#78 Main jets

[mr wilkes]

Hi again,

Looking for a UK supplier for some #78 main jets for my carbs. Thought I had sourced some but I can only get #75's from my local supplier.
 
Any help would be really appreciated.

[Trigger]

For what bike ? 78 is a very small jet.

[deltarider]

For what bike ? 78 is a very small jet.

For models with the 649A carbs (instead of 627B) ment for most European markets (France and UK the only exceptions). These models also had an airduct over the airfilterbox instead of the gaze net. In tests they performed equally well as the models that had #100 jets and no cover. Airscrews are supposed to be one turn out ⁺/_- ¹/₈ and needles in 3^rd (middle) position. Why? Answer: we don't know. It's a mystery. Differences in quality of petrol? Some have hinted that Germany had regulations on maximum air intake noise. Below the result that shows my bike (with #78 and cover) was capable to reach its theoretical top speed of 185 km/h on the dyno stand.

[mr wilkes]

CB500 four, My carbs are 649A type which run #78 main jets  "Thanks for the good info Delta" I have looked on 4into1.com but they are out of stock and I would prefer a UK-European supplier if possible.

[Trigger]

It's your lucky day, just found a set from those old boys at CB Classic Motorcycles. [ Guests cannot view attachments ]

[mr wilkes]

Sweet, how do I get my hands on them?

[Trigger]

Sweet, how do I get my hands on them?

Quite simple, you send me a PM with your name and address

[mr wilkes]

PM sent, Cheers .

[deltarider]

Are they Keihins?

[mr wilkes]

They don't have the stamped numbers like the genuine Honda ones so I'm guessing they are either out of a kit or replica ones, either way they will do the job Thanks again Trigger.

Delta, can you help me with identify which model my bike is? I was looking at the service and part manuals that you posted on another post and its thrown some doubt on what model my bike is! I thought it is a K2 but my bike has the ignition key unit  between the clocks, not on the left side of the frame? the clocks are the later larger ones tilted towards the rider, also the petcock is the same as on the cb550.

I wrote to Honda years ago for an age related document and the year of manufacture is 1976.

[Johnwebley]

let us know your engine and frame numbers

  and VIN if it has one

[mr wilkes]

Frame cb5002093456
engine cb500e2180410

European model as imported from Italy.
Year of manufacture 06/12/1976.

will get vin number next time I'm in the garage.

[Trigger]

Frame cb5002093456
engine cb500e2180410

European model as imported from Italy.
Year of manufacture 06/12/1976.

will get vin number next time I'm in the garage.

Frame & VIN are the same thing in theory.

[deltarider]

Mr Wilkes, your bike - by numbers and by year - is definitely a CB500K2-ED. ED means European direct sales. Probably this was 'grey' or parallel import, as we call it. The ignition key unit between the clocks must have been done by a PO. Your model or should I say our model, as I own one myself, share many parts with the CB550K2 that was marketed in 1976 in the US: the tank striping for instance but also the front legs. Our CB500K2-ED is different however from the CB500K2-A that was marketed in 1973 in the US. I bet instead of two greasing nipples on the side, you have one nipple underneath the swing arm and the five stage rear shocks if the originals are still there. Unfortunately neither CMSNL nor DS have documentation on this model. You've probably found the correct Parts List at Honda4Fun. BTW, as far as I know, that site is the only one that has it. Honda4Fun also offers good and detailed info here: scroll down http://www.honda4fun.com/home/faq/generali/111-cb500-differenze-k0-k1-k2  Useful info is also found in this site where you can enter a parts number: http://www.motogrid.com/OEMpartfinder.htm?aribrand=HOM No need to fill in 'Model', just the partsnumber. After you've clicked 'Search' and then 'select model', you'll be presented a list of models, that had that same part. Although it doesn't cover all 'area codes', it can be useful. It helped me quite a few times. And you can always ask me ofcourse. The CB500K2 (ED, F, G) came in three different colors: Excel black (see pic below), Candy sapphire blue and Candy garnet brown.

[mr wilkes]

Thankyou Delta, some very good info there. Your right about the single grease nipple on the swing arm and the five settings on the rear shocks,  I'm still a little stumped with the ignition barrel though, it looks like it's standard fitment as the wiring harness appears to be intact and the key for the ignition also fits the seat lock. I will post a pic once I figure out  how to compress the file.