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 Post subject: Fresh buit motor has a knock sound
PostPosted: Fri Dec 23, 2016 3:24 am 
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Location: Blountstown,FL
150cc fresh built from ground up with +2 stroker sounds almost like its knocking..... What could cause it? Could it be piston slap? Only thing not new is the case halves. Runs like a top. Kinda stumped.


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 Post subject: Re: Fresh buit motor has a knock sound
PostPosted: Fri Dec 23, 2016 5:48 am 
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Is there any difference in the knocking when it is cold or warmed up?. Does the knocking follow the rpm (more when faster)? Grab a small metal pipe and listen through it as you touch it to various parts of the engine. Should act as a doctor's stethoscope and hopefully you can tell what part of the engine the knocking is coming from.

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 Post subject: Re: Fresh buit motor has a knock sound
PostPosted: Fri Dec 23, 2016 6:59 am 
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Location: Elburn Il.
Did you use a spacer with the stroker? Maybe you need higher octane fuel now

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 Post subject: Re: Fresh buit motor has a knock sound
PostPosted: Fri Dec 23, 2016 3:42 pm 
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Location: Blountstown,FL
The knock sound stays the same cold/hot and at idle/wot and yes i used the spacer. I started with 83 and now has 93 octane and it didnt change. The piston that came with the cylinder(58.5) had to much material below the wrist pin so i ordered a hoca piston which cleared the couter weights. So maybe the hoca piston is just slightly smaller than the bore?


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 Post subject: Re: Fresh buit motor has a knock sound
PostPosted: Fri Dec 23, 2016 4:13 pm 
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Location: Elburn Il.
Does it idle fine?

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Blade DX 150*
* on the juice for sale
HH 250ss
Quiksilver sr 440(went to a good home)
Joyner 650 SS
Red and black Redline Riots


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 Post subject: Re: Fresh buit motor has a knock sound
PostPosted: Fri Dec 23, 2016 8:57 pm 
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Location: Blountstown,FL
Idles fine and runs like a raped ape. Has an initial sputter when you first get on it but the carb is just one i had laying around.


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 Post subject: Re: Fresh buit motor has a knock sound
PostPosted: Sat Dec 24, 2016 2:57 am 
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Location: Elburn Il.
take the vari off and see if its just the motor

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Karl



Blade DX 150*
* on the juice for sale
HH 250ss
Quiksilver sr 440(went to a good home)
Joyner 650 SS
Red and black Redline Riots


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 Post subject: Re: Fresh buit motor has a knock sound
PostPosted: Sat Dec 24, 2016 9:54 am 
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check the starter clutch nut, it may have came loose

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