CR125R Big Bore

hondaracer6
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hondaracer6
Edited Date/Time 1/27/2012 9:41am
Hey guys, i just have a few questions on a 134 big bore kit for my 03 CR125R. So first, i already know that its a 56mm piston kit and that i obviously need it bored to that, but what else do i need as in parts, and what else, like as in mods, or resleeving or something, do i have to do? And also any suggestions for places to go for all this (best price, best work, ect) thanks!
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MX Dad #27 10/6/2011 7:15pm
10/6/2011 7:15pm
Eric Gorr's Forward motion. Built all our Super-Mini bikes and our CR 144. Super work, great prices.
mxtech1
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mxtech1 10/7/2011 5:10am
10/7/2011 5:10am
You shouldn't need anything special done to the cases for only a 134cc. The cases should not need bored out. The cylinder will need bored and coated in nikasil and the powervalves will need to be cut to match the bore. You don't need to sleeve it. the head will need to have the squish band altered to maximize your performance.
chase383
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chase383 10/11/2011 1:06pm
10/11/2011 1:06pm
Eric Gorr... great stuff.. I have an 05 YZ144 and and 08 YZ285 both are awesome. great guy, great work.
lumpy790
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lumpy790 10/14/2011 6:25am
10/14/2011 6:25am
Need the piston & rings?

The Shop

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Erick
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Erick 10/14/2011 9:39am
10/14/2011 9:39am Edited Date/Time 10/14/2011 9:41am
You can brush the cases with Scotch Brite together with WD40. After you finish with the cases, use a very small wire brush attached to a small drilling machine and do it all over again. This way you will get a very shiny finish. If you want to take it to the next level, use a good aluminium polish and a rag after you finish with the wire brush.

Another option is blasting the cases with salt. You can blast the engine assembled and clean it with water afterwards. You can get the OEM as cast finish this way.

Dogger315 on this forum knows a thing or two about this procedure Wink
lumpy790
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lumpy790 10/14/2011 11:10am
10/14/2011 11:10am
Erick wrote:
You can brush the cases with Scotch Brite together with WD40. After you finish with the cases, use a very small wire brush attached to a...
You can brush the cases with Scotch Brite together with WD40. After you finish with the cases, use a very small wire brush attached to a small drilling machine and do it all over again. This way you will get a very shiny finish. If you want to take it to the next level, use a good aluminium polish and a rag after you finish with the wire brush.

Another option is blasting the cases with salt. You can blast the engine assembled and clean it with water afterwards. You can get the OEM as cast finish this way.

Dogger315 on this forum knows a thing or two about this procedure Wink
UMMMMMM......wrong post
Erick
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Erick 10/14/2011 3:12pm
10/14/2011 3:12pm
Woops, wrong thread

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