CBR600F4i Showa shock remote reservoir hose MOD

[E.Marquez]

Ive searched the Net, this forum, US SH forum.....VFR forums, CBR forums... and come up blank.
Has anyone changed out the hydraulic reservoir hose ona showa shock?

DMr uses the CBR600 F4i shock as a base for his custom fitted and valved VTR1000F shocks.
Im looking to replace the reservoir hose, it is an M10 banjo bolt on one side, M10x1.0mm straight thread on the other that goes into the shock body.
I have a research F4i shock on the way just purchased to do some measuring and look at but was trying to get ahead of the ball as well.

I need to know if that M10x1.0mm straight thread hose fitting is sealed by crush washer? or O ring?
I need to know the ID of the through hole in the stock fittings, and hose.. I've been warned, not to cause a restriction buy using something smaller than stock.
I really assumed someone wold have replaced that ugly black rubber hose with an aftermarket SS line and pretty anodized fittings by now, but darn if I can find a thread on that.

[Wicky]

I've had the hose replaced on my shock - it was done when I had it serviced by suspension specialists.

http://www.vtr1000.org/phpBB3/viewtopic ... 45#p386688

Wouldn't it be best to ask Jamie on your side of the ocean what's required.

http://www.daughertymotorsports.com/vtr ... 1000f.html

[E.Marquez]

I've had the hose replaced on my shock - it was done when I had it serviced by suspension specialists.

http://www.vtr1000.org/phpBB3/viewtopic ... 45#p386688

Wouldn't it be best to ask Jamie on your side of the ocean what's required.

http://www.daughertymotorsports.com/vtr ... 1000f.html

I have
He will
For him its a "Custom job" meaning $$$$ as he does not have a source for the hose fitting to the body.. seems its a unicorn so far... heard about, read about but never seen in person.

You had a hose replaced on a Ohlins not a Showa shock yes? If so, much different fittings.
Building a new hose for a showa shock that uses a straight thread M10x1.0 fitting that seems to be specific top this application is proving to be more difficult.
looks to be easier to just cut the old fitting off and tig weld a new one in common size on to the body.. and that's just nuts.
Or machine a custom fitting in house
or take Jamie up on his proven solution that uses hose and fitting of his own making and design

[E.Marquez]

My spare CBR600F4i shock arrived and disassembly has taken place.
The biggest concern was ID of the OEM hose fittings. Jamie cautioned me to not restrict the fluid flow.

The Min OEM hose fitting ID is .156, that is smaller than all brand of -4 AN hose I have found, so good there.
After contacting Holley (makers of Earls Plumbing) I have the inside dia of the metric adapter I will need to use a -4 hose and AN fittings to make this new shock line. I will have to bore the ID of the adapter on the 10mm side a few thousands to bring it up to the min size of the OEM fitting. The ID on the -4 AN side of the adapter is .178 so larger then the needed .156

Another concern is the Min ID of the 10mm banjo hose -4AN hose end...

Waiting on the technical drawing and response from Holley on that one now. It is steel and so not really to concerned, if it is undersized slightly I will just bore it out as well.

These fittings will have no significant lateral stress on them, so Im am not overly concerned* with the reduction of cross section to cause or leading to a fracture

I had asked the question"I need to know if that M10x1.0mm straight thread hose fitting is sealed by crush washer? or O ring?"
The answer is copper sealing washer... and Holley confirms their adapter is designed to use a sealing washer or O ring..so good there.

I have to purchase the required hose in a 10 foot section which drives the cost way up...when I only need a few inches,, but what the heck, spares will get used someplace, sometime.
The Earl's Speed Flex hoses has a PTEF liner and Stainless steel overbraid. The hose designed for hydraulic application, both cold and hot fluid. The -4 An hose I'll use has a ID of .190 and a min allowable bend radius of 1.5" which works out just fine for the bend needed in this application.. The OEM hose has a 3" bend radius installed now...

* see elsewhere on the forum for how my guesstimate engineering worked out on rear brake adapters...lol

[sirch345]

Very interesting reading. When you read your title you'd think it can't be that difficult, it's only when you start looking into what is required you realise it's not so straightforward.

Good luck in achieving what you need.

* see elsewhere on the forum for how my guesstimate engineering worked out on rear brake adapters...lol

I thought you would rather forget that
One thing that did go through my mind on that was, the set up you had meant the anchor rod was being pulled when the brake was being applied. Had the load been pushing on the anchor rod may be it would have coped with the strain, only a thought,

Chris.

[E.Marquez]

I thought you would rather forget that
One thing that did go through my mind on that was, the set up you had meant the anchor rod was being pulled when the brake was being applied. Had the load been pushing on the anchor rod may be it would have coped with the strain, only a thought,

Chris.

That set up was a failure prone for two reasons..
The strut wall thickness at the caliper end
The strut rod weakness was addressed with design and material selection. It now has more inherent strength than any other component

The caliper mount strut attachment
This is still a weak point... 1/2 dozen stomps on the rear brake with good traction will bust the strut mount off the caliper mount. It is being addressed by way of modifying a caliper mount designed for under akel use, and designed to be located with a strut rod, exactly like Im using. The axle hole in the new mount is too large for the VTR axle, the mount width is wrong and the center of the mount axle hole is not the correct off set for the VTR disk diameter. All three things are fixed with the same modification part.. a new wheel spacer that will also act as a offset bushing in the caliper mount... Normally the axle just passes through a caliper mount and is sandwiched between swingarm and wheel spacer. I am machining a new spacer/bushing. Im on version 3 now..... might get to it this weekend after I get done teaching class. In the meantime,,,,,,I dont stomp on the rear brake...lol

[E.Marquez]

Another concern is the Min ID of the 10mm banjo hose -4AN hose end...

Waiting on the technical drawing and response from Holley on that one now. It is steel and so not really to concerned, if it is undersized slightly I will just bore it out as well.

Holley Tech refused to send out a Tech drawing (thanks you tw@) but they did confirm the MIN ID is larger than .156" so there will be no flow issues with this new line.

[mik_str]

Not always easy, being a pioneer... good luck

[Stephan]

I would like to change old hose on my shock too. After reading it, I consider new Nitron instead

[sirch345]

I thought you would rather forget that
One thing that did go through my mind on that was, the set up you had meant the anchor rod was being pulled when the brake was being applied. Had the load been pushing on the anchor rod may be it would have coped with the strain, only a thought,

Chris.

That set up was a failure prone for two reasons..
The strut wall thickness at the caliper end
The strut rod weakness was addressed with design and material selection. It now has more inherent strength than any other component

The caliper mount strut attachment
This is still a weak point... 1/2 dozen stomps on the rear brake with good traction will bust the strut mount off the caliper mount. It is being addressed by way of modifying a caliper mount designed for under akel use, and designed to be located with a strut rod, exactly like Im using. The axle hole in the new mount is too large for the VTR axle, the mount width is wrong and the center of the mount axle hole is not the correct off set for the VTR disk diameter. All three things are fixed with the same modification part.. a new wheel spacer that will also act as a offset bushing in the caliper mount... Normally the axle just passes through a caliper mount and is sandwiched between swingarm and wheel spacer. I am machining a new spacer/bushing. Im on version 3 now..... might get to it this weekend after I get done teaching class. In the meantime,,,,,,I dont stomp on the rear brake...lol

Good luck with it, not stomping on the rear brake atm seems like a very good idea,

Chris.