pikelucius
Cadet
- Joined
- Oct 17, 2015
- Messages
- 19
Let me just start by saying this motor is a terrible design, and I have done all kinds of work to this motor. In the past 2 years I have fully rebuilt the carbs twice, cleaned the carbs 3 times (not maintenance, they clog easy), replaced both coils, replaced the CDI, and plenty more. The time my CDI took a dump it ran very strange for about a week until it finally wouldn't even start. The problem I am having now has kept me off the water for almost 3 months now and I am going crazy. I am highly skilled in outboards and all things engines, however I am just a garage mechanic. As of now I have rebuilt my entire fuel system. I cleaned out my gas tank thinking it had water in it, and totally sealed the tank with RTV and found an old pressure cap so it will never allow water in. I have a new fuel line from tank to motor an even installed a fuel water separator. I replaced every single fuel line on the engine. I rebuild the fuel pump. I fully rebuilt the carburetors and got them absolutely spotless. Whatever engineer decided to put the main jet in the bottom of the bowl so it can clog with anything must have been high as a kite. Not only that, you need as special screwdriver to take it out. I made absolutely sure the floats are in spec. Its parallel when closed and fully extended is 3/4" from the carb body to front edge of the float. I made all new gaskets for the carb to reed cage, carb to air box, and air box cover. The reeds looked fine. The flywheel key is fine. Timing was never touched, but I did make sure to sync the carbs. New plugs and old plugs, no change. Compression is 152 psi in both cylinders exactly. Coils seem ok, both have the same resistance. Plug wires seem ok. CDI was replaced last year. I am pulling my hair out here.
The problem started about 4 months ago. One day it was running strange, but I figured it was the hot weather, as my motor runs a little rich in the high temps. It runs best when its about 40-50 degrees out. I never bothered with smaller jets, as I don't like summer fishing anyway. Around that time I broke my pull rope as this was a pull start only tiller motor. I bought a starter, and converted it to electric start. I'm handy with electronics, and have lots of wire, solenoids, and switches on hand. Electric start works amazing. It worked fine for almost a month but always seemed to blubber at idle, I still figured this was normal considering the 90+ temps. Eventually it got to the point of hard starting, and running lean at full throttle as indicated by the plugs. I cleaned the carbs good, but found no clogs. When I got it back together one carb bowl leaked, but I tried it anyway. This time It wouldn't even rev out. I figured it was a stuck float, and since it was leaking, time for a carb kit and full rebuild again. I got done with the rebuild, and its back to the original problem. It idles very rough and often one cylinder completely cuts out, but it will rev out fine. At this point the fuel system is completely out of the question, its all brand new as of today, and the motor still runs the same as it did a month ago. Compression is great, and the same it was 2 years ago. This brings me to ignition. I'll take any idea anyone has. I already checked the flywheel key, plugs, wires, and the coils seem ok. Maybe someone has a better test as the coils are kind of interconnected. I hate to think its the CDI, but I've never had one drag out like this. Its always been a quick death for a CDI. I was thinking to check timing, but I've never had to on an outboard before, and I'm not sure how to. I don't see why my automotive timing light wouldn't work.
The problem started about 4 months ago. One day it was running strange, but I figured it was the hot weather, as my motor runs a little rich in the high temps. It runs best when its about 40-50 degrees out. I never bothered with smaller jets, as I don't like summer fishing anyway. Around that time I broke my pull rope as this was a pull start only tiller motor. I bought a starter, and converted it to electric start. I'm handy with electronics, and have lots of wire, solenoids, and switches on hand. Electric start works amazing. It worked fine for almost a month but always seemed to blubber at idle, I still figured this was normal considering the 90+ temps. Eventually it got to the point of hard starting, and running lean at full throttle as indicated by the plugs. I cleaned the carbs good, but found no clogs. When I got it back together one carb bowl leaked, but I tried it anyway. This time It wouldn't even rev out. I figured it was a stuck float, and since it was leaking, time for a carb kit and full rebuild again. I got done with the rebuild, and its back to the original problem. It idles very rough and often one cylinder completely cuts out, but it will rev out fine. At this point the fuel system is completely out of the question, its all brand new as of today, and the motor still runs the same as it did a month ago. Compression is great, and the same it was 2 years ago. This brings me to ignition. I'll take any idea anyone has. I already checked the flywheel key, plugs, wires, and the coils seem ok. Maybe someone has a better test as the coils are kind of interconnected. I hate to think its the CDI, but I've never had one drag out like this. Its always been a quick death for a CDI. I was thinking to check timing, but I've never had to on an outboard before, and I'm not sure how to. I don't see why my automotive timing light wouldn't work.
