Sachs – Wrist Pin Bearing Failure

[sixdazed]

Hey Guys,I just lunched the motor on my 125 last weekend and come to find out the wrist pin bearing was the culprit.What's the latest on which top bearing to use and who has them?Dark Brown is the cage color to use???I know i have some new ones just want to make sure this doesn't happen again-it figures,i finally after 40 years get my Dad to come see me race and i make 2 laps of practice:(.Thanks,
                                                                Ric

ric emmal

[Knute]

Hey Ric,

I believe the bearings Al sells now are Wiseco, which are very good.  You might give him a call and see what the latest news is.

TEAM PENTOVARNA
Kent Knudson
Kevin Brown
Gary & Toni Roach
James & Adam Giddings
Dennis & Cory Buttrick

[sixdazed]

Thanks Kent,I'll give him a ring.
                                   Ric

ric emmal

[sixdazed]

Just ran across another wrist pin bearing grey in color-new part but the rollers were falling out of the cage(each roller has a separate slot so i know the're not supposed to) and the thing just looked kind of cheesy.Don't know where it came from but not using it.Just a warning to look at all your parts before installing-it could save you a lot of grief! Later,
                                    Ric

ric emmal

[OUCWBOY]

I think some folks were using the wrist pin bearing that came with the re-made rod kits. DO NOT USE those wrist pin bearings. Those re-made rod kits are from China and even though the rods seem to be OK, the bearing are not. Just my thoughts. If you have a re-made rod kit, open it and look at the wrist pin bearing, they are a lighter shade of grey and looks to have NOT been heat treated and as we all know, the quality of the metal used in china is NOT near what it needs to be.

Donny Smith
Paragould, AR

[brian kirby]

Part of the problems Ernie and I identified with his failed wrist pin bearings (donno if they were Wiseco or Chinese) was two fold. One is the bearing roller itself was shorter side to side, so as the bearing moved it would put excessive load on the "shoulder" of the roller, and probably causing the cage to fail. Also, the rollers themselves were larger in diameter, and fewer of them in the cage, where the originals were much smaller in diameter and quite a few more per bearing (2-3) which disperses the load more evenly between rollers.

When I did the top end on my 100 I did not use a new bearing because I could not find one with rollers the width and diameter of the original, only the ones like Ernie had fail. I have since found that a '2011 KTM125 has the same size bearing as the Sachs 100/125 and KTM 125/175 in Pentons. I would bet that is a darn good bearing, but I have not ordered one to inspect it yet.

Brian

[sixdazed]

Just ran across another wrist pin bearing grey in color-new part but the rollers were falling out of the cage(each roller has a separate slot so i know the're not supposed to) and the thing just looked kind of cheesy.Don't know where it came from but not using it.Just a warning to look at all your parts before installing-it could save you a lot of grief! Later,
                                    Ric

ric emmal

[OUCWBOY]

I think some folks were using the wrist pin bearing that came with the re-made rod kits. DO NOT USE those wrist pin bearings. Those re-made rod kits are from China and even though the rods seem to be OK, the bearing are not. Just my thoughts. If you have a re-made rod kit, open it and look at the wrist pin bearing, they are a lighter shade of grey and looks to have NOT been heat treated and as we all know, the quality of the metal used in china is NOT near what it needs to be.

Donny Smith
Paragould, AR

[brian kirby]

Part of the problems Ernie and I identified with his failed wrist pin bearings (donno if they were Wiseco or Chinese) was two fold. One is the bearing roller itself was shorter side to side, so as the bearing moved it would put excessive load on the "shoulder" of the roller, and probably causing the cage to fail. Also, the rollers themselves were larger in diameter, and fewer of them in the cage, where the originals were much smaller in diameter and quite a few more per bearing (2-3) which disperses the load more evenly between rollers.

When I did the top end on my 100 I did not use a new bearing because I could not find one with rollers the width and diameter of the original, only the ones like Ernie had fail. I have since found that a '2011 KTM125 has the same size bearing as the Sachs 100/125 and KTM 125/175 in Pentons. I would bet that is a darn good bearing, but I have not ordered one to inspect it yet.

Brian

[sixdazed]

Thanks Donny/Brian/All-Sounds like the solution was sitting in my dining room all along(my 2010 KTM150xc-it sleeps in the house).I'll go down and pickup a bearing for it-between that and the one Donny is sending i ought to have it covered.Thanks,
                                             Ric

ric emmal

[TeamSunset]

I have (18) OEM Sachs #0632-111-001 Upper Rod Bearings available. Get em' while you can... I have had no luck locating any quantities of the 0632-111-001 OEM Bearings in the past year. Thank you, Tom G. [email protected]

[LINDEMAN]

I have been using Suzuki RM-125 wrist pin bearings for years in sachs motors with no problems.I can find the part # if needed.I think they are from early 90s model.