Honda-SOHC
SOHC.co.uk Forums => Anorak's Corner => Topic started by: AshimotoK0 on February 17, 2023, 11:37:49 AM
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The special stepped bolts and rubber cushion washers for my CB250K's UK front guards are NLA so I am making the bolts from 12mm AF mild steel bar. Luckily they were zinc plated and not chromed on this model, so I can plate them myself. 12mm mild steel hex bar was a bit tricky to find though and had to buy 3 metres but really handy for making Honda fasteners. The part was originally a JDM part and very expensive when CMS last had stock, ages ago (none available now)
The rubber 'cushions' are NLA too ...they are actually a CB450K1 part and only used on the European/JDM/ Canada CB250K's, UK CB350K4 that had the deeply valenced mudguards. I decided to mould these myself using 70 Shore 'A' black polyurethane (PU) and I got a mould 3-D printed at work. I think they turned out great for a first attempt.
The next thing I am going to have a bash at are the rubber seals between the air filter and the balance tube, which is part of the battery box. These are often lost or knackered and hard to find now.
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Top fiddling that Ash, they look fantastic!
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Indeed, great work there! 👍
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Forgive my ignorance Ash not sure what I am looking at - is that two halves of a mould you have made so you can make eight at once?
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The special stepped bolts and rubber cushion washers for my CB250K's UK front guards are NLA so I am making the bolts from 12mm AF mild steel bar. Luckily they were zinc plated and not chromed on this model, so I can plate them myself. 12mm mild steel hex bar was a bit tricky to find though and had to buy 3 metres but really handy for making Honda fasteners. The part was originally a JDM part and very expensive when CMS last had stock, ages ago (none available now)
The rubber 'cushions' are NLA too ...they are actually a CB450K1 part and only used on the European/JDM/ Canada CB250K's, UK CB350K4 that had the deeply valenced mudguards. I decided to mould these myself using 70 Shore 'A' black polyurethane (PU) and I got a mould 3-D printed at work. I think they turned out great for a first attempt.
Mine are missing Ash, so I'd be interested in 2 if they fit the 350k0 please
The next thing I am going to have a bash at are the rubber seals between the air filter and the balance tube, which is part of the battery box. These are often lost or knackered and hard to find now.
(Attachment Link) (Attachment Link)
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(Attachment Link) (Attachment Link)
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I don't think your mudguard used those washers Phil or do you mean the air filter ones?
Rubber stay cushion washer fits these models
FITS MODELS
CB250 GENERAL EXPORT
CB250 JAPAN
CB250K0 AUSTRALIA
CB250K0 BELGIUM
CB250K0 ENGLAND
CB250K0 FRANCE
CB250K0 GENERAL EXPORT
CB250K0 GERMANY
CB250K3
CB250K3 GENERAL EXPORT
CB250K4 ENGLAND
CB250K4 FRANCE
CB250K4 GERMANY
CB350 GENERAL EXPORT
CB350 JAPAN
CB350K0 SUPER SPORT AUSTRALIA
CB350K0 SUPER SPORT BELGIUM
CB350K0 SUPER SPORT ENGLAND
CB350K0 SUPER SPORT FRANCE
CB350K0 SUPER SPORT GENERAL EXPORT
CB350K0 SUPER SPORT GERMANY
CB350K3
CB350K3 SUPER SPORT GENERAL EXPORT
CB350K4 ENGLAND
CB350K4 FRANCE
CB350K4 GERMANY
CB350P GENERAL EXPORT
CB350P JAPAN
CB350P0 GENERAL EXPORT
CB350P4 POLICE TYPE GENERAL EXPORT / KPH MPH
CB450
CB450K1 1968 USA
CB450K1 U.S.A
CB450K2 1969 USA
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I don't think your mudguard used those washers Phil or do you mean the air filter ones?
Rubber stay cushion washer fits these models
FITS MODELS
CB250 GENERAL EXPORT
CB250 JAPAN
CB250K0 AUSTRALIA
CB250K0 BELGIUM
CB250K0 ENGLAND
CB250K0 FRANCE
CB250K0 GENERAL EXPORT
CB250K0 GERMANY
CB250K3
CB250K3 GENERAL EXPORT
CB250K4 ENGLAND
CB250K4 FRANCE
CB250K4 GERMANY
CB350 GENERAL EXPORT
CB350 JAPAN
CB350K0 SUPER SPORT AUSTRALIA
CB350K0 SUPER SPORT BELGIUM
CB350K0 SUPER SPORT ENGLAND
CB350K0 SUPER SPORT FRANCE
CB350K0 SUPER SPORT GENERAL EXPORT
CB350K0 SUPER SPORT GERMANY
CB350K3
CB350K3 SUPER SPORT GENERAL EXPORT
CB350K4 ENGLAND
CB350K4 FRANCE
CB350K4 GERMANY
CB350P GENERAL EXPORT
CB350P JAPAN
CB350P0 GENERAL EXPORT
CB350P4 POLICE TYPE GENERAL EXPORT / KPH MPH
CB450
CB450K1 1968 USA
CB450K1 U.S.A
CB450K2 1969 USA
Yes, air filter balance tube rubbers Ash
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Nice work Ash. A lot of time & effort put in there to get a perfect result👍
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Yes, air filter balance tube rubbers Ash
OK .. may be a few weeks before I can get a mould done though.
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Fascinating!!
Where do you get your PU rubber stuff from? I have been contemplating trying something similar for an unrelated application making tyres for an RC tank project ....
I can make the 3d printed mould quite easily. I assume the compound just gets poured into the lower mould, and the top clamped down, with some vent holes to let the excess out, and to pressurise the mould to get any air bubbles out. Would potentially also allow me to 3D print the wheels first...put hte wheels in the mould, and cast tyres around them to 'key' them in.
I tried making footrest rubbers once in a plaster mould. The stuff I had to mould with was horrid, and the results fit only for the bin. Never thought to 3D print a mould. Obvious when someone else does it......
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Fascinating!!
Where do you get your PU rubber stuff from? I have been contemplating trying something similar for an unrelated application making tyres for an RC tank project ....
I can make the 3d printed mould quite easily. I assume the compound just gets poured into the lower mould, and the top clamped down, with some vent holes to let the excess out, and to pressurise the mould to get any air bubbles out. Would potentially also allow me to 3D print the wheels first...put hte wheels in the mould, and cast tyres around them to 'key' them in.
I tried making footrest rubbers once in a plaster mould. The stuff I had to mould with was horrid, and the results fit only for the bin. Never thought to 3D print a mould. Obvious when someone else does it......
Yes ... as you described exactly .. I brushed mould initially with silicone oil and then wiped most of it off.
Here is the PU .. they also do much larger quantities and different hardness's https://www.ebay.co.uk/itm/255524412219
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:) thanks for the link!
Will give some of this a go and see how I get on.
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Look great. The 3d printing is no problem, but presumably I need a vac pump and maybe also a pressure vessel.
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Look great. The 3d printing is no problem, but presumably I need a vac pump and maybe also a pressure vessel.
I have a vac pump etc but didn't need it .. if your pour carefully and mix the PU and then play a heat gun on the surface of the PU very quickly, any small bubbles expand and pop. Also the top cover of my mould acts as a piston to force the excess out of the top sprue holes (two sprue holes/piece) and the product looked pretty bubble free. However, not so sure about large moulded pieces.... you may need to vacuum it.
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Brilliant idea. Going to give it a try too. Thanks for sharing!