SOHC.co.uk Forums > CB350/400
Fuel tubes
Lobo:
Hi Bodd,
There ought to be a frame clip on the spine bottom; from here how's abouts simply clipping / tying it to the RHS frame downtube forward of the battery and thence between the gearbox & swing arm to vent to atmosphere. Don't have the bike nearby... just a guess.
Whatever you do remember oil (mist) will be trying its hardest to coat your back wheel.... so ensure the vent is offset & pointing outboard as far as possible.
750 chaps... doesn't one model vent from 1/2 down the swing arm? Or did I dream that?
Simon
Bodd:
I was thinking of refitting the chamber breather and attaching it to that but I thought it might be spraying oil mist into the empty filter box, preferable to spraying it on the back tyre but still not good, I might just get a filter and use the proper route and connection.
Lobo:
Slight glitch with venting to the empty filter box is that the mist is not being sucked back into the air manifold box / reingested into the engine... and so will have to go somewhere else. And thus it would likely pool into liquid oil, and thence exit down the necessary vent / drain tube.... and out ahead of the rear wheel. Possibly a worse situation...
On the flip side bike crankcases have vented directly to atmosphere for decades; and often likely ahead of their rear wheels.
No one's verified yet, but I'm pretty sure one of the later K (750) models vented some way down the swing arm.
Bodd:
Thanks for that Simon, I think the best idea is to make a guide clip to hold the end of the tube so it points out of the side away from the wheel.
Dan:
If you're keeping the original filter box you could route the hose to a catch tank with a filtered vent hidden within said box. May need a longer hose but that would make periodical emptying of the catch tank easier. Looking at your RD and CB blogs I would imagine you could do this quite easily and there's no risk of oil mist getting on the rear tyre.
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