SOHC.co.uk Forums > CB350/400

Starting to wonder about this bike.....

<< < (2/3) > >>

Sesman:
From a logical point of view, if identifying leaking carbs by ID becomes a convenience, then there is something dreadfully wrong with the carbs…just saying?

Sesman:
Did piki make any per chance. I’d be interested by the way.

Oddjob:
Your right Phil, it shouldn't be a problem, however, it appears that since the introduction of Ethanol in petrol the amount of leaking carbs seems to have shot up, never used to have this problem back in the days of leaded petrol.

Yer, Piki made me a few sets, I'm sure he'd make you some if you asked him. I bought some for my spare carbs as well, thought they'd make a nice extra selling point if I ever sold them. Obviously you need to fit them near the main stand ends of the pipes not up next to the carbs. They are like the HT label ones he makes except I asked him to fit the number horizontally instead of vertically, no idea why Piki thought making the HT ones so you needed to fit them along the lead rather than around the lead was a good idea. 

K2-K6:

--- Quote from: Oddjob on April 03, 2023, 11:51:45 PM ---Your right Phil, it shouldn't be a problem, however, it appears that since the introduction of Ethanol in petrol the amount of leaking carbs seems to have shot up, never used to have this problem back in the days of leaded petrol.
--- End quote ---

I agree with this, just seems more prevalent with these type of fuel.

Anecdotal observation. A long way back we used Trichloroethylene as degreasant in engineering workshops, this used on brass components makes the brass much harder to move in a bearing type situation.  Specifically it's use was to remove all lubricant on the part, which feels similar to how these current fuel we use reacts on these components.  A friend running a garden machinery maintenance and repair company indicates similar, drives them all nuts with problems.

Suggested use of a little oil to help the valves shift and seal is my view of compensation and attempt to overcome this characteristic. 

I have been using castor oil in addition to fuel for this  reason, seems successful, but you'd need to evaluate for yourself and make independent decision to verify if that's for you. Smells like R when burning  :)

Sesman:
Thanks, Ken. I’d overlooked the ‘modern’ fuel issue as you so rightly point out. Has anybody on the site worked out a way to refresh the brass on brass float valves? There must be away of grinding them in the same way as valves..maybe? I seem to recall a small ball bearing dodge I read many years ago, but failing memory can’t recall the method.

Navigation

[0] Message Index

[#] Next page

[*] Previous page