CB 750 riding question.

[Cabreco]

At what maximum speed can you "COMFORTABLY" ride on the highway?

Odd  question but here's why I ask.
When I ride Fiona over 55mph, it is a white knuckle experience. It's not that she drifts or shakes it just "FEELS" like she's gonna fly apart. I don't recall this feeling riding my CB500 25 years ago. At 1st I thought "maybe I've lost my nerve" but that's not the case as I have also have a full dress 1200 cc Yamaha which I comfortably ride on the highway at over 80mph.

Is it possible that this could be caused by the IRC tires?

Just trying to figure this out.

[FastCletus]

whats an irc?  Check to see that wheel weights have fallen off.  Check forks and rear suspension.  check tire pressure.  Get tires balanced

then go from there

[Cabreco]

FastCletus wrote

whats an irc?  Check to see that wheel weights have fallen off.  Check forks and rear suspension.  check tire pressure.  Get tires balanced

then go from there

IRC MOTORCYCLE TIRES.

Tires are balanced, forks & shocks good, Tires always at proper pressure.
The feeling I get is like riding a CB175 over 60mph. It's not like it's because I'm used to riding a big bike, since going over 55mph on the 750 has always felt like I'm exceeding the bikes capabilities

[shinyribs]

You reckon maybe it's the high revs messing with your mind? I know you got that other big highway cruiser. I imagine the engine on that thing turns pretty slow compared to these bikes.

You might just be spoiled!

My bike is geared with 18-48 teeth on a 530 chain. Been awhile since I've had a tach,but IIRC, 70 mph was about 6k rpm for me. I typically cruise the interstate at 75 mph. Bike is completely stable. I can turn loose of the bars at 75 mph with confidence. Anything past 80 mph feels like I'm pushing the bike. not chassis wise,just obvious that I'm not geared for sustained cruising at those speeds. I've held over 100 for 2-3 miles before and the chassis was comfortable. I could watch the oil temp climb,though.

One thing I have noticed lately is bar end mirror vibration,foot peg vibration and hand grip vibration is becoming noticeable on mine. I never used to have any of that before! Everything on the bike is like it should be,but I'm about 13,000+ miles since my last carb sync. Wondering if that could be it?

[Rodgil]

My 82 CB750F is steady and smooth at 90mph+. I did change the rear sprocket to 40 tooth (front is 18), so it is like adding another gear. Once I found starting off in 2nd gear was easy, I knew raising the gearing would not be a problem.

[free2ride]

70 mph [120 kmh] @ 5500 RPM is a nice smooth ride [I'm trying to hold at 65 but I keep sliding up to what I have discovered is a comfortable 5500 RPM]. Not bad at 75 but I'm not in that much of a rush to shave a couple of minutes off my ride . . . in fact I'm looking forward to slowing down once I get back on the road tomorrow.

[icerigger]

The Behemoth just seems to want to run in the 70 - 80 mph range. It's smooth and solid.

But if I've been riding it a lot and want to go out on the Rebel for an afternoon, it takes a bit for me to lose the feeling that it's going to fall apart under me, that it's not all there, especially at highway speeds.

Maybe you've got the same thing, going from the 1200 to the 750?

[Cabreco]

Yeah, I'm going to have to pay attention to the RPMs at 70.
I could be misinterpreting the screaming RPMs as pushing the limits. There's no way I could EVER take here on a long distance run...Spoiled, yeah I definitly am, I cruise at 80 at around 3500 rpm,  but I remember feeling this on the 750 even before I bought the 1200.