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**CarsOrBikes** · 01 Jul 08, 08:54 PM

Ghost actually mentioned the w/p as a possibility, but el toro first made a sound point, in that for 6 quid? a cap 'could' be the cause. It does vent at a set pressure, and if faulty, can explain what yours is doing. If nothing changes, it could still be an air lock, things need checking like equal temp hoses, to see if t/stat gets opened? Confirm w/p actually 'is', hoses may 'move' (expand/contract) a little as revs raised a bit, or with cap off the level can be seen to 'swirl' or appear to drop, then raise slightly at idle again. Air locks can be a pig to get out, sometimes it helps to let it spew out what it wants, (don't wait forever) and top it up with boiling water again (slowly), to keep the t/stat open (or even open it in the first place). You should be able to get away with running the bike for a while with the cap off to get an idea of how quikly it tries to expel. I may settle if you let it throw 'some' out, and see if level suddenly drops further than you think it should for what just came out (if you get what i mean) then top up slowly with v/hot water, see if it settles. If you get a longer interval than at first, you may have released the lock, wait for a bit longer, if you think something has changed, get the cap on and run it further to confirm.

Hard to explain, I had a pig of an air lock after experiencing exactly what you are but on an RSV 'R' 04 that i bought as a cat 'c', the salvage dealer had fitted a coolant hose, and topped it up correctly with coolant etc. and even run it for 'a period'. It was only after i did 'my bit' that i found the problem. I was initially worried there was more to that bike, but in fact just patience and 2 - 3 goes at letting it throw stuff out, finally got it. Coolant circuits dont differ 'that' much in the basic operating principles, hence my suggestions, my 2p if you like.
I Don't know how much you want to try, but it can be quite gratifying to find out what it 'really' was.

Cap first if 6 quid?

Kettle on twice, 1 for tea, 1 for standby to top up as required (bike not tea) :-)

01 Jul 08, 08:54 PM	#16 (permalink)
CarsOrBikes L-plates Join Date: May 2008 Location: Wirral Posts: 76 CarsOrBikes's Gallery Bike: Aprilia RSV Factory	Ghost actually mentioned the w/p as a possibility, but el toro first made a sound point, in that for 6 quid? a cap 'could' be the cause. It does vent at a set pressure, and if faulty, can explain what yours is doing. If nothing changes, it could still be an air lock, things need checking like equal temp hoses, to see if t/stat gets opened? Confirm w/p actually 'is', hoses may 'move' (expand/contract) a little as revs raised a bit, or with cap off the level can be seen to 'swirl' or appear to drop, then raise slightly at idle again. Air locks can be a pig to get out, sometimes it helps to let it spew out what it wants, (don't wait forever) and top it up with boiling water again (slowly), to keep the t/stat open (or even open it in the first place). You should be able to get away with running the bike for a while with the cap off to get an idea of how quikly it tries to expel. I may settle if you let it throw 'some' out, and see if level suddenly drops further than you think it should for what just came out (if you get what i mean) then top up slowly with v/hot water, see if it settles. If you get a longer interval than at first, you may have released the lock, wait for a bit longer, if you think something has changed, get the cap on and run it further to confirm. Hard to explain, I had a pig of an air lock after experiencing exactly what you are but on an RSV 'R' 04 that i bought as a cat 'c', the salvage dealer had fitted a coolant hose, and topped it up correctly with coolant etc. and even run it for 'a period'. It was only after i did 'my bit' that i found the problem. I was initially worried there was more to that bike, but in fact just patience and 2 - 3 goes at letting it throw stuff out, finally got it. Coolant circuits dont differ 'that' much in the basic operating principles, hence my suggestions, my 2p if you like. I Don't know how much you want to try, but it can be quite gratifying to find out what it 'really' was. Cap first if 6 quid? Kettle on twice, 1 for tea, 1 for standby to top up as required (bike not tea) :-)