What would the performance symptoms be when the float valves have failed. Seeing fuel spil into the carbs when priming with the bulbs is certainly a symptom. But, what would one experience in performance? e.g. failure to start, stalling, etc.?
I'm sorry I wasn't clear in my previous post. In this photo one can clearly see the color change. the clear vinyl tubing (temporary, I will be changing it out with black fuel hose) holds the premix with the typical blue green tint.
I am curious what would cause the change to the yellowish in...
Thank you for the advice. Please share how you would go about using a timing light to identify the high rpm drop out problem.
Also, I placed a clear fuel filter between the connector and the fuel pump. You can see in this photo that the color of the fuel changes to yellowish from blueish.
Do...
I held several discussions with tech support at CDI Electronics. Those guys are terrific; very friendly and helpful. CDI makes and sells a rectifier/regulator originally developed for Evinrude engines but work well with old Mercs as well. It does need another hole drilled for mount the part...
Thank you for your response. However, it is not clear to me that I could simply install a Mercury voltage regulator into the circuit. It did occur to me to install a voltage regulator but not that I could purchase one ready for installation. Nor do I know how to hook up an alternator/stator...
I changed out the fuel line from the port side connection directly to the fuel pump with clear vinyl tubing and a new bulb pump. No change to the performnace. I did notice fuel dripping out of the carbs when I tilted the engine up. It seems this happens when the bowls are full but the floats...
A while back I purchased an ELECTRONIC SPECIALTIES 328 EZ TACH + to work on my 1972 Mercury 650E 3cyl 2 stroke engine. Unfortunately, the settings don't align with a 3 cyl 2 stroke. I would like to use a laser tach.
If you can recommend a reasonably priced laser tach, I love to hear about it.
Ah yes... the infamous trigger. I rebuilt the distributor a while back after finding it was the culprit for no spark. No spark was the main issue when I first became the owner. The support from CDI was terrific as well as support from the forums.
As I recall, the trigger components on the...
If the issue is fuel starvation, why would the engine start so easily post stalling? And, at the second stall in the video, the engine doesn't stall entirely. It kicks back in on its own. Seems there is sufficient fuel available at the time of stalling.
I'm back after a couple year hiatus. Here's my story, it's sad but true... the last two cruises ended with engine problems. The first was a faulty ground connection on the battery terminal causing low voltage and a dead engine. I fixed that. The second time I was able to limp back to the launch...
I recently acquired a 1972 Mercury 650 3 cyl in pieces but attached to a 1970 Larson Lapline and on a trailer. A previous owner installed a CDI Electronics CDI switch box and coil. I replaced the coil and can get a spark manually by following the CDI Electronics troubleshooting instructions for...
