LA Sleeve Yamaha Yz250 1999 - 2020 Power Valve And Stud Removal

[@franciscoescobar7647]

how much to do sleeve on yz250 cylinder stock bore?

[@LASLEEVE]

Thanks for the inquiry! Sleeving a YZ250 costs $315.

[@franciscoescobar7647]

@@LASLEEVE my cylinder has a little part worn. or you guys can make it bigger for me to put a oversize piston? how much?

[@LASLEEVE]

We should be able to fix almost any wear no problem. You can do the 270 big bore (+2mm bigger) that runs about $650 for all parts and labor (piston, BB gasket kit, bearing) and also includes the head mod and power valve mod that need to be done to clear the piston. If you want to go all out you can do the 300 big bore and that goes to 72mm (+5.5mm), that costs $1100. That kit comes with custom porting to the cylinder as well. It gets a pretty big useable power gain.

[@davidwelch5566]

What do u recommend doing if you DO round off one of the allen bolts thay hold down the powervalve shaft? I have a cylinder with thay exact problem.

[@LASLEEVE]

Hey David. Once those bolts are stripped there isn’t a clean way to remove them. The best way I found is to grab a Torx Bit Socket (start with a T25) and get a Hand held Impact Driver. Put the T25 on the impact driver and hammer it into the rounded Allen bolt. If you can’t get it go to a T30. If you still can’t get it you may need to drill it out. Hope this helps!

[@LASLEEVE]

Here is an idea of low cost tools I use for this.. Impact driver www.amazon.com/dp/B000NPPATS/ref=cm_sw_r_sms_awdb_imm_F60Y0Z6V1G2KH4M6Z81J Torx Bit www.amazon.com/dp/B07R8J83BZ/ref=cm_sw_r_cp_awdb_imm_WJ190FRNV5NX8BM9H46G

[@davidwelch5566]

Ok thank you for the advice and for getting back to me so quickly

[@LASLEEVE]

Just got one in today with that problem. Instead of hammering on it I decided to just drill the bolt out. Wasn’t to difficult. Used a 5/32 bit and as soon as it got thru the top portion of the bolt the head popped off and I was able to get the shaft off. Then used a 3/32 bit to remove the leftover piece in the shaft. Good luck.

[@davidwelch5566]

@@LASLEEVE I got all my now thanks to the advice that you gave me bro! Sending the cylinder off to millennium in Wisconsin today as we speak!!!

[@mrblack3480]

That’s flat bit on the valve slider is in pieces, I just jab weld it