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Messages - royhall
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61
« on: January 16, 2024, 08:46:30 AM »
Morning Ash. Blimey you have a good memory. I must have got the screws from somewhere else not knowing at the time that they wouldn't work. This is definitely the first investigation into what's happening. I will still have the old parts in the lockup, question is where. If all else fails Silvers do a kit for the 500 for £20.
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62
« on: January 15, 2024, 02:43:29 PM »
I may have discovered something in the photo's. These are some of the new parts that I got from Ash. They are mixture screws for a 450 that don't fit correctly in 500 carbs. I have a horrible feeling they were fitted at the carb refurb. Could be the smoking gun. That would be nice as they are easy to change. It would also explain why moving the mixture screws appears to make no difference.
Long search in a cold damp lockup coming my way. The old 500T carb parts are in there somewhere. If I can find them I can take one out of the bike to compare.
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63
« on: January 15, 2024, 02:28:00 PM »
Thanks for posting them Julie, your a star as always.
64
« on: January 15, 2024, 02:27:20 PM »
Thanks for that Ash. My carbs were done by Matt Harper who cannot now remember what he did. At the time he said he deactivated the valves whatever that means. I had some new genuine 450 carb parts from you that he fitted but don't know if he changed the mixture screws for 450 type. According to the site you sent me the 450 screws don't fit correctly. I don't suppose you can remember what parts you sent me Ash, I know it's years ago. I cant recall what parts there were at all. I may be best just looking for some decent 450 carbs and rebuild those. Do the 500 carbs have springs on the diaphragms, I seem to remember you sending me a pair of those. Before I go any further I think I will have a scan through the photos, it may help.
65
« on: January 14, 2024, 10:07:31 PM »
You are correct. Unfortunately I have tried float heights both ways, it makes no difference to the running. Possibly a problem using 500 carbs on a 450, although it has genuine 450 needles and jets.
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66
« on: January 14, 2024, 06:04:53 PM »
You may be correct there. Problem is that over the 2 years since it was finished I have tried all sorts to lean it out a bit. Any changes just make it run badly. I get the impression from the internet that these CV's are just rubbish carbs. They were probably okay new but 50 years of wear hasn't helped.
67
« on: January 14, 2024, 05:54:59 PM »
There's not too much available for these carbs by way of jets and needles. The float heights are a bit lower at 19mm already. They should be 20mm as stock. Looking through Google this appears to be a very common issue, to the point that several companies sell a complete Mikuni conversion kit. These kits come with everything required but at an outlay of about £460.
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68
« on: January 14, 2024, 05:44:36 PM »
Just a little update. The Bomber hasn't seen much use since it was completed. This is mainly due to it running rich and fouling the plugs with sooty black deposits. Strangely though it runs very well. Just changed the oil as it's been in a while and it smells badly of petrol and poured out like water. Probably unburnt fuel washing the bores and getting past the rings. As you may know from earlier in the thread I am running 500T carbs with 450 jets and needles. These carbs don't have adjustable needle positions or I would have dropped the needles a notch or two. Not sure what to do here, maybe a Mikuni conversion kit, anyone know anything about that. Obviously I can't use it with oil contamination like that. Don't seem to be having much luck with carbs lately.
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69
« on: January 13, 2024, 07:12:50 PM »
Thanks Julie. Will get back to you when I hear from Matt.
70
« on: January 13, 2024, 06:27:15 PM »
That's great Julie. Cheers.
71
« on: January 13, 2024, 06:16:14 PM »
Hi. I still haven't managed to get the CB750K5 on the road yet due to carb issues. The carbs were rebuilt by Gerben in Holland and he has made a very poor job of it. They look great on the outside but the actual workings, not so much. I sent the carbs to Matt Harper in Cheshire who has found a long list of issues. The latest he has found is mismatched lever choke lever arms with carb 1 arm being 5mm shorter than the other three. He thinks that No.1 is the correct length and the other three are off K0 carbs. This mismatch causes the choke pushrod to foul on the cable quadrant and does not operate carb 1 choke correctly.
My question is. Does anyone have a spare 4 piece set of choke lever arms for a later model 750. I hope the pictures show what I'm looking for better than words.
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If anyone can help out with this I would be most grateful. Also take as a warning that Gerben ain't so hot on carbs, in fact he should pack it in. I have a list of faults that Matt has found that's makes me wonder how the bike even started in the first place. Thanks for the help.
72
« on: January 04, 2024, 04:47:14 PM »
Blimey!! Really sorry to hear that Phil, what an absolute bummer. Wishing the very best for you and your family.
73
« on: December 28, 2023, 08:10:02 PM »
Black on old Honda's is switched live.
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74
« on: December 28, 2023, 01:15:47 PM »
I would have preferred a warm welcome on this thread. Not a lesson on past Politics and Drama!
I stay off other Social Media sites for this very reason. hoping this is not what this site is about, I just want to have fun with my bikes and have some fellow camaraderie.
Hi and welcome to the forum. Don't take any of that as the norm on here, our moderator will not allow political views or bullying etc. This is a very friendly and helpful place to be. Good luck with the bikes.
75
« on: December 25, 2023, 02:01:34 PM »
Can I also add my seasons greetings. Hope you all have a lovely Christmas. Vegetable engineering, love it. 
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