race oil when used, a little more prominent when used at 75/1 (15ml per litre) without smoke being evident in the engine I'm running it through.

There's many other benefits to using it in other applications to if there's any interest to discuss here.

[K2-K6]

I've got a cb350f fitted with a brand new 4 into 4 exhaust system. It's a David Silver aftermarket system.

Are these as prone to rust as the originals? I'd like to preserve it if possible as I have the sales invoice and I'd rather not have to replace it any time soon!

Someone I work with suggested removing the system, filling the pipes with gear oil, draining and then running the bike until the smoke disappears. Apparently it varnishes the inside of the pipes and helps to preserve them?

Has anyone done this and does it work or is it an old wives tale?

Cheers
Simon

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No means of judging the effects as I've not any experience of it in this application, but can say that it really stinks when burnt on exhaust if it's one of the EP type oils. The EP being "extreme pressure" I believe and facilitated by the use of sulphurous compounds to avoid metal spalling in gear trains under high loading.

I mean really, really stinky 

[Lobo]

I add 2T in my various 4 stroke tanks…. but more with a thought to protecting the tank internals.

Q. I thought modern 2 stroke oils are designed to fully combust and leave no residue wrt green credentials…. so would it actually be protecting the exhaust? (I’m using a marine 2T as it’s what I have in the shed; think it burns really clean)

Q2. How would standard (mineral / synthetic?) engine oil behave if added to the tank at 100:1; would it benefit the exhaust internals more?

[350Simon]

Castrol R it is. Smells like sweet candy

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[Johnwebley]

the exhausts on my 500 are now about 30 yrs old,


  initially I used to put oil in the petrol,but seldom do now,


   they are a little corroded externally,because it gets used,

 my mantra is NO short journies ,minimum run 10 miles,and rev the bike hard to get heat into the pipes,

  luckily without lead we don't seem to get to much corrosion

[Orcade-Ian]

I have a genuine Honda 4 into 4 system on my 350/4, bought new from DS when they were still available and poured oil in mine when new.  Still looks new nearly 20 years on - but only about 8000 miles and not used in salty winters.  It can't do any harm and I don't think the aftermarket DS is any worse than the originals.  I like the idea of the addition of castor oil (K2-K6) - how did you land on 1:100?  This needs exploring methinks.
I've just done a 1200 mile trip on a 95 BMW R100RT and got caught out at one place with only E10 available so I bought some Putoline E10 additive in case - might just be snake oil though.  We are fortunate in Orkney that E10 can't be shipped to us.

Johnny, I think one capful of 2T is way too much - my cap is 6 7/8" 

Ian

[K2-K6]

 " I like the idea of the addition of castor oil (K2-K6) - how did you land on 1:100? "

Technical hedging to get going thus considered:- aggregated experience from many different two strokes at 50:1 being more or less as smoke point deminishes, going above this as desirable but needing to have some effect along with ability to judge that effect reasonably started at 100:1 principally to gauge if there were any unwanted obvious problems without having commited to clean a system out (intending to just run neat fuel through to purge if necessary) by stripping etc.

Going back a litte though, I'd run castor oil without problem in a Honda four stroke 2kw generator set with no adverse effects. Along with varying static periods it has given no observable problems over multiple years of use.  Tank storage/condition and carburettor bowl + jets remain very clean too but this has until recently been with E5 fuel supply.

Intending to then move it onto more extensive field trials  as I became more interested in the effects then decided to go as start point with 100:1 and also without problems in fuel system or combustion.  You can only really smell it as R when starting rich idle is operating or under full load acceleration with, again, richer conditions in combustion.  Since moved it to 75:1 with still no visible smoke but a little more characteristic smell, although extremely mild unless same richer conditions as above description. This too on originally E5 and now E10 with no non E fuel intentionally used.