CR750 replica build

[Johnwebley]

Bloody hell,that is some machining !!


    keep up the good work

[captaink]

Hi CR21,
Nice work so far,
I'm building my CR replica here in the UK.
Had a bit of a break but I'm back on it now.
I have the Asa Moyce tanks as well, they are nice bits of work...worth the wait.
Do you know what type of fuel tap works with that tank, I have been told its from a Honda motorcross but cant seem to track one down.
Also what are you thinking of doing for a front mudguard / fender.
Regards Keith

[haynes66]

welcome back, captaink! i was wondering how the rickman was coming along.

[philward]

The fuel tap that Meadspead advised me was from a CR250 motocrosser - I got one from an Australian seller (http://www.ebay.co.uk/itm/HONDA-CR250-80-07-GXMOTOR-FUEL-TAP-PETROL-TANK-PETCOCK-/141756762924?hash=item21015c8b2c:g:Yj0AAOSwTapV3XhE). The original is a twin exit tap but you will have to search the .net site for that - don't know if they are available (H2eric on the ,net site got hold of one I seem to remember when reading a thread) - depends how for you want to go.
Its not a priority at the moment for me but the Bartel (Asa Moyce) tanks tap flange bolt holes are not 'blind' and so will need some effective thread sealing to prevent leakage via the thread on the bolts
Phil

[captaink]

The Rickman engine is complete and I plan to put it in the frame in a week or so.

I've done a bit on the CR in the last few weeks
I purchased another 1977 engine and stripped it to the bones, this has now been aqua cleaned and after accessing the work required I'll be sending it up to the engine man for machining.
The present thought is inspect crankshaft and either polish journals or regrind, new shells for the crank and rods.
As before I have got a big bore kit 836cc and it will be rebored to suit.
Head will have new APE valve guides, valves and springs.
APE casing and cylinder studs.
I also purchased another set of casings, cylinder, head and rocker cover to use as a dummy which will allow me to carry on with the project whilst the engine man Dave from D & M Engineering is doing the machine work.
Pictures show the clean but dummy engine.

[Bryanj]

Nobody makes undersize shells so regrind don't work

[Tomb]

Bryan have you Capt'Ks list of bikes? must half a million quid there alone, if you have the money you can get anything done.

I once bored out a Royal Enfield conrod to take different shells, they came from an Austin Allegro that were 10 thou smaller ID to fit an undersize reground crank. It ran for years like that. As you can tell by the Allegro parts it was a looooong time ago.

Nice work Capt'K, no disrespect intended.

[Bryanj]

If you have the time and cash anything is possible but for us mortals it just ain't so, I did convert a pair of triumph white metalled rods from a 500 to shells but the customer didn't like the cost, from memory £25 in the late 70's

[hairygit]

Send it to S.E.P. in Kegworth, they build the crank up with submerged argon arc welding then regrind back to original spec. Can vouch for their quality of work.

[MarkCR750]

Quote
"Bryan have you Capt'Ks list of bikes? must half a million quid there alone"

I don't think the value is anywhere near half a million, I've totted the bikes up and struggled to reach 464,000 😄, on a serious note though I too can vouch for SEP, you don't have to be in a hurry though because they are very very busy!.

(PS capt'K please will you be my friend?).

[captaink]

Hi Mark,
I would be your friend but someone as mad as to "Almost " mask up his kitchen to paint his bike bits is some kind of nutter 
I must admit though I did used to put the high temp painted cylinders for the older bikes in the oven to bake them, it makes the oven smell but does the job. And yes she had gone out shopping.
When I was much younger ( late 1970's ) I spray painted my car in the street, tried not to get overspray on the neighbours cars !  " those were the days "

[MarkCR750]

Fair enough capn'K I can understand that behaviour being off putting, although in some quarters it has almost given me hero status 
PS I'm guessing that a side benefit of spray painting your car in the street was that it simultaneously  marked out your parking bay?.

[CR21]

Hello all!

I have been off the forum for a while, but progress is happening on the build. Clip on bosses are completely machined now as are the rear set pinch bolts and front wheel speedo drive plates.

Captaink - your build looks great please keep updating your thread 

With regards to fueltaps - the CR250 taps that fit the bartel tanks are still available from Honda. I am considering machining my own tap, but at the moment I have bigger things to progress on with the frame!

Update to come soon on the clip on bars/front end. Need to start thinking about designing and machining a splitter for the front brakes lines as well. 

Cheers!
CR21

[CR21]

Just a quick update:

Speedo drive adapter plate machined:





And the filler cap bezel to accept the 'correct' fuelcap:





More to come at the weekend, hopefully front wheel assembly and some movement on the clip-ons!

Cheers,
CR21

[paul G]

Everything about this build is impressive 
P.S. Can you do me some rear sets for a Z650