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Not sure if this could be stick'ied.
This post is just collating all the bearing information into one post, from bearing size, to where you can buy them from, to disassembling your engine and finally tot fitting the bearing.
OS50 SX-H
Rear Bearing - 6902 15x28x7mm OPEN BEARING
Front Bearing - R6Z 9.525x22.22x7.14mm SHIELDED (on one side)
OS55 HZ
Rear Bearing - 6902 15x28x7mm OPEN BEARING
Front Bearing - R6Z 9.525x22.22x7.14mm SHIELDED (on one side)
OS91
Rear Bearing - S16003 17x35x8mm OPEN BEARING
Front Bearing - R6Z 9.525x22.22x7.14mm SHIELDED (on one side)
YS56
Rear Bearing - 6902 15x28x7mm OPEN BEARING
Front Bearing - R6Z 9.525x22.22x7.14mm SHIELDED (on one side)
YS 91
Rear Bearing - S16003 17x35x8mm OPEN BEARING
Front Bearing - R6Z 9.525x22.22x7.14mm SHIELDED (on one side)
All the above 50 size engines use the same front and rear bearings, same for the 90 size.
50 size rear bearings
BearingsUK
RCBearings
eBay
50 size front bearings
Simply Bearings
90 size rear bearings
Simply Bearings
eBay
eBay -
90 size front bearings
Simply Bearings
Disassembly guide by Ash Davis can be found here, and well worth a watch.
This is how I change my bearings and has been the easiest/quickest method so far, as ever; there are many different ways to skin a cat.
Once you just have the crank case in your hand you can start to replace the rear bearing;
1) Wait for the Crankshaft to cool down and place in a sandwich bag and leave in the freezer for half hour ('ish).
2) Heat up the over to around 200c
3) Leave the cranks case in the oven for aroun 10 minutes, with an oven glove remove the crank case and gently tap out the bearing.
4) If the bearing doesnt budge, put it back in in the oven for 10 minutes.
5) Discard the old bearing.
6) Remove the crankshaft from the freezer, the new bearing will just slide onto it.
7) Place the crankshaft+bearing (all fitted) into the freezer for 30-40 minutes
8) When you have around 10 minutes left of waiting, place the crank case in the oven. So in 10 mins time the crankcase will be hot from the oven and the crankshaft will be cold from the freezer.
Now the fun part
9) Place the front bearing back into the crankcase
10) You now need to pull the crankshaft through the crankcase until the bearing seats firmly in position
The first couple of times will be a pain, but it gets easier.
Finally re-assemble the engine.
This post is just collating all the bearing information into one post, from bearing size, to where you can buy them from, to disassembling your engine and finally tot fitting the bearing.
OS50 SX-H
Rear Bearing - 6902 15x28x7mm OPEN BEARING
Front Bearing - R6Z 9.525x22.22x7.14mm SHIELDED (on one side)
OS55 HZ
Rear Bearing - 6902 15x28x7mm OPEN BEARING
Front Bearing - R6Z 9.525x22.22x7.14mm SHIELDED (on one side)
OS91
Rear Bearing - S16003 17x35x8mm OPEN BEARING
Front Bearing - R6Z 9.525x22.22x7.14mm SHIELDED (on one side)
YS56
Rear Bearing - 6902 15x28x7mm OPEN BEARING
Front Bearing - R6Z 9.525x22.22x7.14mm SHIELDED (on one side)
YS 91
Rear Bearing - S16003 17x35x8mm OPEN BEARING
Front Bearing - R6Z 9.525x22.22x7.14mm SHIELDED (on one side)
All the above 50 size engines use the same front and rear bearings, same for the 90 size.
50 size rear bearings
BearingsUK
RCBearings
eBay
50 size front bearings
Simply Bearings
90 size rear bearings
Simply Bearings
eBay
eBay -
90 size front bearings
Simply Bearings
Disassembly guide by Ash Davis can be found here, and well worth a watch.
This is how I change my bearings and has been the easiest/quickest method so far, as ever; there are many different ways to skin a cat.
Once you just have the crank case in your hand you can start to replace the rear bearing;
1) Wait for the Crankshaft to cool down and place in a sandwich bag and leave in the freezer for half hour ('ish).
2) Heat up the over to around 200c
3) Leave the cranks case in the oven for aroun 10 minutes, with an oven glove remove the crank case and gently tap out the bearing.
4) If the bearing doesnt budge, put it back in in the oven for 10 minutes.
5) Discard the old bearing.
6) Remove the crankshaft from the freezer, the new bearing will just slide onto it.
7) Place the crankshaft+bearing (all fitted) into the freezer for 30-40 minutes
8) When you have around 10 minutes left of waiting, place the crank case in the oven. So in 10 mins time the crankcase will be hot from the oven and the crankshaft will be cold from the freezer.
Now the fun part
9) Place the front bearing back into the crankcase
10) You now need to pull the crankshaft through the crankcase until the bearing seats firmly in position
The first couple of times will be a pain, but it gets easier.
Finally re-assemble the engine.
x 3
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