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Discussion Starter · #1 ·
How much noise at idle is too much?
Can someone post a sound clip on a well running bike at idle?
Bike is an 84 ZX900 A
Bike has 28k on it the last 14k where put on between 91 and 07.
 

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Discussion Starter · #4 ·
the just clicking

the chatter of the valve train, not engine noise the clicking part.
 

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Discussion Starter · #5 ·
thanks that helps a lot

Thanks that helps a lot. I have more clack than click.
 

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Lets RIDE!
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The worst it could be is piston slap...start with the small stuff. I don't know your bike so I can't tell you what the small stuff is, but find a owners manual and start checking. If it's piston slap, then get it fixed fast before you wreck the engine more.

The only "clack" noise I've ever heard from an engine is when I blew a piston rod in my bro's truck after I went off roading and water got into the engine...:oops:
Good it was still under warranty.
 

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Discussion Starter · #7 ·
thanks

I have a manual.
The noise is only at idle.
At first I thought it was chain slap but the noise is coming from the valve train area on top then from the side where the chains are.

I will check the valve clearance, timing, change the spark plugs and do a carb sync.

If the noise goes away, I will then look at the throttle issue.

I also need to look at how I am riding the bike.
My previous bikes redlined at 7 to 8k, 4 to 6k was in the powerband.
So when I was riding it this weekend I didn't rev past 5k.
So I need to find an open parking lot to test ride it and learn the right gears and rpm.
 

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Discussion Starter · #9 ·
It's the battery stupid

So I found out the battery was not fully charged, once the battery was charge the nature of the bike changed.

It starts immediately upon pushing the start button with no choke. Temp is 47 degrees. Bike tach shows 2k upon starting and settles down to 1k within 20 to 30 seconds after starting.
The bike Tach works right away instead of 2 minutes after the bike starts.
The idle is good now, and the valve train noise has gone away.

I am still going to go through the bike and check the valves, change the spark plugs a long with checking the timing and carb sync. and check the charging system.

Will keep all up to date on progress and thanks for all of the advice.
 

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Discussion Starter · #11 ·
Valves are adjusted

Valves are adjusted, carbs are sync.
All noises have gone away.
Now just need to get the carbs done.
It appears the carbs have a stage I kit with air pods.
Idle is fine, acceleration is fine
Bike still bogs down between 1/4 and 1/2 throttle.
 

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Discussion Starter · #12 ·
going to re do jets

This is what I found,
the carb had a 120 main,
the e clip was on the first slot
the pilot screws where turned all the way in.

So I went and installed 136 main jets
set the e-clip on the second notch and turned the pilot screws 4 turns out.

I will work from there.

remember bike has pods and supertrapp exhaust.
 

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Discussion Starter · #13 ·
Wow!!!

Wow what a difference!
So after setting bike up by dynojet instructions, the thing is a beast.

Pulls well through all gears.
No bogging down when throttle is snapped open.

It can maybe idle just a tad bit better but that is for another day,
Now it is time to ride.
Thanks all for the help.
 
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