KX500 water pump modification

Dirt Bike Technical discussion. This is for a little more in depth discussions :-)
User avatar
Sandblaster
Posts: 5698
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX500 water pump modification

Post by Sandblaster » Wed Jul 30, 2014 2:08 am

Yesterday I took the Supermoto out for about a hour ride.
It was 95F out, don't know the humidity.
It was about 30% in town and about 70% twisty hwy with a posted speed limit of 55 mph :?
Since my last post I changed a few things on my bike.
I did a complete bottom end rebuild with a IMS pro rod that was rebuilt, welded, trued, and balanced.
The transfers, ports, and bridges were cleaned up.
The head has a squish change.
The port timing is stock.
The piston is a Wossner windowed piston.
I also have the Motorrad coolant passage clean ups and water pump impeller clearance mod.
I am also running Chinese Radiators.
So basically I'm running the factory engine that Kawasaki should have built excluding the exhaust port work that I couldn't do without re-plating the cylinder :D
It is definitely faster then stock and way smoother...
Also running 50/50 antifreeze
My running temps were as follows
Water after cooling 143-147F
Head temps 190-199F
So I'm definitely headed in the right direction.
I'll be trying some Royal Purple with distilled water later this week.
I'll note any changes I find 8-)
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 5698
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX500 water pump modification

Post by Sandblaster » Tue Aug 05, 2014 6:08 pm

Can you believe it that with 3 Royal Purple dealers (Napa) in our area there is no Purple Ice on the shelf?
They are suppose to get some this afternoon.
It will be hot again today so it will be a perfect test.
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 5698
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX500 water pump modification

Post by Sandblaster » Tue Aug 05, 2014 6:16 pm

Here is a link to Royal Purples FAQ's.
http://www.royalpurpleconsumer.com/reso ... urple-ice/

Here is a question that I have seen many times on the Internet:

How much Purple Ice do I need to add to my cooling system?

When using Purple Ice with an antifreeze/water mix, Royal Purple recommends adding 1 ounce of Purple Ice per quart of cooling system capacity. For straight water (racing) applications, Royal Purple recommends adding 2 ounces of Purple Ice per quart of cooling system capacity.

Here is another:
How often should I add Purple Ice to my radiator?

When used with antifreeze, Purple Ice should be added once a year or every 30,000 miles, whichever comes first, in order to maintain proper performance. When using Purple Ice in a cooling system running straight water, Purple Ice should be added once a year or every 15,000 miles, whichever comes first.

And another:
What Water/antifreeze concentration is recommended when using Purple Ice radiator conditioner:

Purple Ice may be added to any antifreeze/water mix; however, testing has shown higher water concentrations yield greater cooling benefits. While Purple Ice does contain corrosion inhibitors as well as lubricity to compensate for a lower antifreeze/water concentration, Royal Purple recommends a minimum of 20 percent antifreeze concentration be used in street-driven vehicles. Purple Ice has no effect on the boiling and/or freezing point of water, so an appropriate antifreeze/water mix ratio for the cold temperatures in your area must still be used.
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 5698
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX500 water pump modification

Post by Sandblaster » Tue Aug 05, 2014 10:33 pm

Purple Ice before mixing...
Royal Purple Purple Ice 1.JPG
Royal Purple Purple Ice 1.JPG (59.7 KiB) Viewed 2581 times
I am going to use the race mix at 2 oz per 1 quart of water.
If I didn't maintain my bike so well... Cough Cough... I would add 20% green stuff.
Since the race mix is good for 15,000 miles I'm sure it will work just fine for me :D
After mixing:
Royal Purple Purple Ice 2.JPG
Royal Purple Purple Ice 2.JPG (37.99 KiB) Viewed 2581 times
Not much of a color change but what would yo expect at 1:64 ratio :D
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 5698
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX500 water pump modification

Post by Sandblaster » Wed Aug 27, 2014 3:36 am

Results...

85F
Humidity 32%
Rode for about 15 minutes around town.
Head was 163F
Post cooled water was 141F
Jumped on a back road (Right next to a hospital) at rode at a little past 90 mph for about a mile.
Made a U turn and did it again.
Head was 176F
Post cooled water was 149F

So far.... I like this stuff... :D
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 5698
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX500 water pump modification

Post by Sandblaster » Wed Aug 27, 2014 3:46 am

Now for a quick recap.
I did the water pump impeller clearance mod.
I cleaned up all the water passages.
Cleaned up oil passages in the cases.
I have a re-cut head.
Chinese Rads.
Stock port timing.
Cleaned up cylinder transfers, ports, and bridges.
Balanced crank.
Wossner windowed piston.
VF2 Reed with modded boot.
41mm carb jetted a bit rich at the moment.
Running 1 quart of distilled water per 2 oz of Royal Purple's Purple Ice (Bought it at Napa).
MZB ignition with a flywheel that is 1lb lighter then stock.
My bike has never ran so cool and with so much smooth power.
Time to start another build with some advanced port timing :-o
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 5698
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX500 water pump modification

Post by Sandblaster » Tue Dec 16, 2014 6:13 am

I was asked about radiator flow direction so I figured this was a good spot to throw in a flow chart.... Pun intended... :shock:
RADIATOR FLOW.png
RADIATOR FLOW.png (7.3 KiB) Viewed 2434 times
If bikes are for kids I'll never grow up.

Autoparts
Posts: 3
Joined: Fri Dec 12, 2014 8:58 am

Re: KX500 water pump modification

Post by Autoparts » Mon Jan 12, 2015 9:16 am

If you're filling up your turbocharged Mustang with 87, you deserve less power as it should be clear that such a motor wants to drink the good stuff. Yes, the car is capable of running on 87 with no issues, but just be ready to be a bit slower. This is why you see disclaimers in car ads, because automakers get their best horsepower ratings when they run higher-test fuel.

User avatar
Sandblaster
Posts: 5698
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX500 water pump modification

Post by Sandblaster » Tue Oct 06, 2015 11:53 pm

New impeller :o
KX500 COOLING 101.JPG
KX500 COOLING 101.JPG (69.9 KiB) Viewed 2184 times
KX500 COOLING 102.JPG
KX500 COOLING 102.JPG (83.62 KiB) Viewed 2184 times
If bikes are for kids I'll never grow up.

Post Reply

Return to “Dirt Bike Technical discussion”

Who is online

Users browsing this forum: No registered users and 1 guest