David Keith Posted October 28, 2006 Report Share Posted October 28, 2006 (edited) 2001 Banshee has completely rebuilt engine. It leaked between cylinders before overhaul. -new crankshaft with o-rings on inner bearings & middle seal -new pistons with bored cylinders (first over) -used Yamabond on all mating surfaces when I put it together Now it will not hold 6 psi on either cylinder. It leaks from one cyl. to the other... Why won't this thing hold pressure? Any ideas??? :: I have plugged both exhaust ports, plugged both cross-over pipe holes & installed a custom manifold applying six psi into one intake adapter. It just blows out the other intake! Edited October 28, 2006 by David Keith Quote Link to comment Share on other sites More sharing options...
lowriderb Posted October 28, 2006 Report Share Posted October 28, 2006 plug both cylinders and set up one intake for the pressure and see what it does.. Quote Link to comment Share on other sites More sharing options...
addicted Posted October 28, 2006 Report Share Posted October 28, 2006 2001 Banshee has completely rebuilt engine. It leaked between cylinders before overhaul. -new crankshaft with o-rings on inner bearings & middle seal -new pistons with bored cylinders (first over) -used Yamabond on all mating surfaces when I put it together Now it will not hold 6 psi on either cylinder. It leaks from one cyl. to the other... Why won't this thing hold pressure? Any ideas??? :: It is supposed to leak between cylinders. Thats why you only pump up one side when you do a leakdown test. You should be able to find the where the air is escaping using soap and water. Good luck. Quote Link to comment Share on other sites More sharing options...
JKJK Posted October 28, 2006 Report Share Posted October 28, 2006 It should'nt.As long as the crankcase+both cylinders together,hold 6lb for 6min.Your good to go.Test it like Lowrider suggested. Quote Link to comment Share on other sites More sharing options...
David Keith Posted October 29, 2006 Author Report Share Posted October 29, 2006 plug both cylinders and set up one intake for the pressure and see what it does.. It held 5.5 psi for twenty minutes, then it dropped to 5 psi, held that for twenty more minutes. Before the overhaul, it didn't have much draw or suction at the carburetor. Now I just want to make sure it's ready before re-installing motor. I have been told that it should not leak between the cylinders... Quote Link to comment Share on other sites More sharing options...
sheefreak Posted October 29, 2006 Report Share Posted October 29, 2006 It held 5.5 psi for twenty minutes, then it dropped to 5 psi, held that for twenty more minutes. Before the overhaul, it didn't have much draw or suction at the carburetor. Now I just want to make sure it's ready before re-installing motor. I have been told that it should not leak between the cylinders... It does leak between the cylinders as it is supposed to. Only dropping 1 psi in 40 minutes is spectacular! Run it. Quote Link to comment Share on other sites More sharing options...
platinumjason Posted October 29, 2006 Report Share Posted October 29, 2006 5.5psi at 20 minutes is golden. Most people go by 6 pounds for 6 minutes. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted October 29, 2006 Report Share Posted October 29, 2006 I agree...David. Run that bike....you've been through enough and have been waiting long enough. If it started leaking down on that gauge like a tire going flat, I'd worry...you are just fine! I don't even wait 20 minutes.... Git R Done!! Quote Link to comment Share on other sites More sharing options...
bansheeseat$$ Posted October 29, 2006 Report Share Posted October 29, 2006 Agreed,your not going to have a issue with those readings.run er. Quote Link to comment Share on other sites More sharing options...
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