First Post! '83 VT750 Project - Honda Shadow Forums : Shadow Motorcycle Forum
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post #1 of 18 (permalink) Old 05-15-2019, 10:18 PM Thread Starter
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First Post! '83 VT750 Project

Hey all! I just got back on two wheels with an '83 Shadow that someone didn't wanna put the work into to get running. Well....I got her running good and boy does it feel good. However it does have a little issue overheating at stoplights. The gauge climbs all the way pass the H but drops back to just above the middle when I get some speed. Summer in California is brutal so i'd like to get it sorted out ASAP. So far it seems the water pump is flowing however there is no thermostat. The fan is on a manual switch but only helps a little bit anyways. I haven't seen any coolant boil out yet but id like to be sure everything is okay so maybe y'all can help me.

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post #2 of 18 (permalink) Old 05-15-2019, 10:54 PM
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Welcome to the forum.
Is the fan turning the right way? That sounds weird but if someone has rewired it they may have the polarity reversed and it is pushing out instead of in.

Also is the coolant clean or very rusty? Maybe it needs a good flushing with water and new coolant.
If you take the radiator off you can do a home made flow test and see if the radiator can pass water out about as fast as you can pour it in the top.


Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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post #3 of 18 (permalink) Old 05-16-2019, 05:03 PM Thread Starter
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Welcome to the forum.
Is the fan turning the right way? That sounds weird but if someone has rewired it they may have the polarity reversed and it is pushing out instead of in.

Also is the coolant clean or very rusty? Maybe it needs a good flushing with water and new coolant.
If you take the radiator off you can do a home made flow test and see if the radiator can pass water out about as fast as you can pour it in the top.
Thanks for the reply! The fan appears to be spinning the right way. The coolant was clean-ish compared to some other bikes ive seen but i currently have coolant flush running through the system so i'll get back to you on that after i try that radiator trick too.
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post #4 of 18 (permalink) Old 05-16-2019, 06:59 PM
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Are you planning on putting a thermostat in it so it can control the fan, or is the plan to just keep controlling the fan with an on/off switch?
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post #5 of 18 (permalink) Old 05-16-2019, 07:02 PM
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Originally Posted by GhettoPistachio View Post
Thanks for the reply! The fan appears to be spinning the right way. The coolant was clean-ish compared to some other bikes ive seen but i currently have coolant flush running through the system so i'll get back to you on that after i try that radiator trick too.

Which way is that?
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post #6 of 18 (permalink) Old 05-16-2019, 08:52 PM
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Originally Posted by GhettoPistachio View Post
Thanks for the reply! The fan appears to be spinning the right way. The coolant was clean-ish compared to some other bikes ive seen but i currently have coolant flush running through the system so i'll get back to you on that after i try that radiator trick too.

What is 'clean-ish'?
Does that mean you can't tell what color it originally was? If so, it's a sign of a rusted up coolant system that a flush may not repair.
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post #7 of 18 (permalink) Old 05-16-2019, 09:18 PM Thread Starter
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The fan is spinning counter clockwise. It’s pulling the air. I’m putting in a new thermo switch today to control the fan. And when I say the coolant is clean-ish I mean it was still green with a very slight hint of brown. I’ve seen worse on cars but I don’t know how well that translates to bikes.
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post #8 of 18 (permalink) Old 05-16-2019, 10:17 PM
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Another test of a clogging radiator is get it well warmed up and shut it off, and run your hand back and forth across the radiator fins to see if they are about equally warm across. No cold spots.

Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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post #9 of 18 (permalink) Old 05-17-2019, 06:24 AM
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Quote:
Originally Posted by GhettoPistachio View Post
The fan is spinning counter clockwise. Itís pulling the air. Iím putting in a new thermo switch today to control the fan. And when I say the coolant is clean-ish I mean it was still green with a very slight hint of brown. Iíve seen worse on cars but I donít know how well that translates to bikes.

Please excuse my persistence, but clockwise/counterclockwise depends entirely on which end of the bike you are looking at. And when you say it's pulling air, they all pull air, no matter if it's spinning correctly or incorrectly.


Where exactly is the air being directed to.
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post #10 of 18 (permalink) Old 05-17-2019, 12:57 PM
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Since it sits behind the radiator, it should turn in a direction that pulls air through the radiator, from the front, and pushes it out toward the engine. I feel hot air blowing on my leg if sitting at a stop on a hot day.
My 1983 750 turns in the counter-clockwise direction looking from the engine side.


Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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