Thermostat @ H when going over 50mph?
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Thermostat @ H when going over 50mph? - 4/15/2006 10:12:41 AM
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oliversta
Posts: 42
Joined: 2/5/2006
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1987 Honda 600F Hurricane, just got carb cleaned, new fork seals, new brakes done....
When I left the repair shop, test rode it around the neighborhood, runs great like new! But... When I hit the highway going 50+ mph, my Thermostat needle jumped from near the C right over to the border line of the H,
When I finally got home, checked for any leaks, there were none, but can smell some antifreeze and very little smoke came from the bike.
Does anyone have any suggestions?
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RE: Thermostat @ H when going over 50mph? - 4/15/2006 10:55:42 AM
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anthonyd5189
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Well Im really new to the motorcycle world so I cant tell you for sure, but knowing things about cars, I would say you have a leak. If you can smell antifreeze its coming out somewhere. If your 100% sure its not a leak, make sure the thermostat works properly. If it's neither of those, I would take it in and have it checked out. Better to be safe than to have to buy a new engine cause you over-heated and blew yours.
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RE: Thermostat @ H when going over 50mph? - 4/15/2006 4:28:26 PM
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mikecranb
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Joined: 4/14/2006
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If you have or know someone who has a temp gun shoot the engine to see what the temp is. If its under 180 or close to that after running your guage or sending unit could be bad. Im not a bike tech but know how guages work and if it was overheating the guage would climb at a slow steady rate and it should happen after minutes of idling also. Smelling antifreeze is not good though.
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RE: Thermostat @ H when going over 50mph? - 4/19/2006 10:42:34 AM
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oliversta
Posts: 42
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I "burped" the cooling system, I took the radiator cap off, drained the coolant system and a reddish pink substance came out, (not coolant color), must of been old coolant, wonder why it's reddish? anyways, hit the throttle to 4-5 rpms 4-5 times and refilled coolant at the radiator cap and put back radiator cap, took it for a ride and instead of heating to the "H" in 5 minutes, it took me about 10 minutes. I've been told to check the Thermostat, any other suggestions on what it could be?
Thanks.
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RE: Thermostat @ H when going over 50mph? - 4/19/2006 2:53:19 PM
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anthonyd5189
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Is there enough air getting to the engine? Other than that I cant think of anything.
So overall here are the things I can think of:
1. Leak
2. Bad thermostat
3. Engine is actually overhearting
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RE: Thermostat @ H when going over 50mph? - 4/19/2006 3:20:16 PM
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rrasco
Posts: 5574
Joined: 3/6/2006
From: San Antonio, TX
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you know, my temp gauge normally reads right above the C, when i took a ride out of town the other day, once i would hit 70+ the needle started jumping from C - H and back down very very rapdily. i am sure this was just a malfuncion, one thing i did notice was there is a terminal connector that connects from the radiator, lower left corner sitting on the bike. mine had come off, i have not had a chance to check this to see if that is what was causing my problem or not since i cant ride my bike right now, but thought maybe you want to check something like that.
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RE: Thermostat @ H when going over 50mph? - 4/19/2006 4:01:35 PM
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oliversta
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Yeah I had a good idea for checking for leaks last night when I opened up the bike and drained the cooling system, Question: If it is the Thermostat - what exactly am I looking for? and if I need to replace it do I need a special one for my 1987 Honda CBR600f Hurricane?
Appreciate all your advice
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RE: Thermostat @ H when going over 50mph? - 5/4/2006 10:25:32 PM
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brian
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Do bikes have water pumps? I'm pretty sure when a car does that its the pump, (tyhe wild temps), mine goes fron just above c then to about 1/2 then once I start to ride it goes back to just above c. Also while were on the subject, in my dirt I use this specialized coolent, can you do the same on sport bikes?
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RE: Thermostat @ H when going over 50mph? - 5/5/2006 11:09:18 AM
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rrasco
Posts: 5574
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From: San Antonio, TX
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dont know about the coolant, but yes bikes have water pumps too. and when i put that tab back on my radiator, my temp gauge stopped jumping.
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RE: Thermostat @ H when going over 50mph? - 5/5/2006 5:24:53 PM
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oliversta
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Ok, I "burped" the system by draining the old coolant fully and revving the throttle 4-5 times w/o any coolant in it, then filled it w/ 50/50 coolant like it said in the manual, and in the manual, it just says to check the thermostat, so I opened up the bike again and I have the thermostat, but I have no clue what to look for, can anyone help with this?
Thanks
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RE: Thermostat @ H when going over 50mph? - 5/5/2006 6:26:08 PM
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eristole
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quickest way to check the thermo is to drop it in some hot water(ie boil some water.)...
if she opens it's good. if not. you need a new one.
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RE: Thermostat @ H when going over 50mph? - 5/5/2006 6:29:48 PM
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michigan_313
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do you have a owners manual (small booklet) or repair manual. if it tells you to check thermostat, my guess is it is asking you to look at the guage on the instrument panel to see that it stays in the nominal area.
if you have a repair manual it will tell you how to check to see if the thermostat is working. you will need a meter for this.
the thermostat is located under the fill neck assembly. you would have to unscrew the fill neck to get to it. if you already knew this, then sorry to rehash. there is also the thermastat switch located on the left side of the radiator. then there is the water pump located just under the front sprocket cover.
you can get any of these parts at honda motorcycle dealer. hell, they may even have them at the car dealership knowing honda.
the thermostat switch is tied to the rad fan. if the rad fan kicks on then it is not your switch. part eliminated.
okay, you say temp guage jumps from c - h after x minutes. you need to see if guage is working properly and check thermostat. if you don't have repair manual, reply back and i will post procedure.
now you also smell antifreeze. could it be from overfill running down exhaust manifold? do you see wetspots anywhere along any of the hoses, left and right side of cylinder entry. any semi-dry or discolored spots anywhere on the engine. are they fuel from tank and carbs or rad fluid? sometimes, one looks just like the other. if not sure about a spot get brake cleaner and spray area clean, then check again. there are two chome elbows, one on each side behind the cylinder bank, bolted to the block using a captive plate. check to make sure those are not leaking. if they are, then the o-ring seals need to be replaced. if leaking could also cause air to leak into cooling system.
will guage jump if you let bike idle. or only when moving. if moving, maybe something is getting vibrated or bumped loose?
do all wire contacts look clean and fitting tightly. thermostat switch, connections to guage cluster? if not, maybe loose or corroded connector.
you saw pink fluid come out of radiator? that quite possibly is water wetter. it looks like watered down lavatory soap in a small bottle. i use it myself along with antifreeze. this should not cause what you are describing.
if after all fluid has been replaced and air has been purged from system, then my guess is thermostat is working. it would have to in order for remainder of rad fluid to enter system. let's for example say that the complete cooling system takes total 1 gallon of coolent. you fill till it can't take anymore, say 3/4 gal., then you start engine. engine runs, you see a few small bubbles, engine starts to rise above "c", then thermostat is supposed to open and maybe rad fan starts to kick in. now, you start to see the coolent burbling and then level sink. so you start to add remainder of gallon, watch it burble somemore and then it stops, fan is still on and no leaks. now, at this point, the rad fluid is supposed to be cycling because the thermostat is open. if this is the case then thermostat is most likely okay.
last option is the temp guage. i would have to look in repair manual on how to check.
this is about a logical and step by step process as i can provide, i hope it helps you out. as i said before, if you want to know how to check the items with a meter, reply back.
matt
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RE: Thermostat @ H when going over 50mph? - 5/9/2006 1:30:57 PM
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oliversta
Posts: 42
Joined: 2/5/2006
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There are no leaks, I don't smell anitfreeze anymore after I drained the coolant system... I am going to take off the thermostat and need some help on what do with it, I do have the manual and it says I need to get a meter, so I'm looking into buying one, any suggestions on where to buy one?
Appreciate your replies and advice,
Ollie
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RE: Thermostat @ H when going over 50mph? - 5/15/2006 3:37:09 PM
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michigan_313
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Joined: 2/24/2006
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radio shack. or any place that sells electronic hobby stuff (ham radio, electronic parts, etc.)
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RE: Thermostat @ H when going over 50mph? - 5/16/2006 4:42:35 PM
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oliversta
Posts: 42
Joined: 2/5/2006
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Ok, I took off the thermostat and suspended it in boiling water, it didn't open at all, it's also rusted shut....As I was calling around for Thermostats most of the places said they would have to order it and would be delivered in a couple of days or so, and all the guys I spoke to said the bike can actually run without the Thermostat....
So I been riding it a couple of days without the Thermostat in the bike and it's actually been staying cooler. Just wanted to know how long I can do without the Thermostat? I do understand now the purpose of the Thermostat was to allow the coolant through the system, and now I just have coolant running through all the time. So is it safe to have the Thermostat out? and if not, how long can I ride without it?
Thanks
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