I have had problems with restrictions in my water indicator stream from the engine. (No peeing from the pee hole, using the popular language of outboard motoring.) Either the flow is small or gone altogether sometimes. I never take the chance to ignore the absence of the stream, but stop as soon as possible and clean out the water indicator circuit. At the least, this involves taking off the cowling and removing the small rubber hose and either cleaning the debris out of the hose or the plastic fitting on the bottom engine cover that is the water exit point. But, often, there is no debris there, and I am faced with the task of removing the "water indicator joint" which is Honda's words for the fitting that screws into the engine block where the plastic hose slips over. It takes a 12mm deep socket and nimble fingers and I find dirt or scale blocking the hole. A real pain. I wondered why the hole could not be larger.
I was reading my new Honda BF50A shop manual over and over, and finally looked at page three where it shows that in 2004 and after Honda modified the joint with a larger fitting internal diameter. Eureka! Just what I wanted. I went to my dealer and ordered the parts for a 2004 and later engine. 19312-ZW4-H00 for the joint, 91402-ZW4-H00 for the hose (with a large end and a small end), and 90603-ZV4-000 for the small clip.
As the pictures of the old fitting and the new fitting below show, the size of the hole went from 3/32 inch diameter to 3/16 diameter. That is a 400% increase (due to pi-r-squared). However the plastic fitting on the cowling remains the same 3/32 diameter. No problem. I guess Honda wants a small stream coming out for some reason. But the major problem of removing the fitting from the engine for me will probably be over in most cases. I just got the parts and have not installed them yet.
with the motor running and all the dirt comes out fast...
