An odd Rattle...

  • Robwolf
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Re: An odd Rattle...

22 Nov 2011 21:08
#489752
Video, poor mic on the phone can't hold up to that much noise.
'79 Kz400H1 'cafe' and '94 En500 Vulcan in swampy Florida.

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  • Motor Head
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Re: An odd Rattle...

22 Nov 2011 21:24
#489755
Was the Idle that high before you did the Points replacement?
Hard to tell on the noise, EX is Loud, and the Mic is getting that instead.
It sounds like it is really struggling with the starter, hows the Kicker? Hard to Kick it? Stiff?
Is so Turn the ignition off and kick it, any better?
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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Re: An odd Rattle...

22 Nov 2011 22:40
#489769
That's the idle while choked. Normally around high 3k. When warmed up 1500 to 2k is the norm. Anything less than 1500 and it stalls.
'79 Kz400H1 'cafe' and '94 En500 Vulcan in swampy Florida.

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Re: An odd Rattle...

23 Nov 2011 04:10
#489804
Robwolf wrote: "You should get into the habit of using a torque wrench when working on your bike"

I probably should. I need to make the investment in some good tools.

This investment is very valuable for future investment.
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Re: An odd Rattle...

23 Nov 2011 07:29
#489814
Would check the timing advancer and assure that it's functioning properly.

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Re: An odd Rattle...

23 Nov 2011 19:01
#489876
Remember though, the trouble only begins after the bike reaches higher temperatures. I'd say after about 10-15minutes of riding, less if accelerating hard or riding at highway speeds. Could the oil be gunked up, or maybe not getting to all the parts in the engine, causing the poor thing to overheat?
'79 Kz400H1 'cafe' and '94 En500 Vulcan in swampy Florida.

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Re: An odd Rattle...

23 Nov 2011 19:48
#489886
Have you checked the valve clearances? Thats easy to do on the twins.
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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Re: An odd Rattle...

24 Nov 2011 01:47
#489935
Motor Head wrote: Have you checked the valve clearances? Thats easy to do on the twins.

Right, adjust the valves before you do anything else.
KD9JUR

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Re: An odd Rattle...

25 Nov 2011 20:23
#490131
Adjusted valves to be ~.2mm. Adjusted point gap to where it belongs, advanced timing slightly. Checked timing chain tension and adjusted it. Changed the oil. Fired up, ran loud and normal for a few seconds, and then that evil rattle returned. Its pretty fast paced, matches the RPMs and sounds something like metal on metal clinking. It got louder earlier today. I'm beginning to thing that something is broken or loose inside the engine. Tomorrow I will pull the side cover off where the magneto is and take a look in there. The sound is coming from the left side, but I can't tell if its down near the bottom or up near the top. I seem to have exhausted most of the options involving the upper end and timing and may now need to look lower. *SIGH*
'79 Kz400H1 'cafe' and '94 En500 Vulcan in swampy Florida.

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Re: An odd Rattle...

25 Nov 2011 21:18
#490136
Robwolf wrote: Adjusted valves to be ~.2mm. Adjusted point gap to where it belongs, advanced timing slightly. Checked timing chain tension and adjusted it. Changed the oil. Fired up, ran loud and normal for a few seconds, and then that evil rattle returned. Its pretty fast paced, matches the RPMs and sounds something like metal on metal clinking. It got louder earlier today. I'm beginning to thing that something is broken or loose inside the engine. Tomorrow I will pull the side cover off where the magneto is and take a look in there. The sound is coming from the left side, but I can't tell if its down near the bottom or up near the top. I seem to have exhausted most of the options involving the upper end and timing and may now need to look lower. *SIGH*

Might find a loosened bolt in the generator area.

Here's another source for info and trouble-shooting.

www.armbell.com/forum/index.php?c=6&sid=...571a51a&mforum=kz400

www.kz400.com/

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1973 Z1
KZ900 LTD

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Re: An odd Rattle...

25 Nov 2011 21:19
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Robwolf wrote: ........... The sound is coming from the left side, but I can't tell if its down near the bottom or up near the top. I........

Try using the crude but effective mechanics stethescope - a long screwdriver with a good solid plastic handle. Put the blade of the screwdriver against the suspect part of the motor and hold the handle right against your ear. That should help find where exactly the noise is coming from
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Re: An odd Rattle...

25 Nov 2011 21:26
#490138
I've been using KZ400 a lot. Hell used it before I even picked up the bike. THe other one I haven't seen yet, have to check it out.
'79 Kz400H1 'cafe' and '94 En500 Vulcan in swampy Florida.

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