wrist pin needle bearing lubrication holes

Wow that is hard!! I'm never amazed what these engines will lead US to. Do you have a Dremel tool? If so, then I guess it's diamond bit time.

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I think your right on a diamind bit they can be had a harbor freight in a set for around $30.00. I paid that for a set of diamond burrs a bunch of different sizes and shapes. I wonder if the rod is case hardened? A gun smith can tell you how to annel a small area to drill it if its hardeded at least I heard that from someone. I'm not up on it. I think you have to heat it up to a red color and stick it in lime dust or something you might look it up on the web or ask your friendly gun smith.

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The diamond dremel bit did get a bit further into it, before the tip wore smooth. Two or so more might do the trick. $8+ is hard to swallow so I'll see what the local harbor freight has to offer tomorrow. That might be the answer: Chinese tools for Chinese parts!

I do have a go-to gunsmith, he might have some good bits...

Yikes !!! I told you they are hard steel !!! Wow !!! That is some of the hardest steel around.

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For drilling chromemoly or other tough (hardened) metals I always chucked up a hardwood dowel in the drillpress and ran it down on the spot to be drilled until it was smokin' good, then let it cool and drill.

Learned that from my Grandpa Elwood, 1901-1969.... real old school.

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I like the drill with the wooden dowel idea have no idea if it would work but it just likes like my own dad sitting in his old half lit garage concocting some idea that looks like crap but works like a dream.

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Thatsdax, do you sell your engines with needle bearings? I bought one about 2 years ago, would it have needle bearings. I also bought one about a month ago a 70 cc, the one I bought about a month ago is scarry fast. The one with out the ecorn nuts, or maybe my old one has too many miles on it and I forgot what a new one was like. 2 years with hard rideing. like every day full blast up hills and everything.

the new ones are roller uppers. the past year or so. To be honest, I like the solid bearing as well. That is, if they use a hard metal for the solid. I also like the roller, that is, if they have a good cage and the piston and connection rod are proper for the roller. So.. Roller or Solid? Depends. Both can be best. I will use either in my engines. What ever is better. To be honest, I prefer the Solid if it is a good hard metal and does not wear out too fast. But Roller is what most people want for the upper. Not sure why. But roller upper is what is being sold currently. And they are working out well for sure. But I must say, if a roller goes, it takes out the whole top end and sometimes the bottom as well. The Solid gives warning when it starts to wear out and will not trash the motor like a roller can. But.. As long as the roller is a good setup, they seem to last and not cause any problems. In over a year now, I have only had 5 or 6 rollers returned for warranty. I must say, that is amazing. So..For now.. It is roller. Enjoy the ride..

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What are warning signs of berrings going bad?

or bushing going bad?