1986 RM 125 G

Probably snapped off when the cylinder was pryed off with the tire iron that left the gouges on the base of the cylinder.

If it were mine id find a used cylinder and have it replated. And be nice to the parts putting it back together

Not plated yet that year I think the very first year suzuki did that was 87 for the 250 and 89 for the 125. So your 86 takes a sleeve still but it maybe fucked up now anyways because someone used a screw driver to pry off the cylinder. Hope that didn't screw up the center cases too.

That's a sleeve, can see it clearly in photos. Call Eric Gorr. He'll know your best option,,if there's a sleeve out there he'll know,,and get it in right. Many cylinders are messed up by poorly installing a sleeve and not aligning the ports,,or not finishing them to match.

The 86 model was notorious for scorching top ends. Plug could look good, jetting right, and they still tended to cook themselves to death.

you could find a wiseco sleeve for the rm125 1986 on ebay item 232123648402
also you could call millennium technologies in Wisconsin phone: (920) 893-5595
they could provide you with a L.A sleeve most likely and do all the service for you
you will end with a new std bore cast iron sleeve again that is correct for the 1986 rm125 model

Millennium can fix it. Don't ever plan on going fast on a 86 RM125... Ain't evergoing to happen with one of the worst designed cylinder/powervalve's ever engineered for a MX bike from Japan. Zook scrapped the failed design after one year and it took them years to sell those 86's once the word got out how bad they we're!

I remember when they came out the local Suzuki shops son,,a very good b rider riding one for his Dad,,,told me the rotating linkage bearing,,a one year deal,,seized on them. I skipped getting one and instead got a year old 1985 KX125 cause it had hp.
Don't feel bad...I raced on a new 85 RM125 and it was slower than both my 78 RM125, and 83 KX125 that I raced before it. I did for some weird reason buy one a couple years ago at a yard sale to fix up...even though it was slow back in the day..was pretty bike and nice suspension..going slow.

I had an '86 RM 125, dumped about $400 into the motor and pipe, and I don't think it made a difference. Then I rode a friends stock '86 CR125 and that bike felt like a 250 by comparison.

I knew a few friends who raced the '85 RM's here in central Ohio, and their bikes were anything but slow. They were screamers, but they were fast, not KX125 fast, but if kept on the pipe would keep up with the KX's.