Very Hot Engine - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 14 (permalink) Old 05-09-2012, 12:31 PM Thread Starter
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Very Hot Engine

I've been looking through the posts on engine coolant and engine temperature as well as poor wiring affecting grounding which can prevent the shut-off the cooling fan.

My question is about engine temp and how to tell if the coolant & fan are functioning properly.

I can see the coolant rising (in reservoir) after a short ride and I can hear the fan shutting off 20 sec. after key is removed. The engine however seem extremely hot still.

Is there a safe temperature range the engine block should be in to maintain optimum performance? How hot is too hot? Does the temp gauge really tell me anything at the 50% mark?

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post #2 of 14 (permalink) Old 05-09-2012, 12:53 PM
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Dude you should be fine as long as yoj aren't in the red. I don't worry too much about specific temp because my engine is pretty much stock.
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post #3 of 14 (permalink) Old 05-09-2012, 01:05 PM
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If your gauge is not going past the halfway mark (basically pointing straight down) your bike is normal. Not sure why you think it's too hot, but they don't cool off that quick when you turn them off.

In stop and go traffic on a hot day the needle might move towards the red, but should go back down once you start moving.

Sounds like your fan is working fine too....

But.....have you checked your splines??

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post #4 of 14 (permalink) Old 05-09-2012, 02:12 PM
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Not certain about your engine, but mine is sexy hot!

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post #5 of 14 (permalink) Old 05-09-2012, 04:23 PM Thread Starter
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Cool. Thanks. I'll be checking splines soon.

2002 VN750 (First Bike)-Purchased:4/28/12 w/4750 miles
Took the 3 day BRC (Basic Rider Course)-Highly recommended!
DIY Guy
---------------------------
Added Spitfire Smoke Windshield
Re-keyed toolbox access panel
New Dunlop Tires
New Battery
Adding 4 oz. Seafoam/Tank - Good So Far.
Missing Swingarm Caps
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post #6 of 14 (permalink) Old 05-09-2012, 07:54 PM
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Make sure to bleed any air from the cooling system as well. Mine was running a wee hot at times, and as soon as I bled the air (as per manual and w/o removing tank), I almost never see the needle go above 1/3.



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post #7 of 14 (permalink) Old 05-10-2012, 05:35 PM
Crap, I WAS in 5th gear.
 
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The sides of th cylinders will definitely be over 150F (which is about one-thousand-one, ouch.) I will take some measurements with my non-contact heat gun when I get home. If your fan is cycling, you should be fine.
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post #8 of 14 (permalink) Old 05-11-2012, 02:43 PM
Crap, I WAS in 5th gear.
 
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I checked the sides of the cylinders when got home last night. They were about the same temp as he coolant ~185F or so.
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post #9 of 14 (permalink) Old 05-11-2012, 11:14 PM Thread Starter
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Thank you all. I will check these recommendations this weekend.

2002 VN750 (First Bike)-Purchased:4/28/12 w/4750 miles
Took the 3 day BRC (Basic Rider Course)-Highly recommended!
DIY Guy
---------------------------
Added Spitfire Smoke Windshield
Re-keyed toolbox access panel
New Dunlop Tires
New Battery
Adding 4 oz. Seafoam/Tank - Good So Far.
Missing Swingarm Caps
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post #10 of 14 (permalink) Old 06-11-2012, 11:07 AM
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Could someone tell me how often the fan is supposed to come on? I can't tell if it's on when I'm riding. It seems to only come on after I turn off the bike. It will kick in about 5 seconds after I turn off the engine, then it runs for a bit. Is this normal???

My bike seems to be running hot. I was in a lot of traffic this weekend, but it was only 75 degrees out, and the needle was all the way up to the red line. I've never seen it that hot before. I forgot to bleed the air out of the system when I put coolant back in after I pulled the engine. Is this most likely the reason??



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