Performing case mods to big bore cylinders 

Eric, I have your second and third editions of the Motocross and Off-road Handbooks. I love the bike-spcific sections and I use that information on my two-stroke builds. Thank you SO much for sharing your knowledge with the world! You have inspired me to tackle several projects over the last 10 years or so. The two-stroke engine is an amazing concept. I just found this video and must say it's nice to put a face (and voice) to the name. Keep up the great work! Ryan

Dear Mr. Gorr, you are the most knowlegeable person in the galaxy when ir comes to our beloved smokers. Thank you for sharing your wisdom with us goofy folks...

thank you so much for making this video you saved me a lot of time and money

é sempre bom aprender um pouco mais com vocês, continuem sempre com mais vídeos mesmo que sejam de serviços corriqueiros se puderem. Parabéns

Love it. Thanks for the video

I did that to my rm80 because i brought an 85 cylinder by accident and it works perfect

Is this clearancing for the piston skirt or for proper oiling of the cylinder and wrist pin?

hello is this on rm 125 necessary with 56mm piston 125ccm or only 58mm piston and 144ccm?

Is this required when putting a 112 kit in a yz80?

Hi mr. Gorr I have a question regarding the removal of the excessive material for installing the big bore kit on the yamaha yz85. if you remove more than the allowable amount will it negatively affect the engine's performance? I look forward to a response from you

I found a video on this finally

Can i do the same on a 4 stroke air cooler big single for bigger sleeve bore?

is this necessary on a kawasaki kx 125 or is this just for Suzuki and yamaha

how much would it cost to get a big bore for rm 125

Gorr does all the big cr500s too

I could never trust a tape off job. It would drive me crazy. I would have to open up the cases to keep from losing my mind...

love how the most important piece of information is to find out what exact location needs grinding and this video doesnt show it very clearly. A before and after, side by side pic would have been nice. Or another view of it other than that camera angle thru the cylinder. Than the camera man is standing behind the guy grinding where you cant see anything rather than in front. SMH I appreciate the video tho. my 185 lb ass needs more power than a 125 going up hills.