Engine rebuild Parts list

[Nurse Julie]

Your engine has suffered from oil starvation or dirty oil, those shells don't look good.

[Bryanj]

Neither does the journal surface and i agree with Julie not enough oil changes, i would look for a better crank, possibly with rods and replace the mains

[Laverda Dave]

I know that photos can make journal's appear worse than they actually are but looking at those I would do as Bryanj suggested, find another crank. If you replace those worn shells with new and use that same crank you'll be wasting your money and time. Same goes for the big ends.

[Dolomite_]

I'll give a good clean tonight or tomorrow and get rid of all the oil and grime. Its my first time doing a rebuild but it doesnt seem too far from these replacement crankshafts.
https://www.ebay.co.uk/itm/375274886316?itmmeta=01HQXA10VEERSW3BT3Y66F6C4R&hash=item57602054ac:g:o84AAOSwrFdkoB9r&itmprp=enc%3AAQAIAAAA8AKr4Ep4hVTll7AIMNUs5vK1xxCRmHXus9Yx3rmrZk5CIOoba1BWmYU%2FbUVe1KdN98AJY%2FkMjnFxa4%2BdqVhws3HE4MtLbs9V8HRSd1DBc4xQdrTuTPdEMyfIGCqpem4Ds0SuJSn9wEI3TOLUcjNqXsIgJD8xoDjJuB%2F1z0oQlqZ0nBxUw3DG80g2mJVXP6Yz1e%2FJMq4SfdaGKe44zB25wJ0lInFKlFqbST%2BezZBZxKtg8zQmNhWjpKXhwXfo%2F3MsxG3nZPJS6pYoDx%2BuD0zaGetIgO5%2FWzu%2FXd3jveFJ9Ln%2Bxr2QtlKyMwtg5IuhrLtreQ%3D%3D%7Ctkp%3ABk9SR-SNhKq_Yw

https://www.ebay.co.uk/itm/204673292768?itmmeta=01HQXA10VE5YNYFQNRPQ4YSX8C&hash=item2fa77a99e0:g:RDQAAOSwBfRlw7JN&itmprp=enc%3AAQAIAAAA0FqCbxO1e6qmujg7mrLyab2Or9HCuS6dvjx2KgdPQ4xMOPVdPoASoOyTuGxMEuVuQWU0FH6Ge1Ub3nnnWlNm2N5kvx5CA1gahlQsh8hn2XkNLrxAlit7b8Y2cTTbqduHvrRm0BG7Cqm711Mi25pk4te2yAUf0Cxm%2B%2FzRI3C3scZxVe8xqp0tqnFKPQTdmKGZIX4PjOHt%2BzLFVLSpkGnBYeF%2B9nLEKQl6FBSi9gY%2FwfeyrW9N7a48QPzZ9r2RmdngbxZDtO4J91vXKCB2pbbugRU%3D%7Ctkp%3ABk9SR-SNhKq_Yw

Update, Julie has just updated me regarding my rebore. Looks like there was silicone mastic blocking some oil passages. Regarding a replacement crankshaft, they dont seem too bad price wise.

Would it be more hassle trying to get new bearings to fit a new crankshaft and my current con rods? Or would it be easier to fit new bearing to a crankshaft that comes with the con rods?

There are 2 on ebay. Option 1 https://tinyurl.com/mrxffku7 Option 2 https://tinyurl.com/mu7fny3e

Without con rods. Option 1 https://tinyurl.com/3fcbp249 option 2 https://tinyurl.com/y6un5ha9
 

[McCabe-Thiele (Ted)]

I bought a crank & con rods from DK for my 500 - they were as described - the con rods shell were like new. 👍👍👍

[Dolomite_]

I bought a crank & con rods from DK for my 500 - they were as described - the con rods shell were like new. 👍👍👍

Whats DK?

[Dolomite_]

So after doing some googling and watching videos on how to measure the crankshaft, I've ordered a micrometer. So I'll try to measure and work out the sizings for the shells, buy 1 set, measure with plastigauge then order a full set of shells or 1 set of the next size up and plastigauge again.

Could I get some opinions on the crankshafts I have linked?

400fourbits also has one for sale. https://400fourbits.co.uk/

After Teds recommendation could someone take a look at these 2 options https://www.ebay.co.uk/itm/312044879538?itmmeta=01HQXPVR92HVDMQ5AS8Q6HNVN8&hash=item48a752feb2:g:ZS4AAOSwi0lg3u8q and https://www.ebay.co.uk/itm/313344578679?itmmeta=01HQXPVR92FYBSGWTXTKKDEPWH&hash=item48f4cad477:g:13QAAOSw5FRgbExl

Or if any of the other ones I've linked seem good let me know.

[McCabe-Thiele (Ted)]

I bought a crank & con rods from DK for my 500 - they were as described - the con rods shell were like new. 👍👍👍

Whats DK?

dkmotorcyclespares  an eBay shop they break imported bikes. They also have a website iirc.

[Bryanj]

If 400four bits has one he is a member on here as as far as i know fully trustworthy.
Personaly i would buy crank and rods as chances are the big ends would be ok and you would only need to buy mains.
No offence meant but if you are ordering a micrometer to measure the mains you wont be accurate enough, the correct use of mics is an art and the accuracy required is not easy to learn, you would be better taking it to a good engineering firm for accuracy

[McCabe-Thiele (Ted)]

I second what Bryan has said I bought a Micrometer that in all honesty was not really accurate enough - I relied heavily on the use of Plastigauge - that stuff is not always as easy to use as it sounds if like me you do not have an engineering background.

I have found Steve at 400 bits gives an honest description as to condition as does DK.

[Dolomite_]

If 400four bits has one he is a member on here as as far as i know fully trustworthy.
Personaly i would buy crank and rods as chances are the big ends would be ok and you would only need to buy mains.
No offence meant but if you are ordering a micrometer to measure the mains you wont be accurate enough, the correct use of mics is an art and the accuracy required is not easy to learn, you would be better taking it to a good engineering firm for accuracy

just thought I'd give it a go with a micrometer and plastigauge. If crank and rods are the way to go I'll do that.

What would you go for out of these two: option 1 https://www.ebay.co.uk/itm/312044879538?itmmeta=01HQXPVR92HVDMQ5AS8Q6HNVN8&hash=item48a752feb2:g:ZS4AAOSwi0lg3u8q

option 2 https://www.ebay.co.uk/itm/313344578679?itmmeta=01HQXPVR92FYBSGWTXTKKDEPWH&hash=item48f4cad477:g:13QAAOSw5FRgbExl

[Bryanj]

Both those look same to me and would save you spending roughly £80 on big end shells.
Plastigauge is accurat when used correctly but you need a main bearing pin size to start from.
What are the letter codes from the rear of your crankcases?

[Bryanj]

Where in northwest are you as i have family up round Bury/Ramsbottom

[Dolomite_]

Both those look same to me and would save you spending roughly £80 on big end shells.
Plastigauge is accurat when used correctly but you need a main bearing pin size to start from.
What are the letter codes from the rear of your crankcases?

The crankcase code is BAAAA.

I'm near Preston.

[McCabe-Thiele (Ted)]

It does help if you are able to identify by the colour marks on the edge of one of the "A" mains journals as that gives you a starting point. Probably Green or Brown.