Water In Cylinders?

[DDAADDYY]

My 75 3 cyl.65hp 650 ser.# 7051360 made in Canada got dropped 3 feet on concrete after 6 hours after a rebuild. Now it runs choppy and cuts out if I don't feather the throttle. The mix is 40:1 for break in still and I've changed the cracked swithcbox ( landed on it) and runs the same. Disconnected the rectifier, runs the same.Haven't done a new comp. test yet but after the rebuild all 3 were at 120 psi. Wants to start just fine. Could it be water in cylinders from a crack after the fall? Or some other electrical nusance? The plugs after running<br />are shiny clean, but they we're sandblasted before I got it and looked like they do now. there's some oil on them that readily wipes clean. Looking in the cylinders through the spark plug hole with a penlight, they look O.K.<br />What else can I check. Merc. switch, coil, the cap and rotor look O.K. as do the wires and the carbon tip of the coil wire looks fine. Very frustrated. Thanks for your interest

 

[jimmbo]

Re: Water In Cylinders?

Perhaps one or both of the carb flosts are sticking?

 

[Chris1956]

Re: Water In Cylinders?

DDAADDYY, Your problems can occur from many causes, other than a cracked block. I would do the compression check to rule it out however. I would also check the distributor cap for cracks, inspect the rotor and wires for breaks etc. Then I would look at the transfer covers, carbs and fuel pump for cracks. if these are all good then it is time to check the carbs for proper function. Make sure they are clean, that they didn't "swallow" any debris during the fall, and hopefully you will find your answer.<br /><br />If your compression checks out and you verify water in the cylinders, you may have a crack in the inner water jacket cover or baffle.

 

[DDAADDYY]

Re: Water In Cylinders?

Thanks guys, as it turned out it was carb. The lower cylinder wasn't firing. After a run and a trip to a tech, I showed him a picture of the plugs after I ran it and made a little movie for him to watch on my camera, and he instantly saw the clean lower plug. His tip: to get a spray bottle and spray gas oil mix into the lower carb<br />as it ran and voila instant difference. Good tip.<br />Unfortunately as I was removing the carbs to recarb them,I discovered that both carbs cracked right through the mounting face and were in fact both in two pieces. Got replacements already, it's back together, but too late to try tonight. Awwww Shucks. Keep ya posted thanks for the replies.<br />Russ