SOHC.co.uk Forums > CB500/550
New frame/engine bolts. What type?
davidcumbria:
--- Quote from: DomP on November 23, 2023, 08:50:50 PM ---Good points by Ken and Ted, I wasn't worried about thread pitch as the engine mounting bolts are all going onto their own nuts but I hadn't considered this with the lower yoke pinch bolts. Are they standard 1.5mm pitch on the m10 bolts?
I might have to have a rethink on the lower engine mounts.
--- End quote ---
Just been through all this. IIRC Kay fast and middletons don’t have t some of the bolts in the correct pitch and I ended up getting them from china on ebay( bottom yoke maybe) what I have found is that by grinding off the lettering , polishing up with the brush wheels and bench polisher the heads can quite easily end up with a mirror finish.
https://www.ebay.co.uk/itm/354792939265?var=624112326971
Oddjob:
--- Quote from: davidcumbria on November 24, 2023, 08:08:12 AM ---
--- Quote from: DomP on November 23, 2023, 08:50:50 PM ---Good points by Ken and Ted, I wasn't worried about thread pitch as the engine mounting bolts are all going onto their own nuts but I hadn't considered this with the lower yoke pinch bolts. Are they standard 1.5mm pitch on the m10 bolts?
I might have to have a rethink on the lower engine mounts.
--- End quote ---
Just been through all this. IIRC Kay fast and middletons don’t have t some of the bolts in the correct pitch and I ended up getting them from china on ebay( bottom yoke maybe) what I have found is that by grinding off the lettering , polishing up with the brush wheels and bench polisher the heads can quite easily end up with a mirror finish.
https://www.ebay.co.uk/itm/354792939265?var=624112326971
--- End quote ---
The bottom yoke pinch bolt is 10 x 35mm Dave. it's a 1.25 pitch. Exactly what Dave Middletons lists on this page https://www.stainlessmiddleton.co.uk/32908-metric-fine-bolts-setscrews the big difference is that Dave Middletons has the correct head size at 14mm, that and the price I suppose, plus it's not a set bolt, meaning unless he's listed it wrong it will only be part threaded like the original, unlike the chinese copies. A 17mm head size in that location looks wrong IMO, they tend to overhang the yoke itself. The original bolt only used a spring washer under the head, I find doing that can scrape the paint off as it spins before it digs in and compresses, I'd advise using a flat washer under the spring as well, if needed increase the length to 40mm as there is usually 5mm of unused thread on most of the Honda bolts. You could trim a couple of mm off if needed.
Forgot to mention, the top yoke pinch bolts on the 500 are easy to find, the ones used on the 550 are not as they are 7mm not 8mm, those are some of the only original bolts left on my bike. Even sourced the 3 small crosshead screws used on the idiot panel in stainless.
Seabeowner:
93201-100-350B £2.21 at DSS and good if you are ordering other bits at same time to save postage.
DomP:
I've just been thinking, you say the m10 bolts on Hondas are metric fine thread with 14mm heads but the front engine mount bolts, don't they need to be 17mm heads so they are held captive in the cases as they are tightened?
Any idea what pitch the rear shock lower bolts are?
Oddjob:
It's the nuts which are locked by the crankcases Dom, the bolt head is on the outside of the hanger bracket. Same for the lower bolts under the points etc The nuts would also need to be metric fine as well BTW Dom. He doesn't do M10 17mm metric fine nuts though so maybe using standard metric M10 bolts might be a good idea in those locations. Or use these.
https://www.ebay.co.uk/itm/285567726891?var=587531291986&hash=item427d29b52b:g:r2wAAOSwzFllL4at&amdata=enc%3AAQAIAAAA0Epu6WtmmRstnoacdwXADmYrdZ%2BXmv0%2F72K9kZo%2F1SIdnmDSf4HG5VLzckl0zP5q1C6Bhml%2Bb4tLWOldXViSABnI93xZ8sNOAb0GeQbNBBaqIMMcDxe9UbG1ojZ6XUCgTwQ0pkmmKL8N0VKtFcbVAIrjCERX%2BN%2BuhXTDb%2FkxeJrFC0jLFcyTq0XrcgaW2h%2B2vXStQaCaenHzFa6KlyJxsLdZQVeYMw0zKjtH7ZaU4QukVHFt30bIleEpQ04pdsfi4uWZrMLlBtRX1mSct57q6oo%3D%7Ctkp%3ABk9SR9L4jfuAYw
Rear shocks if genuine would be metric fine BUT aftermarket could be any, you'd need to check, my Marzocchis for instance are standard metric thread at 1.5mm.
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