Complete radiator service -Thermostat mod - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 11 (permalink) Old 08-14-2013, 08:47 AM Thread Starter
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Complete radiator service -Thermostat mod

Hi Guys, my bike is about 10+ yrs old and the cooling system is pretty screwed up, ive removed the entier cooling system and been servicing it radiator, pipes, pump, thermostat

my thermostat is in a pretty bad condition corroded, rusted and ive decided to repalace it and made a purchase of a used one, the part arrived in a pretty good condition but it dosent have the internal valves(all those springs and valve parts).

can i fix it without the valves inside, i guess this should improve the cooling as the thermostat is always open and the coolant should flow freely.

Images attached..

Cheers Guys.
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post #2 of 11 (permalink) Old 08-14-2013, 12:19 PM
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Looks like you got the thermostat housing only.
You'll need to get the actual thermostat and a possibly a new O-ring to make it complete.
Items #2 and #16.

http://www.mrcycles.com/fiche_sectio...02&fveh=132163
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post #3 of 11 (permalink) Old 08-14-2013, 07:47 PM
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Are parts hard to get where you live?
You can test the old thermostat you already have.
Personally, I would replace it, but if access to parts is a problem...


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post #4 of 11 (permalink) Old 08-14-2013, 08:53 PM Thread Starter
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What about just using it without the internal valves will that aid in easier flow and run cooler ?

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post #5 of 11 (permalink) Old 09-30-2013, 10:19 AM
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No. Running an engine without a thermostat installed will cause the engine to run hotter. The thermostat stays closed long enough for the bike to get up to operating temps. Then when it opens, it acts like a regulator to slow the flow of water down a bit. If the water rushes through the radiators too rapidly; it will not properly cool. We run a restrictor in our race car engines and no thermostat, but I'm not sure how this would work on an RC.
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post #6 of 11 (permalink) Old 09-30-2013, 11:50 AM
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Thermostats are there to regulate coolant up until the bike is at running temp. After that, the radiators, fans and radiator cap are in charge of keeping things under control.

Without a thermostat, your bike will take forever to get up to temp and will run like shit and you'll probably foul your plugs.




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post #7 of 11 (permalink) Old 09-30-2013, 02:44 PM
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Quote:
Originally Posted by b.miller123 View Post
Thermostats are there to regulate coolant up until the bike is at running temp. After that, the radiators, fans and radiator cap are in charge of keeping things under control.

Without a thermostat, your bike will take forever to get up to temp and will run like shit and you'll probably foul your plugs.
This^^^

The thermostat is there to keep your bike warm, not cool.

The OP did need a new housing, but the new one came without the thermostat. Depending on how it looks, it may be OK to re-use. just test it in a pot of boiling water. it whould open up as the water starts to boil, and close when taken out of the water.
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post #8 of 11 (permalink) Old 09-30-2013, 10:00 PM Thread Starter
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Ive tested this out for about a month now and im not very happy about the cooling performance without the thermostat I believe the water dosent spend enough time in the radiators to cool it down

What I feel is the bike takes longer time to heat up but then when it heats above 100 centg the cooloing isnt efficent and can flux betw 110 to 130 and takes increased amt of time to cool down after peeking on high temps

Im gona put the thermostat back this weekend
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post #9 of 11 (permalink) Old 09-30-2013, 10:28 PM
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I would definitely put the thermostat back in for sure! Its not meant to run right without one. It will never get up to temp.

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post #10 of 11 (permalink) Old 09-30-2013, 10:36 PM
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samuelprn, are your temp figures Fahrenheit or Celsius?

100 C = 212 F

110 C = 230 F

130 C = 266 F

Of course if your figures are in Fahrenheit, man that thing is running cold!
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