CR 750 for road use build

[philward]

Cycle x 4 - 4 exhaust is not a CR rep exhaust - its just a 4 into 4 exhaust. if you want a 'replica' exhaust, the Simon Tappin exhaust is what you want - its fitted to this Australian built rep
In my opinion, the quality is excellent - as Steve says you need to speak to Simon - he is an expert on CR750 and is very helpful

[captaink]

A bit of an update on the engine build.
All the 6mm threads had a tap run down them to ensure all would be a good fit.
Where the process of aqua cleaning involves minute glass bead, I was extra careful to ensure all this was washed out and had to run a M20 x 1.25 tap down the oil filter thread to clean out.
I'm happy it's 100% clean.
Having settled with main and rod clearance of 0.040mm using black shells throughout and the rods torqued to 14.5 lbs its all together
Cylinder barrels are back from being bored out 836cc with a big bore kit and the top skimmed and a nice job they have done again.
After checking the ring gaps in the bores there all 14 thou on top rings and 16 thou on the middle and oil rings. So I'm happy with that.
The cases are now together.
New drive chains and cam chain

[captaink]

Cylinder bored and skimmed. 
Yes I know the tip of one fin is broken 

[CR21]

Looking great, nice finish to the casings as well. How did the general assembly go of the engine, was it relatively straight forward?

Out of interest did you have the casings ultrasonically cleaned after the vapour blasting process and are you going to leave them like that or paint them? I have always thought that the vapour blasting (and sometimes vibratory finishing) leaves a 'fresh cast' look, and have gone down this route with several other restorations. Until I bought the CB750 donor bike I was unaware that the casings were painted, not sure If I want to paint mine...

The cylinder work looks smart, is that a UK company? Also what pistons are you running?

Cheers
CR21

[Trigger]

Even after the engine cases are clean, you will still have to paint them as oxidation sets in fast. Honda cast alloy is not the best on it comes to corrosion.

[CR21]

Even after the engine cases are clean, you will still have to paint them as oxidation sets in fast. Honda cast alloy is not the best on it comes to corrosion.

Interesting, obviously from an experienced builder like you this is worth definitely noting! Do you think this is the case even if they are vapour blasted / vibropolished and kept clean with something like AC50? The yam castings seem to last well like this but as I have said this is my first Honda!

Cheers,
CR21

[Trigger]

When vapour blasting first came about, I had I lot of people requesting this finish. 5 years on those same engines are back in for chemical cleaning and painting. Why do you think Honda painted them in the first place 
British bikes, with old british alloy look great and last a long time after vapour cleaning.

[CR21]

When vapour blasting first came about, I had I lot of people requesting this finish. 5 years on those same engines are back in for chemical cleaning and painting. Why do you think Honda painted them in the first place 
British bikes, with old british alloy look great and last a long time after vapour cleaning.

Interesting, I guess they were painted for a reason... Strange as lots of Jap bikes of a similar age are not painted, like the Yamahas and have no problem. I guess it all comes down to the quality of the casting and the material 

Cheers
CR21

[captaink]

Well just a bit to add really, I have been busy with my Rickman build and have now built its engine as well as the engine for the CR750.
I have been patiently waiting for the tank to be made for the Rickman by Holtworks and have been assured it will be very soon ( 36 weeks now ). I'll die of old age before I get it me thinks.
The colour has been decided for the CR and that will all be painted soon, seat fairing and tank. Yet to source the front mudguard though

HOUSE OF COLOUR TEST PANEL PICTURES

[CR21]

Well just a bit to add really, I have been busy with my Rickman build and have now built its engine as well as the engine for the CR750.
I have been patiently waiting for the tank to be made by Holtworks and have been assured it will be very soon ( 36 weeks now ). I'll die of old age before I get it me thinks.
The colour has been decided so when the tank arrives it will all be painted, seat fairing and tank. Yet to source the front mudguard though

Great news! What information do you have on the colour?

Cheers
CR21

[captaink]

I only picked the panel up today but its candy red 2 parts, candy tangerine 1 part over a matt silver base.
ill have more details later but with the white and black it will look stunning.
My painter is top dog , he's old school
Having been the painter for the original batman movie car, Gerry Andersons thunderbirds, seats on big brother, Red Bulls F1 concept car at Goodwood etc etc.
Not cheap though

[captaink]

Was trying to post a picture or two but having a glitch on the computer.

[Nurse Julie]

That colour is stunning.

[philward]

My research comes up with The Honda paint code as Candy Topaz Orange is: YR-1 C
Few sources
https://www.colorrite.com/product/honda-yr1c-candy-topaz-orange-3819.cfm

https://www.twowheelparts.nl/en/paint/colorpaint/honda/

Paint code was provided by Simon Tappin (Moonpie)

Tony Huck from Maitland racing advises that there is a Vauxhall colour that is near identical - look on the Maitland Racing website where there's a CR he's currently builing

Just a bit of info, not suggesting they are right but may be of help
Phil

[philward]

Here it is on a ST70

http://www.st70.net/forum/viewtopic.php?t=1163