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The /2 crank has no centre bearing – it’s like a wet noodle.
The R69 can go more than 1000 rpm faster than a /2 and has the damper in front and a special bearing in the rear to help save the crank.
The vibration damper on the front of the generator, which is the front of the crankshaft, is to counteract the flex of the crank at high rpm.
Whatever flexing the damper does not cancel out, the special rear bearing then absorbs.
(Part# 99113065R).
This rear main bearing on the R69 is a special spherical bearing to allow the crank to flex at high rpm without damage. Imagine a bearing that allows you to move the shaft up and down as you turn it.
Just a note to say thanks. Great help from the guys yesterday, especially Brian who patiently discussed my clutch problem with me. Ordered the parts at about lunchtime and nearly tripped over the package this morning at 08.30 when I was going out the front door!! Not bad for Perth to Sydney, and all the bits available for my 30 plus year old bike too. Hopefully I’ll be on the road for the weekend as planned.
Hi Thanks so much for your fantastic service. My part has arrived in Kununurra already so I will be able to fit it tonight. Most deliveries take about a week so thanks again. Cheers