Main bearings

[frostoff]

Is it much of a job to replace the main bearings on my AR or should I send it to someone to do? if so any recommendations to where to have it done bearing in mind I live in Cornwall>

[Speeddevice]

The hard part is splitting the case and being able to get the gearbox back together with everything in the right spot. Not impossible but it does take a bit of attention to detail and some fiddling to get it all right.

And you have to make sure the bearings have the right clearance. I think it is C3 which as slightly greater internal clearance for running at the elevated temperatures in the crankcase. Could be worthwhile truing the crank if you get it that far apart.

[fallenmikethebike]

Is it much of a job to replace the main bearings on my AR or should I send it to someone to do? if so any recommendations to where to have it done bearing in mind I live in Cornwall>

I would certainly advocate getting this done by a professional mechanic who will have all the various pullers and clamps to hand, not to mention the experience to bring to the task.
If your splitting the cases, you would want to be sure the big end has good length of service left in it.
You can get the whole engine couriered to L.T. or someone similar, get some quotes done and then have a think about it.
Mike

[frostoff]

Thanks that is what I was thinking. will give L.T a ring and see what they say.