Winter Work

[hondatri]

 Deglazed barrels  using borrowed Rotary deglazing tool. Lapped in valves found a broken outer spring on No.1 Exhaust also when I pulled off the Barrels top ring on No 4 Broken( May  be my Fault) Bike had been running very rich as all pistons were black carbon I still need to know for sure if pistons are standard as there are no marking on crown. I still dont know if I should split engine to change Cam Chain horse shoe I can rock it with 2 screwdrivers 1 on adjuster and 1 pushing down on horseshoe at rear of engine it moves but not very freely as some resistance felt.

[Bryanj]

Pistons were not always sized, look at the ends of the rings closest to the gap for any markings

[Lynx]

Can you get hold of a Vernier Caliper to measure one?

[Bitsa (Ralph Wright - RIP)]

Go with Bryan here,If they are standard normally a N mark if oversize marked 0.25 etc to 1.00.You may need to use a magnifing glass depending on how good your eyes are.
Cheers
Bitsa

[hondatri]

 I have a jewelers eye glass  I  looked at a couple of rings no marks Whatsoever the piston dia is 50.80 MM. hope this info can help.

[Nurse Julie]

Can you get hold of a Vernier Caliper to measure one?

Bitsa used to have a Vernier, his last relevant post said that if he ever found it, he would nail it to the floor. Did you ever findi it Bitsa?

[Bitsa (Ralph Wright - RIP)]

Julie
No I bloody well havent.Looks like I will have to buy another one damn shame it was a good un.It probably is now in the local tip in a box of rubbish
Cheers
Ralph

[ka-ja]

Hi,
    Standard bore is 51mm, best to measure that, but with a piston at 50.8mm, it looks like standard sizes.

[hondatri]

I brought Piston and Rib=ngs to my Friendly Motorcycle Guru Who confirmed it as Standard he said no marks standard only marked when oversize, Order has now been sent off (Christmas fund empty) Does anyone know where I can get a Standard Camchain screw The previous owner just put in an ordinary 6mm bolt with no lock nut.. Thanks Guys for all the help and info as a guy once said   I WILL BE BACK. I will keep forum posted on progress

[ka-ja]

Hi,
    If you are not too bothered about originality try

http://www.ebay.co.uk/itm/HONDA-CB400-FOUR-STAINLESS-STEEL-CAM-CHAIN-ADJUSTMENT-BOLT-LOCKNUT-/281486100722?pt=UK_Motorcycle_Parts_13&hash=item4189e108f2

[Bitsa (Ralph Wright - RIP)]

Ka Ja
If thats the bit he is after I go along with that looks good.
Cheers
Bitsa

[ka-ja]

Hi Bitsa,
            I presumed that's the one, it is the only cam bolt I can think of with a locknut
                                                                             cheers---ken

[Bitsa (Ralph Wright - RIP)]

Yeah me too mate but been wrong b4
Cheers
Bitsa

[Trigger]

Bitsa, wrong before and saying that repro parts are OK. All in one week. What is the world coming too.

[Bitsa (Ralph Wright - RIP)]

Trig
Some you win some you lose but some thimes you have to use whatever you can
Cheers
Bitsa