YZ125 to 144

thereal87
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8/2/2016
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Sunshine Coast, AU
thereal87
Just had my cylinder bored and recoated, have modded powervalves to suit ect,
Just need to know what the head cc is going to need to be for the 144?

Cheers
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Paw Paw 271
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Benton, LA, USA
Paw Paw 271 6/13/2018 6:29am
6/13/2018 6:29am Edited Date/Time 6/13/2018 6:30am
I can't help you with the cc's, but I would be more concerned with making sure the squish size is correct.

Paw Paw
ChrissyDMX 6/13/2018 10:15am
6/13/2018 10:15am
I am most likely mistaken but I was thinking about doing a 144 to my yz125, is not as simple as buying a Athena kit? Like does that not include everything you need? Or do.you also have to do this too?
YZed250
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Costa Mesa, CA, USA
YZed250 6/13/2018 11:27am
6/13/2018 11:27am
thereal87 wrote:
Just had my cylinder bored and recoated, have modded powervalves to suit ect, Just need to know what the head cc is going to need to...
Just had my cylinder bored and recoated, have modded powervalves to suit ect,
Just need to know what the head cc is going to need to be for the 144?

Cheers
My kit came from Eric Gorr, already milled. He might know. He does respond to emails.
chump6784
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AU
chump6784 6/15/2018 5:35am
6/15/2018 5:35am
ChrissyDMX wrote:
I am most likely mistaken but I was thinking about doing a 144 to my yz125, is not as simple as buying a Athena kit? Like...
I am most likely mistaken but I was thinking about doing a 144 to my yz125, is not as simple as buying a Athena kit? Like does that not include everything you need? Or do.you also have to do this too?
You have to grind the cases for clearance

The Shop

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F1 Moto
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Buxton, AU
F1 Moto 6/17/2018 3:11am
6/17/2018 3:11am
You will have to bore the cases to accept the bigger piston.
12.5 cc would be a good starting point.
Even better with a VHM head & a few options on chamber inserts.

mxtech1
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Galesburg, IL, USA
mxtech1 6/21/2018 7:24pm
6/21/2018 7:24pm Edited Date/Time 6/21/2018 7:25pm
F1 Moto wrote:
You will have to bore the cases to accept the bigger piston. 12.5 cc would be a good starting point. Even better with a VHM head...
You will have to bore the cases to accept the bigger piston.
12.5 cc would be a good starting point.
Even better with a VHM head & a few options on chamber inserts.

Can’t you just ever offer some advice without plugging your products or hits to your website?

There’s several highly reputable engine builders and business owners that come here just to help out and bench race.

It gets old dude...
Mr. Robinson 6/21/2018 11:27pm
6/21/2018 11:27pm
thereal87 wrote:
Just had my cylinder bored and recoated, have modded powervalves to suit ect, Just need to know what the head cc is going to need to...
Just had my cylinder bored and recoated, have modded powervalves to suit ect,
Just need to know what the head cc is going to need to be for the 144?

Cheers
You'll need to increase the volume by 15% to maintain the stock ratio.

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