Wristpin Bearing Upgrade?

What can anyone add?
Anyone done one? thatsdax? Norman?
Tools needed?

I have bushed engine and am contemplating the upgrade.

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If it ain't broke, and you mess with it long enough, it will be.

I will be attempting one soon I plan on making my bushing on the lathe. I want to take the engine completely apart just for the **** of it.

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norms-iron-works.tripod.com
motor assisted bicycle engine headlights that work off of your white power wire. check it out

Refresh my memory... does the bushing press out of the rod, or what? How about the bearing going in? Do I do the old heat-the rod-freeze-the-bearing deal?

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If it ain't broke, and you mess with it long enough, it will be.

What my plans are. Press out the bushing from the rod 12 ton press ought to do the trick. I'll make a tool to push out the bushing. Make the bushing out of aluminum or bronze bushing material. freeze the bushing heat up the rod and hope It will almost drop in I will check with my uncle on the correct interference fit or what he recommends for fit and type of material to use or one of the local speed shops and see what they recommend. I've been eyeballing an arbor press at harbor freight its about $40.00 but goes on sale now and then. I'll ream the bushing to size after i get it in place. I might have to make a fixture to do that to get it straight etc.
Darn it I'm talking myself into going out in the shop tonight and start on it.
I've always sent the rods out to a machine shop for these kind of repairs so this will be my first. I hope I don't mess it up.
Norman

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norms-iron-works.tripod.com
motor assisted bicycle engine headlights that work off of your white power wire. check it out

Well heck, I'm going to tear into this bushed job and see what there is to see....I'll be reprting back in a couple of days.

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If it ain't broke, and you mess with it long enough, it will be.

You guys are a lot more ambitious than me. I play **** just changing a bearing in a wheel. Good luck to both of you.

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the standard bushing type bearing is a different size than the roller. You can not replace the Bushing with a roller. They are a different sizes. Besides,, A bushing can be more reliable than a roller if the proper material is used. You can replace the roller bearing with a solid. But not the other way around. If it were me, and I had problems with too soft a solid bearing, I would consider looking for a harder material and replace the solid with a harder material...Now that all said........... It seems to me that I remember a guy that was selling replacement rollers for those that had bushing. Not sure where he got them. Not sure the guy is still around. It may be that he was able to spec some rollers that fit. Not sure.. o well.. Thats the latest as I know it. Enjoy the ride...

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visit www.thatsdax.com for more !!

My motor had a bushing when I first bought it. We ended up reaming the rod out (w/ a reamer) and used a Zenoah G43 wrist pin bearing. The quality of these bearings seem to be made better than the stock ones. I knew my bushing was starting to give out when the motor started to vibrating more at high RPMs. Plus I started to lose torque when climbing hills

thatsdax, don't you sell a roller bearing for upgrade on your site? I may be mistaken, but that's why I was gonna tear this baby down. I thought I saw a bearing and I was gonna change the bushing for the bearing...

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If it ain't broke, and you mess with it long enough, it will be.

My bad....I see it DOES NOT say "upgrade", it is a replacement part.

Well, that will save me a little work.

That'sdax, do you have replacement bushings?

I DO NOT suspect it is going bad....BTW how long does this bushing last? What's the highest mileage engine you know of?

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If it ain't broke, and you mess with it long enough, it will be.