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CB350/400 / Re: Engine rebuild Parts list
« on: March 01, 2024, 06:49:41 PM »I bought a crank & con rods from DK for my 500 - they were as described - the con rods shell were like new. 👍👍👍
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CB350/400 / Re: Engine rebuild Parts list« on: March 01, 2024, 06:49:41 PM »I bought a crank & con rods from DK for my 500 - they were as described - the con rods shell were like new. 👍👍👍 Whats DK? 47
CB350/400 / Re: Engine rebuild Parts list« on: March 01, 2024, 03:35:06 PM »
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 48
CB350/400 / Re: Engine rebuild Parts list« on: March 01, 2024, 02:31:17 PM »Before you go and spend a shed load of cash on new shells get yourself some green plastigauge for £10 and measure the shells you have. Take some photos and post them here and do the same for the mains. The experts on here will be able to advise if the shells are scrap or useable (and assuming they are within tolerance after measuring with the plastigauge). As has been said previously, please make sure you have made a note of where each individual half shall has come from and if it came from the top or bottom crankcase half. Post some photos of the journals as well. One item not mentioned for your parts list is a tube of Hondabond. You will need this when assembling the crankcase halves. It's not cheap and don't be tempted to use instant gasket, you'll regret it when it blocks up the oilways and wrecks a newly rebuilt engine! [/quote] Ive ordered some plastigauge green, should be here next week. My nail doesnt catch on any of the crank case bearings but does slightly catch on the con rod bearings. I went to the engineering firm at lunch today, who fixed my tensioner for his opinion, he's been doing engine work for 40 years and has been recommended by a local restorer who uses him who has done work on previous cb400fs he was restoring. He said they dont seem too bad and would just replace them like for like. I'm going to wait until I can test it with the plastigauge before I pull the trigger on anything. Upper crank case Lower crank case Con rod example Another con rod 49
CB350/400 / Re: Engine rebuild Parts list« on: March 01, 2024, 02:23:44 PM »If you havent looked at crankcase how are you seeing the ends? And they are supposed to be shiney where they bed in, put up pics for advice before spending a fortune I hadnt taken the con rods off then, but I have now. 50
CB350/400 / Re: Engine rebuild Parts list« on: February 28, 2024, 03:22:18 PM »Disagree about shells, inspect yes but replace only if wor and make sure you know where they were originaly I've not looked at the crankshaft bearing just yet but the big end bearings seem ok, still slightly shiny. But I think I may as well replace them. 51
CB350/400 / Re: Engine rebuild Parts list« on: February 26, 2024, 01:04:46 PM »Are the NOS Honda ones new old stock?Sounds like an oxymoron dunnit? FFS I read it completely wrong . I've never seen new old stock abbreviated 52
CB350/400 / Re: Engine rebuild Parts list« on: February 26, 2024, 11:02:37 AM »
Thanks, Laverda Dave, I'll give Nurse Julie/Graham a dm. Not purchased any pistons yet, I'm waiting until I've sorted everything out with the engine. I was just going to go with the Davis Silvers Spares oversized ones so I know they will definitely fit but are there any that might be better?
Are the NOS Honda ones new old stock? 53
CB350/400 / Re: Engine rebuild Parts list« on: February 26, 2024, 08:48:20 AM »I agree with all the above and would add a caveat to the rebore work and that is be very wary of the man down the road who is used to reboring car or British motorcycle engines. Japanese motorcycle engines run very tight tolerances. The individual pistons should be measured and numbered. The bores are machined to suit the individual pistons. Good point Laverda Dave. Ive had a quick search through the forum but couldnt find any mentions, do you know any places in the Northwest you would recommend? 54
CB350/400 / Re: Engine rebuild Parts list« on: February 25, 2024, 06:16:47 PM »Have you priced a rebore recently, the last four sets of 500 i did did not clean at 0.25 as the bores were "barelled" had to go to 0.5 I've not had to rebore anything yet. Im guessing its going to be atleast a couple hundred pounds. I'm going to contact an engine machine specialist near me tomorrow. 55
CB350/400 / Re: Engine rebuild Parts list« on: February 25, 2024, 03:59:41 PM »I guess it depends on what might be wrong. I've just spent £450.oo on parts and £700 for labour, price agreed beforehand, presently my bike is still in the garage. I was advised to get the rebuild because of leaking gaskets and some seals. I opted to get the cam chain, it's 'horseshoe' and tensioner blades complete changed while things are open and a broken piston ring was also found. Nothing else that really matters has come up. Mine is a 1978 CB400F with 40,000 on the clock, the last 12,000 were gentle ones with me. How were the bores? 56
CB350/400 / Re: Engine rebuild Parts list« on: February 25, 2024, 03:30:24 PM »
The bike has done 28k but I dont know how much wear that might cause. I think it might be a case of I'm down there already so get a rebore of 0.25mm done.
Is the estimate of £1200 getting someone else to do it? From the rough estimates in my head, I was expecting 600-700 just for parts and doing 90% of it myself. 57
CB350/400 / Engine rebuild Parts list« on: February 25, 2024, 01:56:38 PM »
After googling and having a look through older posts and not finding anything, I thought I'd ask.
Does anyone know if there is a list of what to replace when doing an engine rebuild? It's my first engine rebuild, the furthest I've been so far is taking the barrels off. What is definitely worth replacing and what is worth replacing because its already stripped? 58
CB350/400 / Re: Allen or hex head bolts?« on: February 22, 2024, 05:38:51 PM »
Thanks! I'll check those out.
Is there a benefit to changing from hex to allen heads? 59
CB350/400 / Allen or hex head bolts?« on: February 22, 2024, 03:16:54 PM »
My engine is fully stripped and the cam tensioner hole has been repaired.
Quite a few of the original hex bolts are worse for wear so I've been looking to get at least the crankcase bolts replaced. Is there a best choice when choosing between allen or hex head bolts? There seem to be a lot more allen head replacements. Can anyone recommend some companies that do sets of bolts? I've seen CMSK mentioned and they do a good range of allen head bolts, but if i can get them from somewhere where I dont have to pay £20+ on postage, that would be great 60
CB350/400 / Re: Engine rebuild questions« on: February 12, 2024, 09:23:50 AM »There is a fix for the adjuster that has an O ring fitted its a SS unit that requires the original thread to be tapped out. I've got the replacement one where you need to tap out the original thread. But it looks like the previous owner did such a bodge job it cant just be tapped out. It looks like the original thread is there and someone has tried to drill it at an angle. |