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Messages - royhall

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31
Project Board / Re: The rebirth of Lazarus
« on: March 03, 2024, 05:06:47 PM »
Like Ted said, I just had a look back to page 1 pictures. Sorry Mick but I'm going to have to get you certified under the Mental Health Act. Jeez that was rough with a capital R. Well done mate.

32
Project Board / Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« on: March 03, 2024, 04:59:55 PM »
The replacement 450 carbs have arrived from Germany and don't look in too bad a condition. They are very dirty but should clean up okay. I will give them a good manual cleaning first with a paint brush and cleaner, then a good soak in the ultrasonic should do the trick. Ash, did you find those replated parts that I could buy off you?

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The new carbs are 14H models originally off a 450K1. After a good bit of checking there are a fairly large number of different 450K carbs all with slightly differing internals (and externals). So I have ordered some service kits from 4into1 in the States that are made specifically for the 14H. Failing that I will have no idea if the parts I'm fitting are correct. I am done with experimenting with these carbs and just want a good standard set. I was a bit worried about the right hand carb as the H next to the 14 has been removed with some sort of gouge. But after much checking of 14H pictures on the internet, I am happy that it is correct. There are also other things that indicate they are off the same bike as both carb vacuum bowls have the same rusty cap head screws. Will see how they come up.

33
Project Board / Re: The rebirth of Lazarus
« on: March 01, 2024, 08:52:47 PM »
Nice one Mick, good luck with the ride.

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CB750 / Re: CB750 K0 UK
« on: February 25, 2024, 09:20:19 AM »
Hi. Good luck with the build. I may be interested in any CB450 bits you have.

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35
Project Board / Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« on: February 19, 2024, 04:04:33 PM »
Thanks Ash that would be awesome.

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36
Project Board / Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« on: February 19, 2024, 07:35:18 AM »
I have got a set of 450 carbs on the way (not sure which model will see when they arrive) so I am going to strip all the new bits back out of the 500 units to reuse. I will order two genuine seal kits from DSS at some point. Also got an ultrasonic bath coming so I can save having to pay people to do them. Cheeky to ask, but are you still doing your own zinc plating as I could do with some small carb bits doing.

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37
Project Board / Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« on: February 18, 2024, 02:08:19 PM »
Just been studying the schematic of the diaphragm housing and my plan to remove and blank the ports wont work. Without the housing the slow running circuit will not flow air. It appears that the housing will have to go back on with the diaphragm in place to hold the spring plate open, but blocking the vacuum tube will keep the system locked in that position. Either that or a much more powerful spring to prevent the diaphragm moving. This is all too complex to be worthwhile so I am on the lookout for a good pair of CB450 carbs. Shouldn't have tried this in the first place really, I would rather the bike was ready for spring than be in the garage with some experimental nonsense going on. Plus running as rich as it has been will eventually trash the engine.

Ash. Putting that aluminium disk in wont work either as the plate valve behind will stay in the over-run position and be horribly over rich all the time. You just need to blank the small port above that disk with a piece of rubber the same diameter as the o-ring, then reassemble the valve as stock with the diaphragm in place. That's job done.

38
Project Board / Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« on: February 16, 2024, 07:32:09 AM »
Thanks Ash. According to that article the removal of the air cut off valves shouldn't make any difference to the rich mixture problem the bikes suffering as it only occurs over 4000 rpm. At least I was understanding it's operation correctly. The removal of the diaphragm housings are done now and I am about to check the float heights are correct then I can reassemble the bike and test what has changed. If nothing has changed, I may end up looking for some decent 450 carbs after all.

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39
Project Board / Re: My 750F2 project.
« on: February 14, 2024, 06:11:05 PM »
That's fair enough, if your pistons are all the same size then the bores will be as well. But it would be a poor job not to check and just trust them. I've had two sets of aftermarket pistons that have been slightly different, they were machined to suit. Never had a difference on genuine though.

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40
Project Board / Re: My 750F2 project.
« on: February 14, 2024, 05:03:07 PM »
0.0025" is way too much for a Honda. At that it would burn oil for fun. Maximum on those is 0.001" and sometimes less than that. Plus they may not all be the same. Pistons should be allocated to a bore then measured for each bore. Fairly likely that the pistons are not all the same size. If you should get a slightly undersize piston on a 0.0025" bore you will hear the slap. As for the barrel effect, from my time as a machinist that is usually too high a feed rate. Rushing.

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41
Project Board / Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« on: February 14, 2024, 02:52:09 PM »
Hi Mo.

Yes they are a 500T carb experiment that so far is not going too well. Hopefully removing the air cut off valves will cure the problem. Just re-looking at the advice that Ash sought on Facebook, and I'm not sure I agree with what was said. They mentioned that the cut off valves introduce extra air on the over-run to stop exhaust popping, that's not my understanding. I'm fairly sure they introduce extra petrol to enrich the mixture past the point of ignition so it cant burn in the exhaust header. Hence my running rich problem, and why I'm removing them. Will find out once the jobs done and the weather allows a run out.

On the other point about the tank. Bombers don't have a cross pipe to level the fuel, they just use the braking and accelerating of the bike to slosh the fuel to the other side. Typical 60's Honda.

42
Project Board / Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« on: February 13, 2024, 04:22:57 PM »
Finally got around to the Bomber carb job. Started by stripping the diaphragm housing off the side of the left hand carb as that one can be done with the carb in place. As the carb man said he had deactivated the unit I was a bit surprised at what was in there. It was a fully functioning valve complete with brand new diaphragm.

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The silver centre part of the casting is actually some sort of valve that the diaphragm rod presses against. After a bit of cogitation I decided to leave the diaphragm housing alone. So instead of trying to randomly block off holes and make a mess, I decided to make an aluminium plate to cover the three ports and just leave the casting off. This has the added benefit of being easily reversed should needs arise. It also makes the carb look a bit more like a 450 item.

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That's the easy side done, the right hand side needs the carb removing to get at it as the diaphragm housing is on the inside between the carbs. That's a job for another day.

43
Member 4 Sales / Re: Selling a Triumph Street Triple RS
« on: February 09, 2024, 05:19:45 PM »
Any takers before it goes on eBay.

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44
Member 4 Sales / Re: Selling a Triumph Street Triple RS
« on: February 02, 2024, 04:07:37 PM »
Just a few more pictures.

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45
Member 4 Sales / Selling a Triumph Street Triple RS
« on: February 02, 2024, 04:02:45 PM »
I'm hoping to sell a Triumph Street Triple 765RS. It is/was owned by my long time pal Jim that I have been going to the Isle of Man with for the last 30 years. Unfortunately Jim lost his battle with cancer in December last year. He had bought the bike last summer as a self reward for getting through all the cancer surgery and chemo. Before he died he asked me to sell his vehicles to help out his widow. I have so far got rid of the car and his Kawasaki ZXR750 with just the Triumph to go. Thought I would offer it to you guys first, you never know.

The bike is a 2018 Triumph Street Triple 765RS. It is in very good condition having covered a mere 5800 miles since new. Starts straight away on the button and does everything expected of it, including the compulsory clutch rattle (they all do that sir).  It has Pirelli Rosso Diablo 2 tyres on it with plenty of tread depth left. This is the one with the twin radial Brembo brakes that without the ABS would throw you over the handlebars. Looking for serious offers around the £6000 mark which is an already excellent price for this fully loaded RS model in great condition. The bike is in Lytham StAnnes, Lancashire. PM me if your interested or want any more information. The bike will shortly be advertised elsewhere.

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