Check your piston return springs - Ex-500.com - The home of the Kawasaki EX500 / Ninja 500R
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post #1 of 9 (permalink) Old 9-6-2019, 11:19 PM Thread Starter
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Wink Check your piston return springs

Who knew, not only is it important to change the blinker fluid, preferably with synthetic but also check the piston return springs.

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post #2 of 9 (permalink) Old 9-6-2019, 11:50 PM
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The misinformation in this video makes me cringe. Everybody KNOWS you also need replace the power band when you replace the piston return springs.
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post #3 of 9 (permalink) Old 9-7-2019, 12:06 PM
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Originally Posted by K-woppa View Post
The misinformation in this video makes me cringe. Everybody KNOWS you also need replace the power band when you replace the piston return springs.
Not necessarily. When you're working on an old beater like the one in the video, sometimes it makes sense to just reuse the old powerband to keep the cost of the job down if you know the car's only got a year or two left before it winds up in the junkyard.

On the other hand, if the vehicle was in good enough shape to last many years and thousands of miles, it did make sense to replace the powerband. For our more competitive customers we offered them the option of substituting a high tensile steel powerband in place of the standard rubber one. That way the engine would rev much higher and produce lots more power. Of course, when going with a steel powerband, piston return springs with a higher spring rate had to be installed as well.

Its all about what's appropriate for each job and customer. The nice thing about steel powerbands and high rate piston return springs is that unlike other high performance mods, they are inside the motor and totally undetectable when the car is taken in for emissions testing.
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post #4 of 9 (permalink) Old 9-9-2019, 9:00 AM
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Not necessarily. When you're working on an old beater like the one in the video, sometimes it makes sense to just reuse the old powerband to keep the cost of the job down if you know the car's only got a year or two left before it winds up in the junkyard.

On the other hand, if the vehicle was in good enough shape to last many years and thousands of miles, it did make sense to replace the powerband. For our more competitive customers we offered them the option of substituting a high tensile steel powerband in place of the standard rubber one. That way the engine would rev much higher and produce lots more power. Of course, when going with a steel powerband, piston return springs with a higher spring rate had to be installed as well.

Its all about what's appropriate for each job and customer. The nice thing about steel powerbands and high rate piston return springs is that unlike other high performance mods, they are inside the motor and totally undetectable when the car is taken in for emissions testing.

Performance mods that are totally undetectable to anyone, including the driver.
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post #5 of 9 (permalink) Old 9-9-2019, 9:50 AM
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How does this all apply to a Desmodrama which doesn't use springs?

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post #6 of 9 (permalink) Old 9-9-2019, 12:35 PM
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How does this all apply to a Desmodrama which doesn't use springs?
I can't believe that you, of all people ducatiman, are asking that question. I thought everybody knew that the desmos use a totally different system that doesn't use piston return springs to go along with the valve return springs they also don't have. Due to the unreliable supply of high quality spring steel in Italy, Ducati engineers were forced to design a mechanical piston return system called connecting rods.

Regardless, all Ducati engines come equipped from the factory with an impressive powerband, which is quite definitely detectable by the driver. I agree though, an old clapped out Honda Civic, not so much.
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post #7 of 9 (permalink) Old 9-9-2019, 6:03 PM
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Originally Posted by [email protected] View Post
I can't believe that you, of all people ducatiman, are asking that question. I thought everybody knew that the desmos use a totally different system that doesn't use piston return springs to go along with the valve return springs they also don't have. Due to the unreliable supply of high quality spring steel in Italy, Ducati engineers were forced to design a mechanical piston return system called connecting rods.

Regardless, all Ducati engines come equipped from the factory with an impressive powerband, which is quite definitely detectable by the driver. I agree though, an old clapped out Honda Civic, not so much.
I never knew Ducati used a desmodromic piston setup. You learn something every day.
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post #8 of 9 (permalink) Old 9-9-2019, 6:08 PM
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I didn't know either, until I read it on the internet.
post #9 of 9 (permalink) Old 9-9-2019, 10:07 PM
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Originally Posted by K-woppa View Post
I never knew Ducati used a desmodromic piston setup. You learn something every day.
But I really don't like the Desmodramatic piston setup .....really noisy like that dry cluntch thingy it has...

Is there a spring conversion kit?

How 'bout the cluntch....can I add oil to it? Or eliminate it entirely? Yes....a direct drive mod! I'll have to look into that.

Hey, maybe I made a mistake in buying the Dungcati? Sure wish I had them piston springs.

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