Re: how much compresion should a 01 banshee have on each...
Anything under 105 psi you definately need to rebuild your top end.new pistons/rings and a bore.A stock cylinder banshee with factory pistons should average around 125 psi.After a bore and new pistons you will be around 135-140 psi
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Sounds like your carburetors need a qualified professional to clean and set them... I have built several race banshee's.. the carburetors being perfect are essential to making it run good..
The compression should be at least 125PSI on each cyl. MINIMUM.
HI I THINK IT IS BEST TO FIRST SHECK THE COMPRESION IN THE CYLINDERS, USING A COMPRESION TESTER FITED INTO THE SPARK PLUG HOLE, SPIN OVER THE ENGINE AND CHECK THE READING RECORDING IT, ON PAPER FOR EACH CYLINDER WHEN YOU HAVE COMPLETED THIS ON ALL 4 CYLINDERS CHECK OVER YOUR RECORDED NOTES, IT IS NOT ALWAYS LIKELY THE READINGS WILL BE AS SPECIFIED IN THE WORKSHOP MANUAL AS A BIKE OF 10 YEARS OLD WOULD HAVE LOST SOME OF ITS ORIGINAL COMPRESION, BUT YOU ARE LOOKING FOR A READING SIMILAR ON ALL 4 CYLINDERS, IF 1 IS SIGNIFICANTLY LESS THEN YOU COULD HAVE A PROBLEM WHERE THE PISTON OR PISTON RINGS HAVE FAILED, 1ST TRY THE AFORE MENTIONED CHECK BEFORE YOU START GETTING INVOLVED IN ANY EXPENSIVE REBUILD, IF YOU WERE TO REMOVE THE ENGINE OIL FILLER AND RUN THE ENGINE, IT WOULD BE QUITE NORMAL TO EXPERIENCE SOME SORT OF PRESSURE HERE ALTHOUGH IT COULD GET MESSY AS OIL WILL EMERGE, HOPE THIS HELPS
hello, the drain lines should be on the both sides of your car front windscreen, because this is the lowest place; if you are trying to untape them, must not use a very sharp tool, the best that it can be done is to use compresed air!
go to bikebandit.com and look up yamaha 1990 banshee, they have all the schematics and parts you need. if it's leaking from the radiators, try bars leaks from your local parts stores, from a hose, tighten otreplace hoses, if itcoming from the top end (cylinders) replace your head gaskets/o-rings, if you are getting water in the crankcase oil, you need a new impeller shaft seal and if it's just coming out of the overflow bottle (under the seat) you have too much antifreeze in in or you are overheating fror some reason, usually running lean, too slow or internal engine damage...
Low compression can be caused by either worn or stuck piston rings or by a valve seating problem (which can be in the valve seat, a worn cam or in the rocker/push rod assembly between them). The way to determine is to start with a cool engine (meaning the rings are dry), run compression test on the cylinder in question (or all if you like, I would) then put a little bit of oil in the cylinder/cylinders and re-run the test. If the compression comes up it is the rings. If not it is in the valve not seating properly. Of course after you put oil in the cylinders when you start the car don't be alarmed at it smoking for a couple of minutes until the oil burns out. That's normal.
The fact that it needed water and you know have you no fire on a cylinder means you prabably blew a head gasket. Does it blow out steam when you start it from cold now. You will need to check compression on all cylinders and do a chemical block test for fuel in the coolant first in order to rule this out or in.