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CB400 Project
tom400f:
Crikey slow down!
http://www.cmsnl.com/products/piston-set-025_00000kit0506/#.Va5hHvkYFys
0.25 oversize kit (after market). Anyone know if these are good?
Packing washers - previous knob couldn't match the bolt lengths and got lazy? May be you'll find a short one elsewhere in the cases ::)
Chris400F:
I agree with Tom, quite possibly just the wrong bolt in that hole and a lazy owner.
If you look at the parts list you will find all the bolt lengths are given in there so you can check what should be fitted (M8 x 114 I think).
(Personally I find a paper copy is useful to have as well as an electronic one and was a good investment; maybe that's just me!).
I suspect it is possible to buy a replacement set of bolts from somewhere, but that's more expense.
beemsquar:
The crankcase has packing washers on every bolt too! I will definitely replace all the bolts with new and clean up all the internal threads, possibly buy a full stainless steel hex set or just ordinary bolt set.
At least that way I won't have any issues when I come to torque everything up and I know i've done the best I can.
I might try and print the parts list off at work tomorrow as I agree, it's much easier to thumb the pages then read on a laptop with oily hands.
Tom, that looks a reasonable price for a full set of pistons, I was looking at this on eBay.
http://www.ebay.co.uk/itm/391177502510?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Any ideas why the gudgeon pins would look like that and the piston ring disintegrated on removing the block?
I didn't test the cylinder pressure before I dismantled as I didn't have the tool to do it and had already bought a shed load of specialist tools and hardly any parts for the bike at that point, wish I had now just to have some more info.
So how can I tell if it's already had a rebore? Someones clearly had the head off at some point and maybe the block, not sure what signs to look for, It looks pretty clean inside for its age and all things considered.
I've only tinkered on old cars in the past and they have always been a lot worse inside, especially the Triumph Spitfire I restored a few years back, but that turned out alright in the end, hopefully this will too, maybe just more money than I first anticipated.
Bryanj:
Thats a normal looking pin and you can "Feel" wear with your finger that can not be measured with a Mic so as you are going oversize dont worry, piston rings do break, more on some models than others, if you had a K4 250 and did not let it warm up before you rode hard it would shatter rinrs
Chris400F:
--- Quote from: beemsquar on July 21, 2015, 04:51:55 PM ---I might try and print the parts list off at work tomorrow as I agree, it's much easier to thumb the pages then read on a laptop with oily hands.
--- End quote ---
If you have the time and facilities then by all means print the list, otherwise at £12 delivered this one seems good value:
http://www.ebay.co.uk/itm/Honda-Parts-List-Book-CB400F-400-4-400-Four-1970s-Reproduction-Original-Honda-/251407786645?pt=LH_DefaultDomain_3&hash=item3a89126295
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