Need help with engine knock - Ex-500.com - The home of the Kawasaki EX500 / Ninja 500R
 
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post #1 of 3 (permalink) Old 8-17-2019, 6:06 PM Thread Starter
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Need help with engine knock

Greetings to all. I have a low knock on the engine on the right, where the clutch basket is. Well heard at low 700-900 RPM. When riding a motorcycle at 4000-5000 RPM, I feel a strong vibration from engine. Now I completely disassembled the engine, in the service they say that my primary chain has a weak stretch, and if I change it my knocking problem will be solved. I measured the chain according to the manual, it is within normal limits, but if you hold it horizontally with pins up and down, then it sags 3-4 cm (1.575 in). Is this normal? Please tell me if anyone ever changed the primary chain and whether the engine could knock because of it. I canít upload videos and photos as I donít have 10 posts yet.

P.S. Sorry for my english
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post #2 of 3 (permalink) Old 8-18-2019, 10:13 AM
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The idle speed is not supposed to be so low. The specifications mark that it must be between 1250 and 1500 RPM.

If the idle is very low, the knock you hear is caused by compression of the engine fighting against the inertia of the flywheel that keeps the engine running.

As for the vibration, I have no way of giving you accurate information. Maybe if you give us more information about the model year and mileage of your motorcycle, some of the most experienced members can help you.

Greetings from Mexico!

Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -Albert Einstein.
2007 Ninja 500R
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post #3 of 3 (permalink) Old 8-18-2019, 6:44 PM Thread Starter
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Quote:
Originally Posted by jorge moros View Post
The idle speed is not supposed to be so low. The specifications mark that it must be between 1250 and 1500 RPM.

If the idle is very low, the knock you hear is caused by compression of the engine fighting against the inertia of the flywheel that keeps the engine running.
At 1200 rpm, there is also a knock. At 700 - 900 rpm it is more powerful. I listened same engine on Kawasaki ER-5 (1996 year, mileage 48000 km) at 700 rpm and its worked very smoothly.

Quote:
Originally Posted by jorge moros View Post
As for the vibration, I have no way of giving you accurate information. Maybe if you give us more information about the model year and mileage of your motorcycle, some of the most experienced members can help you.
My Kawasaki EX500D (GPZ500S) 1995, mileage 53000 km.
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