Honda-SOHC
SOHC.co.uk Forums => CB350/400 => Topic started by: 350Simon on July 06, 2022, 02:00:47 PM
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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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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.
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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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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 ;D ;D
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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 ;D ;D
Haha indeed it might! Cheers
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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! 😡😡
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If you are going to do that why not Castrol R and get the good smell
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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.
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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.
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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
Sent from my SM-G780G using Tapatalk
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 ;D
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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?
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Castrol R it is. Smells like sweet candy
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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
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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" 8)
Ian
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" 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 ;D 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.
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Interesting thoughts on additives and off course different reasons to add oil to fuel in these old bikes for preservation purposes.
Ian - I think you would see the smoke from Birsay. 🤣
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K2-K6, many thanks for the detailed info, I think this might be the way forward for me and hopefully many others. I'm about to put the 400/4 on the road and that too has genuine Honda chimneys, so they need to be preserved. The greenies have really buggered up my last few years of my enjoyment of classic bikes and cars - don't get me wrong, we should be looking after our finite resources but surely there were better ways to be explored instead of consigning already manufactured vehicles to the scrap-heap. Can't the scientists find a way of combining the reported excess of carbon with some abundant hydrogen to power our existing vehicles?
That's it, all three rants used up today, soap box back in the cupboard!
Ian
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I'll have a rant as well....seeing as it's Friday.
Young Greta Thunberg and her dopey Pals are the main reason why Fuel/ Gas prices are so expensive.
When you openly....and gleefully tell your Suppliers/ Producers that you will be doing all that you can to stop buying their Products ASAP and that they are the 'Devil incarnate', don't be surprised when they all gang up and get their own back by ramping up the prices they demand for their products.........especially when there are plenty of other 'Customers' queuing up to buy them !
Of course Climate Change is a real threat to us all, but jumping in feet first like Greta has, has only made the problem more acute........I bet she wouldn't be welcome in Sri Lanka just now !
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I personally think we have it the wrong way round, instead of strangling economies and making people poorer and face greater hardship which inevitably means they will be become more desperate and make the problem worse we should be using our greatest asset science to fix the problem.
Find a way of neutralising greenhouse gasses, scrub the atmosphere of C02 and other nasties, work together to cool the earth down using the knowledge we have accrued rather than the taboos some of us like to preach to. The current approach, wind and solar energy, electric cars etc just are not going to work so stop the loony brigade taking us down the path to economic and social destruction in the name of salvation.
Jeez now that was a rant wasnt it!
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Just remember that ONE short journey can do the damage. I ruined a perfectly good set of pipes on my 500 years ago. It was SORNED and we moved house, so I illegally rode it the seven miles one cold winter day and left it.
Find a way of neutralising greenhouse gasses, scrub the atmosphere of C02 and other nasties, work together to cool the earth
Unfortunately we are nowhere near this and very unlikely ever to achieve that. Russia loves the heat.
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As mentioned by John in previous post, only running when you know that the pipes can get fully hot to expel condensate helps significantly to avoid corrosion internally.
I believe that sulphur in fuel has an impact on the life potential of exhaust system as it creates mild sulphuric acid in the vapour when burnt during combustion. This risk has been reduced for some time with low sulphur fuel supply, but not entirely removed. Getting started and off choke/rich running is vital to bring combustion temps up and less unburnt fuel passing into exhaust and oil too.
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On the things that give us cause to rant, notice how we are effectively hosed down with constant "news" of all the minutiae of events that really have no impact upon us ? Certainly there's things that are important to us, but seeing clear view of hierarchy when standing in a car wash atmosphere while being completely soaked it's no wonder so many people feel a little despondent about any current situation.
Just the sheer quantity/mass of news gathering and delivery via so many channels is truly astonishing I feel. Many are not physiologically able to, or wish to participate, but persistent delivery whether we want it or not is heading toward the parasitic within society.
It's a truism that all "news" is bad news. The positive is just advertising of one kind or another. Trying to head towards the positive that motivates us is certainly important, a fundamental part of this site and others like it with positive common interests of such value to individuals.
There you go, a rant about rants ;D
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Yes k2 you're right about the sheer volume of 'news' nowadays, it's also too accessible and because of this we end up in a situation where we can read news about news, the journalists have to write about something all the time, simply to justify their existence.
It's part of the reason I removed myself from social media, cut it all out. I don't watch TV, or read the news. The only indulgence for me now is the odd motoring forum such as this. Its a major part of my Sigma personality, I don't need much to survive, just myself and my own thoughts and I'm far more efficient in life doing things my way. Interestingly as a lifelong petrol head I'm not worried in the slightest about the demise of petrol and diesel vehicles. In fact I couldn't care less if my motorcycle or car are powered by electricity. The sole purpose of any vehicle is after all to get you from one place to another, that's it! I'm just using my classics as daily drivers while I can for the next ten to 15 years or so, I pay no road tax, have no mot's, have cheap insurance and smile everywhere I go!
I'm 33 and have never been happier
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Oh and thanks to all for the advice! I'll stick to long fast runs and avoid the temptation to nip somewhere local on it too often.
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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.
Hi 350 Simon,
+1 to what Nurse Julie says. If you have a small bleed hole in the silencer clamp you will be amazed how much condensation water comes out within the first minute of starting. Probably a good egg cup full at least.
It tends to get trapped where the 4 pipes meet together.
Give the bike a proper run and warm up to ensure that the full system is hot and will evaporate any moisture/water.