Front Sprocket will not budge

  • rackabo
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Front Sprocket will not budge

25 Aug 2013 23:10
#603074
I have a KZ750M (twin) that I am replacing the sprockets and chain on. The front sprocket seems to have been frozen on as I cannot get the nut to budge. I've hit it multiple times with a 400 ft lb pneumatic impact driver and still nothing. Is there a trick to taking these off or are they reverse threaded???

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  • 650ed
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Re: Front Sprocket will not budge

25 Aug 2013 23:22
#603076
They are not reverse threaded. It's possible the previous owner used permanent loctite on it. If so, you may need to heat it up first. Don't get too crazy with the heat because there is a seal back there behind it on the shaft and you don't want to melt it. Here's a good way to hold the counter-sprocket from turning when using the impact wrench. Ed


kzrider.com/forum/21-tools/325119-budget...rocket-holder#325119
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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  • Haybus
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Re: Front Sprocket will not budge

25 Aug 2013 23:55
#603078
+1 what Ed said. I had the same problem. Just a small propane torch - heat a little then try to move it, heat a little more, try again, repeat until it comes off.

Alan
1976 KZ900 LTD (sort of)
2005 FJR
2009 Hayabusa
www.kzrider.com/forum/11-projects/557845...-streetfighter-build
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  • rackabo
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Re: Front Sprocket will not budge

29 Aug 2013 10:05
#603691
Thanks for the suggestions! I did try to hit it with a small propane torch, but it still didn't try to come off. I ended up using some of the engineering education I am paying so much for to get it off. I went out and bought a 5ft black steel pipe from the plumbing sections at a hardware store and fit it on the end of my breaker bar. As torque is equal to force x distance, I was able to get enough torque to break it loose! Gotta love these old bikes!

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  • floivanus
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Re: Front Sprocket will not budge

29 Aug 2013 15:10
#603750
Might need a better impact gun, many out on the market advertise ratings that are nowhere near correct.

Many many times I've had to give assistance to some newer tech that bought an off-brand. Something like an ingersol rand 231-c or 2135 would be a sound investment and keep you from doing potentially dangerous improvised tool situations

Good luck with your project and be safe
my bikes; 80kz1000(project), 77 gl1000, 74 h2 (project)
Past; 78 kz1000, 83 kz550
Andrew

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  • turboking
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Re: Front Sprocket will not budge

29 Aug 2013 15:16
#603754
rackabo wrote: Thanks for the suggestions! I did try to hit it with a small propane torch, but it still didn't try to come off. I ended up using some of the engineering education I am paying so much for to get it off. I went out and bought a 5ft black steel pipe from the plumbing sections at a hardware store and fit it on the end of my breaker bar. As torque is equal to force x distance, I was able to get enough torque to break it loose! Gotta love these old bikes!


5 foot cheater bar :huh: :woohoo: :woohoo:
2005 Kawasaki mean streak
2000 325 H.P. mcXpress turbo Hayabusa
1979 kz 1000 mk II ATP turbo
1975 Z1 960 cc Mr. Turbo
1975 Z1 1428 big block ATP turbo
1976 Kz900 1103 cc ATP turbo
1985 GS 1150E
1983 GS 1100E
1997 Suzuki Bandit 1200S
2001 Kawasaki EX 500 Ninja
1972 Honda cb750 (836cc turbo)

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  • steell
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Re: Front Sprocket will not budge

29 Aug 2013 15:37
#603759
If you don't have compressed air available, a nitrogen tank will work.
Or, you could use a torque multiplier. I have one that is a small 1/2" drive 4X, multiplies the input torque by 4, 100 ft lbs in, 400 ft lbs out. The bigger 1" drive models would just wind the frame up into a ball.
KD9JUR

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  • CoolerKing
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Re: Front Sprocket will not budge

29 Aug 2013 16:00 - 29 Aug 2013 16:01
#603764
Glad to hear you got it off.

Mine wouldn't budge either. I tried to wrestle it with a breaker bar but no luck, a few burps with an impact and it was off. I'd like to think I loosened it up some :laugh:
1978 KZ650-C2
1976 KZ400D-3 (sold)
Last edit: 29 Aug 2013 16:01 by CoolerKing.

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