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  #1  
Old 08-17-2006, 09:32 AM
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Default Hole on intake side of piston. Is it needed? CR125

Hey guys,

My buddy has an 03 cr125 and ordered a new piston for it. However, when the piston came it we noticed that on the intake side it had no hole like the stock piston did have.

But, this is an OEM honda cr125 piston. SO my question is, do the newer than 03 or previous year 125 have pistons that dont have a hole on the intake side? Will it hurt the bike if he runs this piston? Also, this piston is domed on the top instead of being flat like the top of the stock piston.

Thanks, Dave.
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Old 08-17-2006, 09:41 AM
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Default Re: Hole on intake side of piston. Is it needed? CR125

Sounds to me like you may have the wrong piston and I would do some more research before assembly.

You say hole - you mean a window cut out or are you saying it's like a drilled hole?

Scott
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Old 08-17-2006, 09:47 AM
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Default Re: Hole on intake side of piston. Is it needed? CR125

Many tuners like to place the hole themselves, so the aftermarket companies send them without it. Some don't use them at all. We haven't on the big bore pistons we used with the CR125's.

The dome bothers me though. If yours has a head for the flattop, which the 03 did indeed have, you need the piston for it.
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Old 08-17-2006, 10:27 AM
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Default Re: Hole on intake side of piston. Is it needed? CR125

What I mean by hole, is a square (window) cut into the intake side of the piston. Like I said, both pistons are OEM honda cr125 pistons, but I guess the one we got this time isnt the 03 model year.

The dealer wouldnt have had the parts in for the weekend (even though they screwed up and ordered the wrong part, and it isnt the first time either mind you) so we decided to give it a try.

The bike runs fine right now with this piston in it, but I was just wondering what problems not having a hole might cause. As in, heat related burn downs, etc.
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Old 08-18-2006, 01:22 AM
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Default Re: Hole on intake side of piston. Is it needed? CR125

Let me type this slowly for you: The window/hole in the piston or lack of it will not cause your engine to overheat.

The dome is another case. It likely WILL overheat. Very good chance of preignition.

I hope the weekend ride ends up being worth it. At his point I would say get the highest octane fuel you can find and listen for the woodpeckers.
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Old 08-18-2006, 11:10 AM
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Default Re: Hole on intake side of piston. Is it needed? CR125

Quote:
Originally Posted by ossagp1 View Post
...and listen for the woodpeckers.
LOL!
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Old 08-18-2006, 02:56 PM
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Default Re: Hole on intake side of piston. Is it needed? CR125

Isnt the window on the intake side of the piston the only way the bottom end can get lubrication? I thought when the piston is at TDC, the gas can flow through the side of the piston and down into the bottom end for lubrication. Please correct me if im wrong.
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Old 08-19-2006, 02:32 AM
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Default Re: Hole on intake side of piston. Is it needed? CR125

The short form answer is that you are wrong.
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Old 01-29-2011, 01:10 PM
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Smile cr125

I am looking for a domed piston with intake window (davey boy)

---------- Post added at 01:10 PM ---------- Previous post was at 01:03 PM ----------

I'm going krazy looking for a domed piston with intake window (davey boy).whats the OEM part# please!
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