Honda-SOHC
SOHC.co.uk Forums => CB500/550 => Topic started by: SteveW on April 18, 2020, 03:18:32 PM
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Obviously haven't used the 550 for the last few weeks.
When I last rode her I turned the fuel tap off about 1/4 mile from home so the carbs are empty just as I get home.
In the garage on the center stand there is no sign of leaks. I took the bike out the garage the other day and left it on its side stand for a few hours, as I needed the space in the garage to rebuild a 1963 Vespa engine.
Came to put the 550 back in the garage and noticed there is a tiny trickle of oil running down the left hand side of the engine, down the middle of the cover that covers the front sprocket. Had a look and can see that the oil is dripping down from the bottom of #1 carb float bowl. The outside of the float bowl is covered in it?????
Its definitely oil, no smell of petrol and the carbs are empty of fuel anyway. I cleaned it up, put it on the centre stand, checked yesterday and no oil leak, only does it on side stand.
Any ideas? Bike runs fine by the way.
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That's one of those 'Anti gravity side stand oil leaks' 😁😁😁😁How bloody peculiar. Its not a loose tappet cap is it, that's the only thing higher than carb #1 which is in a vertical line with the sprocket cover below? Or is it the cam end cap leaking and tracking , they are very prone.
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Could it be a little oil draining from the airbox?
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Could it be a little oil draining from the airbox?
The breather pipe is not connected to the air box at the moment.
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That's one of those 'Anti gravity side stand oil leaks' 😁😁😁😁How bloody peculiar. Its not a loose tappet cap is it, that's the only thing higher than carb #1 which is in a vertical line with the sprocket cover below? Or is it the cam end cap leaking and tracking , they are very prone.
Tappet caps and cam cover are bone dry.
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Could it be a little oil draining from the airbox?
The breather pipe is not connected to the air box at the moment.
Is the Breather pipe fitted to the Breather cover on the top of the engine?. I think the outlet pipe is on the right side of the cover though, not the left, so still wouldn't explain how the oil got down the near side though and there shouldn't be any significant amount of oil up in the Breather cover anyway. Aren't leaks a pain 🙄🙄🙄🙄🙄
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Breather pipe is connected at the top of the engine.
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Is the breather pipe split
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Breather pipe is fine.
This possibly sounds far fetched, but could oil get past the valve stem oil seals. Then down the valve and back all the way into the carb bowl. Then leaking out of the carb bowl seal?
The rest of the carb is clean, it’s just the bowl that has oil on it.
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Breather pipe is fine.
This possibly sounds far fetched, but could oil get past the valve stem oil seals. Then down the valve and back all the way into the carb bowl. Then leaking out of the carb bowl seal?
The rest of the carb is clean, it’s just the bowl that has oil on it.
I don't think that could happen but if you pull the plug out of cylinder #1 the combustion chamber would have to be full of oil to confirm your theory.
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I’ll have a look tomorrow and take some pictures. It’s doing my head in :(
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Have you put oil down the throttle cables?
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Also is there oil on the gear shift shaft? And presumably the chain cover is on?
My shifter shaft seal was leaking and was finding its way to the chain and all over the sump
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Throttle cables have not been oiled and gear shaft seal is new.
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#1 float bowl is right behind where the head gasket o ring used to leak a little on my 500/4 back in the day. Could this plus maybe a restriction up the oil way cause a small amount to spray out and drift back on the air flow to the float bowl.