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1971 CB500K0 Resto 3/71 VIN 1000896
Bryanj:
Looking at those bits, especially the tensioner that engine has done sod all miles mate, you said one bore had a ridge silly question but was it wear or just a carbon ridge?
AshimotoK0:
--- Quote from: Bryanj on February 20, 2016, 04:27:32 PM ---Looking at those bits, especially the tensioner that engine has done sod all miles mate, you said one bore had a ridge silly question but was it wear or just a carbon ridge?
--- End quote ---
No its definitely a proper ridge mate but the pistons look OK. BTW loads of people on here have been bloody marvelous giving me sound advice but I must say you have been an absolute diamond to me Bryan.
A guy in Germany is breaking a couple of 500's and is looking to see if the barrels are OK on any of them.
I just love the design of that 500 engine plus seeing some old friends from my CB250's in there like the shift drum (have a NOS one of them to put in it if needed). Took my trusty home made ,in 1980, peg spanner in to work today ...... as used on CB750,CB175,CB250 etc but not needed on the 500 after all that. Used a CB250 brake lever spindle/bolt to extract the primary chain shaft whatever its called.
JamesH:
Looking good ash. Happy days.
Bryanj:
I have several sets of cylinders but condition unknown mate
AshimotoK0:
Everything looking OK APART from the cage of the 20mm needle roller which is toast and the needles are slightly scuffed. It's the same part as CB250/K a ---286--- part No. Luckily I have a spare 250K4 gearbox with decent 20mm bearing in it and the 500 shaft surface finish looks fine.. The bearing is branded Koyo on the 250 and different design of needle cage. It's unbranded on the 500K0 .The bottom end has never been apart before on the 500. Is this a known issue with the 500K0 gearbox?
Unfortunately the mega cheap GENUINE Honda 400/4 20mm needle roller bearing from Yamiya is open construction but possibly the rollers and cage could be swapped. Literally loads of CB250/350/CL350 gearboxes out there though. centre gear selector and selector shaft both the same as the CB twins too.
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