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Author Topic: Can oil viscosity affect on engine performance?  (Read 731 times)

Yoni159

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Can oil viscosity affect on engine performance?
« on: June 13, 2020, 01:33:24 PM »
I put 5w50 in my scooter instead 5w40 because i saw in the owner manual that 5w50 is the perfect viscosity... But my scooter runs really bad he loose so much power and the rpms go high than usual it could be because that? Or its something in the variator?
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john grinsel

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Re: Can oil viscosity affect on engine performance?
« Reply #1 on: June 13, 2020, 01:48:21 PM »
My opinion---if is not the oil
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Stig / Major Tom

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Re: Can oil viscosity affect on engine performance?
« Reply #2 on: June 13, 2020, 02:21:48 PM »
Certainly has nothing to do with the oil.
When was the last time the belt and roller weights were replaced with Kymcp parts?

Stig
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Boston Strong
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Yoni159

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Re: Can oil viscosity affect on engine performance?
« Reply #3 on: June 13, 2020, 02:39:51 PM »
Immediately after i changed the oil i go to the mechanic to do variator service he change the belt and the rollers but after that the scooter start to run really bad he loose Power and rpms are hifh than usual that it can be? I go to him tomorrow but i want to know
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Yoni159

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Re: Can oil viscosity affect on engine performance?
« Reply #4 on: June 13, 2020, 02:48:12 PM »
And the fuel efficiency get worse
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Stig / Major Tom

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Re: Can oil viscosity affect on engine performance?
« Reply #5 on: June 13, 2020, 03:23:40 PM »
Should be an interesting conversation between the two of you.
Did he use Kymco belt and stock roller weights?

Stig
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Boston Strong
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CROSSBOLT

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Re: Can oil viscosity affect on engine performance?
« Reply #6 on: June 13, 2020, 03:29:26 PM »
Your mechanic probably did NOT get the belt jammed as far into the rear pulley as possible BEFORE he tightened the nut on the front pulley. Common mistake made by all beginners! It ran good before mechanic, ran bad after mechanic, problem CAUSED by mechanic. Verry carefully and gently ride your machine to mechanic. Better yet, take it back in a trailer.
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Karl

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Yager 200i
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Yoni159

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Re: Can oil viscosity affect on engine performance?
« Reply #7 on: June 13, 2020, 04:27:08 PM »
Quote from: Stig / Major Tom on June 13, 2020, 03:23:40 PM
Should be an interesting conversation between the two of you.
Did he use Kymco belt and stock roller weights?

Stig
yes the belt was original kymco belt the rollers i think so.. he put new yellow rollers they looks like kymco
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Yoni159

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Re: Can oil viscosity affect on engine performance?
« Reply #8 on: June 13, 2020, 06:19:22 PM »
Can the oil viscosity cause to worse fuel efficiency when i used 5w40 i am did 24-25 km per liter on normal ride now with 5w50 i am doing 22-21km per liter
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CROSSBOLT

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Re: Can oil viscosity affect on engine performance?
« Reply #9 on: June 13, 2020, 06:34:05 PM »
Yes. Thicker oil will cause a very slight decrease in mileage. The bigger effect in milage in the US is the difference between summer and winter gasoline. Winter gives poorer fuel economy.
Your situation may be affected by an improper CVT assembly. Or a worn belt will cause a drop in km/liter.
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Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

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