Hi all
I just changed the oil in my 94 monster and now she seems to be running real hot. I have had the bike since new and rebuilt her about six years ago: 944 kit, port and pollish, cams, valves, rods, lightened crank and flywheel, FCR41's etc. I have her jetted well and she has always run like a top... untill this oil change. Seems real hot, warm my but and legs while ridding hot. My first thought is that there is no cool oil flowing to the rear cylinder or even the front cylinder. Don't know. Any ideas?
I was told that there has to be stagger in an air-cooled twin engine. My wrench installed a 155 main in the horizontal cylinder and a 158 main in the vertical cylinder with my FCR's.
My jetting is the same as it has always been since I rebuilt here and I have six years and thousands of miles on that jetting. It has just started doing this with no changes. The oil in the window does go down when I run her. Any ideas on how else I can check my oil pressure and what would be a good way to check the temperatures of my cylinders?
There is a tool which you plug into where the oil pressure warning light switch is on the right side of the engine near the oil fill cap that can give you your actual pressure readings but I highly doubt that is your problem.
There are gauges with a probe/sensor that replaces the spark plug washer which will give you head temperatures.
Are you SURE its that much different than before? A couple of other causes of hot running is spark timing being severely off or extremely lean carb settings like if a piece of dirt got lodged in your main jet. How does it run? Same as before or is performance suffering as well?
I talked to a mechanic today and he thought the same thing, possibly something in the carb (dirt etc.) leaning it out. Another thing he mentioned was a tight exhaust valve. I will give the carbs a clean and then check the valves. Thanks all for your input.
This is a coincidence or something. I also took my 996 out yesterday and was consistently hitting 210 degrees every time I was at a stop light and or ridding gears 1-3. I have had the bike for 9 years, always maintained, and garaged and now all of sudden its running extremely hot. Any thoughts and or suggestions in troubleshooting before I have to take her in to the professionals is appreciated.
I believe he's referring to the screen tube mounted in the side of your motor. It catches the big pieces like gear teeth and valve collets. Just kidding.
Needs to be serviced when you change your filter.
As far as your heating issue is concerned, heating up at a stoplight is not really abnormal, is it? I'd be more concerned if this were happening while moving at speed.
As an example, I was flyin' along yesterday at around 150 (95 mph) for 10 minutes and the temp gauge was at 72C. Beautiful. Outside temp was 22C. Sorry for Celcius temps but I've forgotten how to convert back to Whitworth.
Hi all
I just changed the oil in my 94 monster and now she seems to be running real hot. I have had the bike since new and rebuilt her about six years ago: 944 kit, port and pollish, cams, valves, rods, lightened crank and flywheel, FCR41's etc. I have her jetted well and she has always run like a top... untill this oil change. Seems real hot, warm my but and legs while ridding hot. My first thought is that there is no cool oil flowing to the rear cylinder or even the front cylinder. Don't know. Any ideas?
Thanks, Fox
I know you would rather figure it out yourself, but hear me out. If I have a customer with a problem that he wants to tackle himself I will offer some dyno time to him on a day when I already have the dyno running.
We can check all lot of things while up on the dyno including A/F ratio, heat, and HP. At the least you get to know how well you are tuned even if there is no problem.
Overheating rear cylinder
01 - 996 Running Hot
Linear Mode
