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CB750 / Re: Final drive shaft
« on: March 21, 2021, 06:19:52 PM »
Because of the bigger bearing the engine sprocket is further away from the engine case by about 5mm, so chain alignment needs checking.
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CB750 / Re: Final drive shaft« on: March 21, 2021, 06:19:52 PM »
Because of the bigger bearing the engine sprocket is further away from the engine case by about 5mm, so chain alignment needs checking.
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CB750 / Re: PD Carb Serial numbers« on: December 17, 2020, 03:28:13 PM »
Thanks for this. I'm aware of the different A's and B's between the 41's and 42's. When looking down the throttle slide opening there is a definite difference in the machining with a wider flange either side at the bottom on those used on K7/8. It was just these last 3 digits that I was wondering about. My own thought is it might relate to some production related thing such as date or location of manufacture/assembly.
Have to say I don't have any issues with them, at the end of the day they are just a carb. 3
CB750 / PD Carb Serial numbers« on: December 16, 2020, 08:51:02 PM »
I know people hate them .... however, PD Carb serial numbers usually start PD41 or 42 then either AA or BB, followed by two other letters and lastly a symbol which looks Japanese. Can anyone explain what these last 2 letters and symbol relate to. Also anyone know if as long as they all start the same, eg PD41BB, is there any issue with these last 3 digits not matching to make up a set. (I'm getting one of my headaches coming on again)
Neil G 4
CB750 / Re: centre stand« on: December 16, 2020, 08:37:46 PM »
I think, (emphasis on THINK cos I don't have one to compare), that the 77 (K7) has a different curve on the tang so as to go around the exhaust which is lower on the K7. Try looking on Google images.
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CB750 / Re: unusual modded engine SOHC?« on: December 10, 2018, 05:18:31 PM »Yes Dave, the RCB was built on CB750 bottom end but had bespoke barrels and twin cam head that made the first iteration 16valve endurance racer.I seem to recall a magazine article with the cases split and I'm sure it was a gear primary drive. anyone know for sure? 6
CB750 / Re: 1st One of these I've ever seen!« on: December 07, 2018, 10:33:00 AM »Even the genuine Soper bike didn't sell at £8000Often wondered why nobody re-framed the cb750 in the 70's (for racing) - surely they would have been faster than the Nortons and Triumph Triples of the time. Think I'm right in saying that Honda always did well at the start of racing at Daytona at that time, but the cam chains and tensioners failed leaving BSA/Triumph to go on and win. 7
CB750 / Re: One for the Engine Tunners to ponder« on: November 04, 2018, 04:35:35 PM »
Mmmmm now you see why my head hurts 😢
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CB750 / One for the Engine Tunners to ponder« on: November 03, 2018, 05:31:15 PM »
In a moment of madness I have created a monster using an F2 motor with a K7 exhaust. So I ask myself, where should I start with the carbs. Should I start with F2 jetting due to the combustion chamber design. Or K7 due to the 4 into 4 exhaust design. I have to use PD carbs to keep in with the theme of the build so swapping for earlier types is not an option.
I need to rest now cos my headaches are starting again 🤔 Neilg 9
CB750 / Re: What's the long and short of this one.« on: August 22, 2018, 12:16:58 AM »
Actually I think I've sorted it. A closer look reveals the short end has a face that is flat whilst the long end has a rounded end. So it's short end into the head so the flat can bottom out.
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CB750 / What's the long and short of this one.« on: August 20, 2018, 08:50:43 PM »
I have a set of new exhaust studs to fit to my F2 motor. One end has a longer threaded section than the other. Can any one tell me which way round they are fitted.
ta Neil G 11
CB750 / Re: Front Hubs?« on: June 08, 2018, 01:24:37 PM »
Check the part numbers on CMS www.cmsnl.com/honda-cb-four_model7148/
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CB750 / Re: top tube frame mod« on: March 20, 2018, 02:23:34 PM »
http://www.cyclexchange.net/frame__end.htm
Good Ol CycleX 13
CB750 / Re: Painting over Pwder Coating« on: February 26, 2018, 12:55:22 PM »I have to say I've had the exact opposite. I first used powder coating nearly 30 years ago. I still Have that bike and it still looks good after nearly 80,000 miles. It still shines and only a few wear marks. I have always used TripleS at Bingley except for one job after I moved from West Yorks, I thought I would try a local coater on a Harley belt guard. I asked for A deep shine black and got a grey orange peel. Lesson learnt and I have since done the journey back to Bingley for my coating. It seems quite clear you get what you pay for. 14
CB750 / Re: Four into Two Exhaust system« on: February 24, 2018, 11:30:23 AM »
Try CycleX but they'll cost you especially with import tax
http://www.cyclexchange.net/Exhaust%204%20into%202%20Page.htm 15
CB750 / Re: Painting over Pwder Coating« on: February 20, 2018, 12:16:16 PM »
I talked to the guy who does my painting some time ago on this subject. He is a professional custom painter and knows his stuff. He informed me that it was fine to paint over powder coating but the item needed to be warmed in an oven to a low temperature first to get the paint to key. However this was some time ago and I'm not sure if that is relevant to water based paints we use now. On another note proper powder coating is not just ordinary paint. It's a lot tougher and takes harder knocks. If yours doesn't then you're using the wrong guy.
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