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mxFOLGA Started a new thread YZ 125 custom engine mods
3/22/2021 11:23am Hello Everyone, I have 2012 YZ125 with maybe 70-100 hours on the chassis. I want to build a bike for a GNCC race- more bottom end response 
Bottom and top end freshly rebuilt. Engine cases are filled with epoxy and putty. Reeds cage inlet is filled with putty to reduce crankcase voulume. I plugged the oil holes of the...
Bottom and top end freshly rebuilt. Engine cases are filled with epoxy and putty. Reeds cage inlet is filled with putty to reduce crankcase voulume. I plugged the oil holes of the...
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mxFOLGA Added a reply to YZ 125 custom engine mods
3/21/2021 7:45am I think you can seized crankshaft bearings or connection rod bearing. I think...
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mxFOLGA Added a reply to YZ 125 custom engine mods
3/21/2021 7:43am Hello everyone! Thank you for being interested in my project. Unfortunately, things are not going as planned… I have installed 36mm Keihin Carb. First kick and bike sounds like Factory 125 KTM which I saw at World Enduro Championships a few years ago. Super crisp!!! I spent some time to perfectly jest the carb. Bike was awesome. 5th gear and...
mxFOLGA Started a new thread Taddy 111 Blazusiak Jersey
12/5/2020 12:43pm Hello, I am raising money for my rehab process after a dirtbike crash. There is an auction on Facebook Group where you can by Taddy's Jersey with his signature. You can comment your bid until 9th of December 1 PM Mountain Time 1 USD is about 3.8 PLN Link: https://www.facebook.com/photo?fbid=3891224247563314&set=gm.81960008215… For more info visit: https://www.gofundme.com/f/support-jasiek039s-road-to-recovery
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Mr. Robinson Liked a reply to forum topic YZ 125 custom engine mods
4/11/2020 7:13pm
Cut your cylinder base .5mm. That will lower the port timing and pull the power peak down a little lower in the rpm range. It will also tighten up the squish to 1mm. You can open the chamber in the head to put back some volume lost with the tighter squish, but increasing the compression will boost the low end. You did a lot of grinding in the boost port, you did raise the port or increase the angle? That may be your lose of bottom end. As mentioned the Keihin normally makes a little better low end power than...
This forum topic has 24 replies.
mxFOLGA Added a reply to YZ 125 custom engine mods
4/11/2020 9:40pm You are right, I have grind the boost port. I have made it as Eric Gorr's cylinder. Maybe it is touch too much (If future changes will not help it- Epoxy will do so) I didn't do any changes to the heights or angles. This makes sens that I haven't gain bottom end... With the needle do you think I...
mxFOLGA Added a reply to YZ 125 custom engine mods
3/31/2020 10:08pm SXS, no I haven't put it on the dyno yet. But when I feel the bike is good for sure I will do it! chumpt6784, Cylinder is not ported, I only cleaned it from the cast unperfections and match transfer ports with the crankcase. Didn't remove any material. Yes, different pipe for sure will be a way to go! But...
mxFOLGA Added a reply to Matching Cases?
1/22/2019 12:30pm How Can I find Mr. Marsh website>?