Great that you've put up this video! Looking forward to myself saving money to purchase a CB750 and restore/improve where it lacks. Maybe 10,000 euros on the side is enough to get a bike like this on perfect condition.
I feel you bro but if you want everything to work right you have to stick with OEM parts. As far as only hitting on three I’d have brought it back asap and shut it down. Yes those early carbs can be a bitch. I rebuilt my KO carbs several times before I replaced them. Even a cold start is a no choke light switch. Sometimes you just gotta bite the bullet. Loved the video.👍👊🏻
Talking about things I hate on these bikes, the most important for me was a weight especially because it was kept high, undeveloped spindly frame and forks and very wimpy suspension and brakes. Not comparing it to a modern stuff, but to British and Italian competition from "back in a day" where T120 / Tr6 with a good rider could leave you for dead after a couple of turns on a winding road. The things I like is rider position and reliability. Certainly today restoring carbs can be quite difficult task. Talking about your bike its much too lean on those individual filters, try to get a proper air box with factory filter for it.
I agree, I think the CB750 makes a horrible chopper. The lines are all wrong. A Harley or an old Triumph makes for an ok chopper. If I had to complain about my 1975 CB750, which is I love, here's a few things I wouldn't mind improving. 1,) Stiffest throttle I've ever felt. It's a work out on the right wrist and forearm. (One of the lightest clutch levers though.) 2.) It's a bit heavy for what it is. Mine fell over once in my garage and it was a bitch to pick up. The weight is felt on slow speed maneuvers and when pushing the bike around. Once you're moving at a certain MPH it feels nice and planted. 3.) It's a bit underwhelming off the line. As you ride around town it fools you into thinking it's got some juice, but when you really get on the throttle you realize it doesn't. At least not mine. 4.) I don't like that you can't take the top end apart without removing the engine from the frame.
Most of your points could be fixed by putting in 28 mm flat sliding Mikuni carbs with acceleration pumps: The spring is much softer, so no issue with your right hand anymore even on longer trips. Then the acceleration pump, which comes with the new carbs: it really makes you feel as if you have 20 more horses when you pull the throttle. The end power is about the same, but the entire engine instantly responds. I did it on my bike here and it is really great. The acceleration pump uses you turning the throttle to actively inject gas directly between the motor and the carburator. You can adjust the amount of gas, if you like. The effect is enormous, because due to this mechanism the engine gets full power in the very second you open the flat slide, as the gas doesn‘t have to react on the lowered pressure and then climbing up the nozzle before you feel anything. Works with the same airbox, although I would recommend K&N single filters. Search e.g. for www.mikuni-topham.de, they also provide support in english. Of course this is also not really cheap, but for me it was definitely worth it.
@@navscycles enjoy your videos . These cb750's really any vintage bike has to be approached on its own terms of course ; ) Not fair to hop off a gixxer thou (k5 my favorite) and then dwell on the front end bias of these . And I appreciate efi as much as anyone , but theres a "je ne sais quoi" when the bike requires more of YOU to interact with it regarding its mechanical idiosyncrasies. Those Keihin carbs demand you cultivate an ongoing relationship with them to keep you both happy ! Lol like all relationships it's an oppurtunity to take a zen and magnanimous approach to something that can be more than willing and capable to bewilder and frustrate you. But again when you're both happy there's no deeper satisfaction ! So we CAN ......learn to love our carbs ! Ask me how I know lol 😀
Great that you've put up this video! Looking forward to myself saving money to purchase a CB750 and restore/improve where it lacks. Maybe 10,000 euros on the side is enough to get a bike like this on perfect condition.
I feel you bro but if you want everything to work right you have to stick with OEM parts. As far as only hitting on three I’d have brought it back asap and shut it down. Yes those early carbs can be a bitch. I rebuilt my KO carbs several times before I replaced them. Even a cold start is a no choke light switch. Sometimes you just gotta bite the bullet. Loved the video.👍👊🏻
Talking about things I hate on these bikes, the most important for me was a weight especially because it was kept high, undeveloped spindly frame and forks and very wimpy suspension and brakes. Not comparing it to a modern stuff, but to British and Italian competition from "back in a day" where T120 / Tr6 with a good rider could leave you for dead after a couple of turns on a winding road. The things I like is rider position and reliability. Certainly today restoring carbs can be quite difficult task. Talking about your bike its much too lean on those individual filters, try to get a proper air box with factory filter for it.
I have a factory air box just waiting for a stock exhaust and returning it to factory. I bought it like that.
I agree, I think the CB750 makes a horrible chopper. The lines are all wrong. A Harley or an old Triumph makes for an ok chopper.
If I had to complain about my 1975 CB750, which is I love, here's a few things I wouldn't mind improving.
1,) Stiffest throttle I've ever felt. It's a work out on the right wrist and forearm. (One of the lightest clutch levers though.)
2.) It's a bit heavy for what it is. Mine fell over once in my garage and it was a bitch to pick up. The weight is felt on slow speed maneuvers and when pushing the bike around. Once you're moving at a certain MPH it feels nice and planted.
3.) It's a bit underwhelming off the line. As you ride around town it fools you into thinking it's got some juice, but when you really get on the throttle you realize it doesn't. At least not mine.
4.) I don't like that you can't take the top end apart without removing the engine from the frame.
The throttle on my Supersport is unbearable but my k is ok. You can change the spring if jt really comes to it.
The other things I can definitely see
Most of your points could be fixed by putting in 28 mm flat sliding Mikuni carbs with acceleration pumps:
The spring is much softer, so no issue with your right hand anymore even on longer trips.
Then the acceleration pump, which comes with the new carbs: it really makes you feel as if you have 20 more horses when you pull the throttle. The end power is about the same, but the entire engine instantly responds. I did it on my bike here and it is really great.
The acceleration pump uses you turning the throttle to actively inject gas directly between the motor and the carburator. You can adjust the amount of gas, if you like. The effect is enormous, because due to this mechanism the engine gets full power in the very second you open the flat slide, as the gas doesn‘t have to react on the lowered pressure and then climbing up the nozzle before you feel anything.
Works with the same airbox, although I would recommend K&N single filters.
Search e.g. for www.mikuni-topham.de, they also provide support in english.
Of course this is also not really cheap, but for me it was definitely worth it.
@@navscycles enjoy your videos .
These cb750's really any vintage bike has to be approached on its own terms of course ; )
Not fair to hop off a gixxer thou (k5 my favorite) and then dwell on the front end bias of these . And I appreciate efi as much as anyone , but theres a "je ne sais quoi" when the bike requires more of YOU to interact with it regarding its mechanical idiosyncrasies. Those Keihin carbs demand you cultivate an ongoing relationship with them to keep you both happy ! Lol like all relationships it's an oppurtunity to take a zen and magnanimous approach to something that can be more than willing and capable to bewilder and frustrate you. But again when you're both happy there's no deeper satisfaction !
So we CAN ......learn to love our carbs !
Ask me how I know lol 😀
When do you plan to put an original exhaust on the bike?
Hopefully this winter. I wan to do a service on jt and get new exhausts at the same time