Rebuilding Old Set of CB750K forks 1974 HONDA

For many years I have rebuilt my own forks, and the transformation is so abundant, I wanted to share what I do in the Barn with you lot and maybe you can have a go at resurrecting your own set?

These tired front forks came off a 1974 CB750 K and Customer wanted Rebuilt and Polished suspension, so this is what I did to these old girls you see here.

The Lowers needed to be stripped apart and then sanded and cleaned then I will polish them to a Chrome finish for that Custom look, lucky Honda cast these quite thick so plenty of meat to polish by hand.

The upper tubes are toast, this is a common issue with the forks as originally Honda fitted fork covers and the  condensation in different heat simply left water droplets sit here and slowly rust the chrome away and into the tubing, you would not notice at all until you took the fork ears off the bike.

I have taken these apart and bought replacement Chrome tubes, then I sanded and buffed the lowers to a mirror finish, I covered in cling wrap to keep clean whilst I assemble these so as to not scratch the surface.

I slid the dampner into the fork tube and then inserted the upper tube into the lower stanchion, this is secure by a Bolt with a Copper washer right under the fork leg, secured with allen wrench and began the rest of the rebuild of these forks.

I have fitted so many of these Fork seals over the years and people always ask me, which way up do you fit these, I tell everybody that when you fit Honda seals, the ID Numbers should be facing you when you look at the seal seated in the fork lower.

Also, many people ask me how I fit my seals into forks, I have seen people use scary tools or hit with a screw driver, usually ending up tearing or making a hole in the seal, so what I have always used is a piece of PVC that I bought 20 years ago from Home Depot, this is the perfect size to insert oil seals .

I simply slide the PVC tubing down the fork leg until it sits on the seal, it fits perfectly and will not bind up as this makes sure that it is level when you tap the seal into the fork leg.

Personally, I use a Rubber Mallet and tap the tubing until I feel the seal bottom out on the inner shelf the fork has and then I know she is all the way home as you will feel the resistance right away and you can see the recess in the fork where the snap ring goes.

Some Honda’s have these snap rings, or as we call them in England ( Circlip ). But some early models had a spring clamp, but this is a snap ring that sits in the bottom of the cup of lower fork and secures the seal into the stanchion.

I use a set of Circlip Pliers but long nose pliers will do as you need to squeeze these together to slip into fork lower then release to lock seal in place.

I then slide the New Dust cap that I sell many off from the website, over the tube and down to the lower, it simply pushes on and sits tightly over the end of the fork and dresses it well.

 

There you go, nice and snug over the lower fork and easy to fit to be honest, and this job can be done pretty much by anyone with minimal tools.

I used New Stainless Lock Washers and Stainless Flange nuts for the bottom cups to finish them off nicely and its ready for Fork oil which is 5 ounces, I use Automatic Transmission fluid, always have and I throw in a couple of stainless washers on top of the spring to set the preload that I like.

And there you go, ready for the customer to fit back onto his Motorcycle and have fun on the tarmac, just thought I would do a little blog on what I do from time to time as many ask me for tips etc, thanks for watching.

The transformation is so cool to see, I often stop and look at what I have accomplished and you will do the same thing for sure.

So have a go at your ones, you may surprise yourself and save some money at the end of the day too.

Any info you may need about anything bike related, email me on carpy@carpyscaferacers.com or text me on 714-598-8392 I am here to help.

 

 

Built a set of Custom forks for a Customer, thought I would share.

Many people have sent me their forks over the years to rebuild, polish or just hop up a bit as they get tired after 40 years of taking punishment from all road surfaces over time.

As the photo shows above, this is the old set that I am going to be working with, I strip these down, clean up and then what I do is machine some cool looking ribs into the stanchions to have that Custom look and then magnaflux it to make sure all is ok.  Once that is done I polish the lowers and then get brand new fork tubes made for the uppers.

I like to use as much Genuine HONDA parts as I possibly can and these will look so clean when everything is put back together and then you fit to your inline four machine.

As you may be able to see, I have New Hard Chromes fork tubes fitted and I have just put the OEM Honda Fork seal in place, here is the trick that I use to fit these seals, also- Remember, make sure the lettering faces upwards not down.

I use a piece of UPVC tubing that I bought from Home depot for about $2.00, this slides down the tubing and sits snug on the seal, but it fits inside the aluminum stanchion perfectly.

I simply tap the Plastic tubing with a Rubber Mallet until the seal bottoms out on the shoulder and there you go, no press needed and no damage at all, I have been doing this method for over 20 years now and never ever have I had a fork that has leaked by using this tubing.

I use some Harbor Freight Circlip pliers to snap the Original 2 hole clip back into the recess inside the fork leg, you will feel it seat when you let the pressure off the pliers.

I use as much genuine Factory parts where ever possible, and in this case I use New old stock Dampner Bolt and Copper crush washer, just to make sure all is new and fits as it is supposed to.

I use genuine Honda Dust caps to make sure all the crap stays away from the forks, then- Just to add some super cool Custom finishing, I like the way these complete that Custom styling on the front end.

See what I mean? Its a nice Custom finished look that really does not cost a lot of money and it is chrome, no plastic crap.

I have always used ATF for forks, the old Pro Racers mechanics used it and I still do today, I also used stainless washers on top of the springs to set the pre-load.

That’s is how much I pour into rebuilt forks and people ask me “How do you know how much to pour in”?

This is one of my Bibles that I use on things like fluids, point gap, timing and the like, always served me well.

I also make sure that ALL the threaded holes are chased through with a tap, this makes sure that the refit goes smoothly and you dont scratch the lovely polishing I have done.

I make sure that I hand polish the lower clamps and use stainless nuts and lock washers, this set up is really a thing of beauty and I am so stoked when I complete a set for a customer, a lot of work and time, but boy is it worth it and changes the look of the front end.

A great looking set of Lowers that will turn heads where ever you go, not a five minute job and not made in China either, all done from right here in California.

These are now ready to ship out to the Customer, so he can easily fit them in to his triple tree’s.

Just take a look at them, what a cool set up these are and all New hardware, Hope that you enjoyed this blog about that what I do with the good old inline fours.

Let me know if I can help you with your Honda, I have been doing it here in California for 20 years and never tire of it, it is a passion of mine that I hope shows in my work?

Thanks for taking your time to read my Blog and hope it may of inspired you to work on your machine?