V7Goose
06-17-2009, 07:45 PM
I thought I'd post a few comments for those who have not been through this before. It is not hard as long as you have the proper tools. T-handle allen wrenches are almost mandatory for me - they make turning out the many socket head screws fast and easy. In addition, if you follow the manual (Method #1 below), you really want a set of long ball-end 3/8" drive allen wrenches for use with your ratchet.
If you follow the shop manual, the job is pretty straight forward, but you will have one frustrating surprise. I have detailed the full drain procedure first as Method #1, then two slightly modified procedures that some might prefer at the expense of not getting out quite as much of the old coolant.
The first steps apply to all three methods: You start by removing the seat, tank, both lower fairings and all three battery covers. Don't forget to remove that top center #3 Philips screw on the middle cover; it is kind of hidden! The cover slips out to the left fairly easily, but you do need to watch down in the middle for hoses and wire bundles that will hang up on the corners. Now you are ready to begin draining the fluid.
METHOD #1 - The Complete Drain:
The radiator drain bolt is obvious on the bottom left, and getting the overflow tank out is pretty easy too. It is only held on by one bolt and a couple of lugs in rubber grommets. Just use your fingers to push that plastic shield above it up so you can pull the filler neck forward and out to the right side. Some folks prefer to siphon out the overflow tank instead of removing it, but I don't know why; taking it out is MUCH easier than messing with a siphon hose! (But you don't have to remove the center or left side battery covers if you are not going to remove the tank.) Note: If you remove the radiator cap before you take out the radiator drain bolt, the coolant will drain VERY fast with quite a bit of splashing; you may want to let it drain mostly on it's own before you take that cap off!
Next you will want to pull the fake cylinder fins off and take out the rubber plugs; use an old spark plug to screw into the plug and pull it out. Each cylinder water jacket holds quite a bit of coolant - seemed like about 1/2 cup each but could have been less - and those fin covers pop off very quickly with a 5mm T-handle. Make sure you leave the right front cover off until you finish with the next step!
The frustrating surprise will come when you try to drain the water pump. The drain plug is a 17mm plug angled forward in the bottom of the chrome water pump cover, right next to the bend in the header pipe. The service manual says absolutely nothing about this other than to just take out the plug. Good LUCK! Absolutely no way to get on it with normal tools unless you loosen the header pipe. :starz: The good news is that you don't have to actually remove the pipe, just loosen the clamp at the front of the Y joint and remove the two socket head nuts on the header clamp (this is where you will really appreciate the long ball-end allen wrenches for your ratchet!). Once the header pipe is loose enough to pull a bit to the outside near the floor board, it is easy to remove the drain plug with a normal 17mm socket and a wobble extension or u-joint.
Now you are ready to put all the drain plugs back in and replace the fin covers (make sure to get that header pipe back in place before you put the right front cover on!). DO NOT over tighten the radiator drain plug - that is all plastic, and the torque spec is ONLY 22 inch pounds. Even with the proper torque wrench, that is so light you can't hardly tell it has clicked, so you could still easily over-tighten and damage it. To me, the right tightness seems to be about what you can do just with your hand on a long 3/8" extension WITHOUT the ratchet.
That's it. Only thing left is to mix up 3.5 liters of 50/50 coolant and fill the overflow reservoir to the FULL line, then carefully fill the radiator to the top of the neck. Put the radiator cap back on and run the engine for a minute or so (plenty of fuel in the carbs to do this without the tank) to let the coolant settle, then top off the coolant at the radiator cap. Now put it all back together and take your bike out for a short ride to get the motor fully up to temperature and check for leaks. Then after it completely cools off, check the overflow tank and top up to the Full mark if necessary (if there were any air-pockets left when you filled the coolant, some of the fluid from the overflow tank will be sucked in as the engine cools).
METHOD #2 - Skipping the Water Pump Drain (almost as good as #1):
Several folks have said they prefer to just drain the radiator and try to flush the rest of the coolant out with distilled water (see posts below), so I include these corner-cutting options as Methods 2 & 3.
Drain the radiator and overflow tank as in #1.
Now refill the radiator with distilled water (about three liters) and run the engine for at least two minutes. This will not be long enough to heat up the coolant and open the thermostat, but enough coolant will circulate through the vent hols in the thermostat to mostly clear out the water pump and leave only distilled water in it.
RE-drain the radiator.
Now pull each of the fake fin covers and pop out that little rubber plug. You will notice that coolant that drains from each water jacket still seems bright green, showing the "flush" was incomplete (that's why you are still doing these plugs).
With the radiator plug back in and the fin covers back on, it is time to refill with coolant. But this time you have left some distilled water or highly diluted coolant in the engine, so it is best to not use pre-mixed coolant. Add about 1.75 liters of straight coolant, some to the overflow tank (1/2 full) and the rest to the radiator. Now top up both with distilled water and run the engine for a minute to work out any air pockets, then re-top the radiator with distilled water.
METHOD #3 - Short and Sweet and Hope For The Best:
In this method you skip draining both the water pump AND the cylinder water jackets. You will be leaving some of the old coolant in there to mix with the new, but some folks find this OK.
Drain the radiator and overflow tank as in #1.
Now refill the radiator with distilled water (about three liters) and run the engine for at least two minutes. This will not be long enough to heat up the coolant and open the thermostat, but enough coolant will circulate through the vent hols in the thermostat to mostly clear out the water pump and leave only distilled water in it.
RE-drain the radiator and flush it again just like above.
After two flushes you probably noticed a much lighter green color to the water on the last drain, so it is time to add new coolant and button it all back up. But remember, not only are you leaving some water/coolant in the water pump, you are also leaving it in the water jackets too, so you need to use a lower amount of new coolant in the fill. My guess of the right mix would be to add only 1.25 liters of coolant and then top it all off with distilled water.
That's it folks, all done for another couple of years! My personal choice is Method #1. Even with the need to loosen the header pipe, it really isn't that difficult, and it doesn't take any more time than adding the engine flushes on the other methods. But whichever method you use, it is certainly better than not changing it at all. So now that the maintenance is done, let's rack up some miles!
Enjoy the ride! :thumbsup2:
Goose
If you follow the shop manual, the job is pretty straight forward, but you will have one frustrating surprise. I have detailed the full drain procedure first as Method #1, then two slightly modified procedures that some might prefer at the expense of not getting out quite as much of the old coolant.
The first steps apply to all three methods: You start by removing the seat, tank, both lower fairings and all three battery covers. Don't forget to remove that top center #3 Philips screw on the middle cover; it is kind of hidden! The cover slips out to the left fairly easily, but you do need to watch down in the middle for hoses and wire bundles that will hang up on the corners. Now you are ready to begin draining the fluid.
METHOD #1 - The Complete Drain:
The radiator drain bolt is obvious on the bottom left, and getting the overflow tank out is pretty easy too. It is only held on by one bolt and a couple of lugs in rubber grommets. Just use your fingers to push that plastic shield above it up so you can pull the filler neck forward and out to the right side. Some folks prefer to siphon out the overflow tank instead of removing it, but I don't know why; taking it out is MUCH easier than messing with a siphon hose! (But you don't have to remove the center or left side battery covers if you are not going to remove the tank.) Note: If you remove the radiator cap before you take out the radiator drain bolt, the coolant will drain VERY fast with quite a bit of splashing; you may want to let it drain mostly on it's own before you take that cap off!
Next you will want to pull the fake cylinder fins off and take out the rubber plugs; use an old spark plug to screw into the plug and pull it out. Each cylinder water jacket holds quite a bit of coolant - seemed like about 1/2 cup each but could have been less - and those fin covers pop off very quickly with a 5mm T-handle. Make sure you leave the right front cover off until you finish with the next step!
The frustrating surprise will come when you try to drain the water pump. The drain plug is a 17mm plug angled forward in the bottom of the chrome water pump cover, right next to the bend in the header pipe. The service manual says absolutely nothing about this other than to just take out the plug. Good LUCK! Absolutely no way to get on it with normal tools unless you loosen the header pipe. :starz: The good news is that you don't have to actually remove the pipe, just loosen the clamp at the front of the Y joint and remove the two socket head nuts on the header clamp (this is where you will really appreciate the long ball-end allen wrenches for your ratchet!). Once the header pipe is loose enough to pull a bit to the outside near the floor board, it is easy to remove the drain plug with a normal 17mm socket and a wobble extension or u-joint.
Now you are ready to put all the drain plugs back in and replace the fin covers (make sure to get that header pipe back in place before you put the right front cover on!). DO NOT over tighten the radiator drain plug - that is all plastic, and the torque spec is ONLY 22 inch pounds. Even with the proper torque wrench, that is so light you can't hardly tell it has clicked, so you could still easily over-tighten and damage it. To me, the right tightness seems to be about what you can do just with your hand on a long 3/8" extension WITHOUT the ratchet.
That's it. Only thing left is to mix up 3.5 liters of 50/50 coolant and fill the overflow reservoir to the FULL line, then carefully fill the radiator to the top of the neck. Put the radiator cap back on and run the engine for a minute or so (plenty of fuel in the carbs to do this without the tank) to let the coolant settle, then top off the coolant at the radiator cap. Now put it all back together and take your bike out for a short ride to get the motor fully up to temperature and check for leaks. Then after it completely cools off, check the overflow tank and top up to the Full mark if necessary (if there were any air-pockets left when you filled the coolant, some of the fluid from the overflow tank will be sucked in as the engine cools).
METHOD #2 - Skipping the Water Pump Drain (almost as good as #1):
Several folks have said they prefer to just drain the radiator and try to flush the rest of the coolant out with distilled water (see posts below), so I include these corner-cutting options as Methods 2 & 3.
Drain the radiator and overflow tank as in #1.
Now refill the radiator with distilled water (about three liters) and run the engine for at least two minutes. This will not be long enough to heat up the coolant and open the thermostat, but enough coolant will circulate through the vent hols in the thermostat to mostly clear out the water pump and leave only distilled water in it.
RE-drain the radiator.
Now pull each of the fake fin covers and pop out that little rubber plug. You will notice that coolant that drains from each water jacket still seems bright green, showing the "flush" was incomplete (that's why you are still doing these plugs).
With the radiator plug back in and the fin covers back on, it is time to refill with coolant. But this time you have left some distilled water or highly diluted coolant in the engine, so it is best to not use pre-mixed coolant. Add about 1.75 liters of straight coolant, some to the overflow tank (1/2 full) and the rest to the radiator. Now top up both with distilled water and run the engine for a minute to work out any air pockets, then re-top the radiator with distilled water.
METHOD #3 - Short and Sweet and Hope For The Best:
In this method you skip draining both the water pump AND the cylinder water jackets. You will be leaving some of the old coolant in there to mix with the new, but some folks find this OK.
Drain the radiator and overflow tank as in #1.
Now refill the radiator with distilled water (about three liters) and run the engine for at least two minutes. This will not be long enough to heat up the coolant and open the thermostat, but enough coolant will circulate through the vent hols in the thermostat to mostly clear out the water pump and leave only distilled water in it.
RE-drain the radiator and flush it again just like above.
After two flushes you probably noticed a much lighter green color to the water on the last drain, so it is time to add new coolant and button it all back up. But remember, not only are you leaving some water/coolant in the water pump, you are also leaving it in the water jackets too, so you need to use a lower amount of new coolant in the fill. My guess of the right mix would be to add only 1.25 liters of coolant and then top it all off with distilled water.
That's it folks, all done for another couple of years! My personal choice is Method #1. Even with the need to loosen the header pipe, it really isn't that difficult, and it doesn't take any more time than adding the engine flushes on the other methods. But whichever method you use, it is certainly better than not changing it at all. So now that the maintenance is done, let's rack up some miles!
Enjoy the ride! :thumbsup2:
Goose