Across Starting and Fuel Leak problems

Hey Ben

Did you get a batch of bad fuel ? white smoke can mean a blown head gasket, valve stem seals are shot, waterpump seal gone... could just be a bad batch of fuel.

how was the temp after filling up ?
when you changed the oil was it all black, or was there coolant in there ?
When you say carby adjustment, what did you do ?

Chris

 

You can check the valve stem seals by doing a leak down test , but from what you have said the bike ran fine before you fuelled up, maybe drain the tank and try some fresh fuel first ? Could be as simple as a dodgy batch of fuel ?


Sent from my iPhone using Tapatalk

 

i concurr if there is no water in the oil the water had to get through the system some how to turn to white smoke. Did it rain prior to filling up? Water may have gotten into the servos tanks.

 

Could be an internal head gasket leak into the cylinder. Sounds like that to me I'm afraid. I can't imagine the servo fuel would be that contaminated by water.

 

could be dirt under the float needle and seat. need to remove float and take needle valve out and allow some fuel to flow through and take any crap with it.inlet hose could have detiorating rubber from e10 use by previous owner.

 

check the float heights then as the float is meant to cut the fuel off instead of flooding. the needle valve could be damaged? do they have a rubber tip?groove worn on the needle?

 

did not see greys reply when i left mine but same answer.

 

Those hoses that go to the carbies if they are open ended to the bottom of the bike they're likely to be your carby bowl overflow hoses. As has been said, for some reason you're probably flooding the bowls either because of the adjustment you made or because of something not seating. My first fix would be to put it back to the way it was, not saying you did anything wrong but if that eliminates the problem it's the easiest fix for you.

On blowing the smoke, when the bike is running get a piece of clean white paper and hold it behind the exhaust. Not too close or the heat from the exhaust itself will likely evaporate anything that splatters on the paper. If the paper gets wet - it's water and you've probably got a head gasket problem. If it gets all oily then there's probably a ring problem or similar. It's a bit hard to diagnose but at least you kind of know what you're looking for. When you drained the oil, did you keep it in a container? Water will separate from the oil so observing the container for the next couple of days may see a separation which will confirm the above.

Usually temperature gauages won't fluctuate much, especially if your bike is water cooled. 1/4 to 1/2 is quite a movement, and I wouldn't think flowing air would affect the gauge that much from highway to idle. Just my thoughts though. It may mean it is worth checking your water pump, for this I usually just take the cap off the radiator and start the engine and check if water is moving. Some radiators are pressurized when working though so check your manual first