SOHC.co.uk Forums > CB350/400

400 Four - PETROL GRADE CURIOSITY ?

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wildtapholer:
After the carb strip down and lots of problems getting the float levels correct, the petrol I got was regular(or supposed to be) just before we went E5 and E10 route, but I can't help noticing the carb overflow pipes, I keep getting this yellow discharge, from the over flow pipes if I run my fingers over the ends. I haven't took it out for a blast yet after a sympathetic restoration, just a start up in the garage, but it keeps fouling the plugs and running on 2 cylinders, I'm tempted to drain the tank and get some ansel I think it was called, from the lawnmower centre.

400 Cafe Racer:

--- Quote from: allankelly1 on October 11, 2021, 09:54:06 PM ---I think the main problem is if you leave the bike standing for a length of time

Extended storage leads to the fuel absorbing water as its hydroscopic that then leads to rotted tanks as the water separates from the fuel and then sits in the bottom of the tank

Same happens in the carbs bowls that can rot brass ware etc

Also like it says seals need to be viton but is new to here so most older bikes are not e10 suitable due to older type rubber in use

Also hear that if left even in newer bikes if they are not used often the fuel will damage injectors as you cannot drain these for long term storage unlike good old carbs

I think for newer vehicles obviously the seals are compatible and the main thing is if it’s in regular use the fuel does  not remain for long in the tank and other critical areas of the fuel system

Also not god for my RD35C either


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400 Cafe Racer:
Thanks for your inputs and responses guys. ;)

Let me throw another variable into my Curiosity question

1. What about petroil mix 2 strokes, do they suffer the corrosion problems or are they inhibited by the presence of Oil in the fuel. ?

2. Our mineral oil requirement for these Hondas can have an effect on the rate of upper cylinder / combustion chamber carbon deposits, as it does in many engines of that era. If the consensus on Q1 is positive, then why not add a small amount of the latest oils to the petrol, like Total INEO ECS that clean the combustion chamber and protect  the catalitic converter.  Clean engine and no rotted tank or Carbs, also acting as an upper cylinder lubricant UCL  !!

Thanks

Dennis :)

oldchuffer:
I had the same issue as you with my CB750 wildtapholer - i think its Aspen you mean. I drained mine, filled it with Aspen and its been fine since and starts so much easier and its been in for nearly 4 years now.

allankelly1:
E10 is bad for my RD350LC

As it is a pumped system rather than premix in many ways the fuel system is no different to a 4T so the risk of a rot tank fuel line or carbs is still the same as you are just adding oil at the point just before the mixture enters the cylinder

Also I think for premix there is a greater risk of the oil not mixing correctly causing more wear or a potential seizure


 

Best wishes Al

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