Water pump spur gear

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60something
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Joined: Sat Mar 03, 2018 6:45 pm
Location: Midwest USA

Water pump spur gear

Post by 60something » Sat Mar 17, 2018 11:28 pm

I hope I'm not wearing out my welcome here, but I said I'd have a thousand and one questions... I have finally got busy on my K5 in earnest and keep finding stuff that should be replaced. :o Anyway, on close inspection, I found the water pump spur gear on the crankshaft has some damage. The dufus that welded the clutch cover had too much buildup, and that weld buildup rubbed the clutch and apparently all those pieces running through the gears had a snowball effect, as there were some chunks out of gear teeth, which got into other gears, etc etc. Problem is, I already sent my crank out to be rebuilt and now I'm leary about getting that pressed in gear out without damaging anything on the crank. I found some posts on (I think) KX Rider about removing the gear and just wanted to get it from the Guru. Is it relatively easy to remove by heating the crank end and cooling the gear? The damage to the gear is minor, but I think I'd rather be done with it and replace it and the mating gear.
I don't know half of you half as well as I should like, and I like less than half of you half as well as you deserve.

2006 KDX200 qty-2
1987 KX500
1991 CB750 Nighthawk
1973 H2 750 Triple - gone but not forgotten

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Sandblaster
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Re: Water pump spur gear

Post by Sandblaster » Sat Mar 17, 2018 11:41 pm

I have removed them and some are a lot easier then others to remove.
Once you get it out it's a cinch to press in the new gear.
I have never broke one or messed one up...
I believe I may have made some posts on that thread :shock:
If bikes are for kids I'll never grow up.

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Sandblaster
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Re: Water pump spur gear

Post by Sandblaster » Sat Mar 17, 2018 11:51 pm

The easiest way I found is to order a new one.
When it comes in, measure the shaft OD.
Order the correct size drill bit and drill it out.
When you put the new one in a light press fit is all you need as long as you use some retaining compound 8-)
If bikes are for kids I'll never grow up.

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Sandblaster
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Re: Water pump spur gear

Post by Sandblaster » Sat Mar 17, 2018 11:52 pm

And no... Only those that are belligerent, condescending, or spammers are unwelcome :lol:
This site is all about sharing knowledge..
If bikes are for kids I'll never grow up.

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60something
Posts: 57
Joined: Sat Mar 03, 2018 6:45 pm
Location: Midwest USA

Re: Water pump spur gear

Post by 60something » Sun Mar 18, 2018 2:48 am

Thank you!! :)
I don't know half of you half as well as I should like, and I like less than half of you half as well as you deserve.

2006 KDX200 qty-2
1987 KX500
1991 CB750 Nighthawk
1973 H2 750 Triple - gone but not forgotten

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