Trials Trail & Enduro Parts > 1. Yamaha TY Trials Parts > TY250 Twinshock Parts > 4. Crankshaft & Piston
13. Crankshaft Main Bearings - 1 pair - TY250 Twinshock
£17.28
OEM Bearings
Pair Of Crank Main Bearings
OEM Bearings x 2
OEM Bearings x 2
Standard equipment on all years and models of TY250 Twinshock including 320, 340 & 360 Majesty.
These are a pair of crankshaft main bearing manufactured to C3 specification which relates to the tolerances required for the speed and temperature these bearings run at.
There are other bearings of this size available with a different bearing specification that are cheaper but not up to the job and will fail.
Manufactured by NTN, NSK or Koyo depending what is available, all are OEM bearings, check the ones you take out.
Beware cheap bearings from the far east!
When fitting or removing crank bearings remember the crankcase has to be REALLY hot. Rule of thumb is if you spit on the cases and it just rolls off rather than evaporating the cases are hot enough.
When fitting the bearing to the flywheel side drop the crank in soon after fitting the bearing as the bearing will have expanded enough to take it. If you let the case cool down before fitting the crank then you will have to use a big hammer which will terminally damage the thread on the other end, even with the nut fitted. We have seen this many times, the thread can be fixed but is expensive and you will damage the new bearing fitted in the case so it will need replaced aswell.
There are a number of ways to get the casing hot enough.
1. Bake in the oven for 20 minutes, the wife may not like this though!
2. Blow torch for about 10-15 minutes
3. Our preferred option is to use a hot air gun, the paint stripping type for about 10-15 minutes per case. Much safer option and keeps the workshop nice and warm on the cold winter days.
When fitting the bearing to the flywheel side drop the crank in soon after fitting the bearing as the bearing will have expanded enough to take it. If you let the case cool down before fitting the crank then you will have to use a big hammer which will terminally damage the thread on the other end, even with the nut fitted. We have seen this many times, the thread can be fixed but is expensive and you will damage the new bearing fitted in the case so it will need replaced aswell.
There are a number of ways to get the casing hot enough.
1. Bake in the oven for 20 minutes, the wife may not like this though!
2. Blow torch for about 10-15 minutes
3. Our preferred option is to use a hot air gun, the paint stripping type for about 10-15 minutes per case. Much safer option and keeps the workshop nice and warm on the cold winter days.
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