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67` Bomber running problems
Bryanj:
OK , bit of an epistle here
I have never laid hands on a bomber, even at my advanced years before my time and not that common.
From your description i have a feeling the early 500 four used a similar mechanism and detent which was modified very early on due to 2nd gear problems, perhaps ( and this is a BIG jump) the later 500 change mechanism as shown in Teds picture could be adapted to fit the 450 without too much work, i do not know what would need to be done or even if its at all possible and may need a "hybrid" gear change shaft made from a 500 and a 450 combined.
If you look in Ash's dropbox or cave for all the bulletins there is one on there that shows you the modification "kit"
I have never done the bottom of a 500 either so dont know if those would fit either, a long and involved study of parts lists from cms may help but sorry i dont have the time at the present to do that for you.
There ought to be a lot of 500 twins hiding somewhere as they did sell but not in big quatities.
mo goldie:
Are thanks everyone That's a bit to take in after all that I have done Thought I could just go out and ride Now Ha..... lol
I have looked on the D/S site ....... and they do have most like the Coller drum 24446-200-000 and the No 2 spring 24641-216-000 that they will have to order in....they have got No 12 spring No 24435-283-010 I have the No 3 spring already as that 24651-283-000.
If I unscrew that Detent 8-9 it wont drop anything inside will it Ash ? but I will take that out first to see if that is Ok and go from there.
AshimotoK0:
--- Quote from: mo goldie on April 03, 2024, 07:19:28 PM ---Are thanks everyone That's a bit to take in after all that I have done Thought I could just go out and ride Now Ha..... lol
I have looked on the D/S site ....... and they do have most like the Coller drum 24446-200-000 and the No 2 spring 24641-216-000 that they will have to order in....they have got No 12 spring No 24435-283-010 I have the No 3 spring already as that 24651-283-000.
If I unscrew that Detent 8-9 it wont drop anything inside will it Ash ? but I will take that out first to see if that is Ok and go from there.
--- End quote ---
Pretty sure you can take 8-9 out Mo without it going inside but you may need a small magnet on the end of a rod to coax it out. Don't attempt to move the shift drum though with the gear lever. Before you do it I have some spare crankcases in my shed so I will look more closely at it. You may have to rock the drum a very small fraction either way to get the the 'collar shift drum guide' Item#9 to release.
Also check arm #11 moves freely and has decent spring pressure from spring #12. Also that the screw #19 which holds the guide plate to the shift drum isn't loose.
I am pretty sure a 5-speed arrangement will not fit the Bomber K0 ... the bottom end of the 4-speed is totally different to the 5 speed .. the crank for instance bears no real resemblance to the 5-speed. I am told the 4-sp is more like a Honda race crank arrangement.
mo goldie:
Great Thanks Ash for that.
I will have a look at it tomorrow and I have a small headed Magnet if needs to be to get down the bolt Hole, as I say I have the No 12 spring but will look at the 8-9 first before I go any were else...... as i have already last week took the casing off as I said before I put a new Clutch in with new springs which were EBC ones which they said were 15% stronger....... that when I got my cases back from spraying and fitted them in with the clutch new clutch plates and it so heavy, so last week as I say took the case back off and fitted the old springs and it is fine now...... just wish I had known More about the 2nd gear Problem while I had that to bits I could have checked that all out while that was off ha :(
Cheers Mo
AshimotoK0:
Here goes Mo. The hex head on the bit in the top crankcase was pretty tight but removed it and pictured parts in the images below. Also tried to photo inside the hole and you can see the channel groove in the shift drum directly below so pretty sure nothing can drop inside when you remove the 'bolt' thingy.
Cursing as the case wasn't on the shelf where I thought it was ... I had stored it away in the bowels of my shed. :)
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