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Old 03-26-2013, 10:48 PM   #631
boxerboy81
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I had a 65LS when they were new. It had an inherent buzz from around 105-120 kph. It was a matter of "they all do that". A mates R65 also had the same issue.

I did meet a bloke that told me his vibes were cured with free flowing mufflers (read noisy) but I never did ride it to find out for myself.
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Old 03-26-2013, 10:57 PM   #632
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Originally Posted by boxerboy81 View Post
I had a 65LS when they were new. It had an inherent buzz from around 105-120 kph. It was a matter of "they all do that". A mates R65 also had the same issue.

I did meet a bloke that told me his vibes were cured with free flowing mufflers (read noisy) but I never did ride it to find out for myself.
I believe my LS had 3.57:1 gearing but I never cruised around that slow. I made very free flowing mufflers for mine and it didn't change the way it vibrated at all. Tightening the engine mounts might? Making custom engine spacers so that torquing the engine mounts doesn't stress the frame (bow the frame in) might help. My dad fixed more than a couple of brand new beemers doing that.
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Old 03-26-2013, 11:32 PM   #633
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I believe my LS had 3.57:1 gearing but I never cruised around that slow. I made very free flowing mufflers for mine and it didn't change the way it vibrated at all. Tightening the engine mounts might? Making custom engine spacers so that torquing the engine mounts doesn't stress the frame (bow the frame in) might help. My dad fixed more than a couple of brand new beemers doing that.
No memory of the gearing mine had.
No surprise the free flowing mufflers don't really work to reduce vibes. Too much bullshit around to believe everything one hears or reads.
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Old 03-27-2013, 06:58 AM   #634
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I apologize for not being clear enough, the buzzy I mean is that the engine RPMs seem too high. At 65mph I am at 4500RPM(ish).
It feels so unnatural to me to cruise around at 4800rpm at 70mph, the exhaust is free flowing and it is loud. The bike is actually pretty well synced and doesn't seem to vibrate much. I just feel that the engine is working too hard for basic crusiing speed and when I want to pass someone at 70-80 it is like it's going to blow at 5000RPM +.
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Old 03-27-2013, 07:08 AM   #635
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I apologize for not being clear enough, the buzzy I mean is that the engine RPMs seem too high. At 65mph I am at 4500RPM(ish).
It feels so unnatural to me to cruise around at 4800rpm at 70mph, the exhaust is free flowing and it is loud. The bike is actually pretty well synced and doesn't seem to vibrate much. I just feel that the engine is working too hard for basic crusiing speed and when I want to pass someone at 70-80 it is like it's going to blow at 5000RPM +.
Wanna put an R100RS back end on it? Everything you need, drive, wheel, axle, brake disk, all brake parts, tire...reasonable but not cheap.
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Old 03-27-2013, 07:44 AM   #636
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Wanna put an R100RS back end on it? Everything you need, drive, wheel, axle, brake disk, all brake parts, tire...reasonable but not cheap.
I think I may have decided on a 34/11 from an R90. It should give me a much better range and hopefully not take all the guts out of the R65. I do realize that it will make a powerless engine less powerful but I am willing to take that hit.

I think yours is probably a 33/11 which is going to be a little too tall for this engine and the 34/11 has drum brakes so easy install.
Thanks anyway.
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Old 03-27-2013, 10:08 AM   #637
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And it will take all the guts out of it. I am afraid you are gearing it so tall your top speed will be 80mph. If you have the time to get up to red line in third gear. I use to cruise mine at 6K ALL the time.
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Old 03-27-2013, 11:00 AM   #638
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Originally Posted by MattySull View Post
I apologize for not being clear enough, the buzzy I mean is that the engine RPMs seem too high. At 65mph I am at 4500RPM(ish).
It feels so unnatural to me to cruise around at 4800rpm at 70mph, the exhaust is free flowing and it is loud. The bike is actually pretty well synced and doesn't seem to vibrate much. I just feel that the engine is working too hard for basic crusiing speed and when I want to pass someone at 70-80 it is like it's going to blow at 5000RPM +.

You might find greater happiness if you just changed the exhaust back to stock. A stock exhaust R65 at 80 mph feels fine.
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Old 03-27-2013, 12:32 PM   #639
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And it will take all the guts out of it. I am afraid you are gearing it so tall your top speed will be 80mph. If you have the time to get up to red line in third gear. I use to cruise mine at 6K ALL the time.

That is OK with me. The bike was a slow poke to begin with, if it is seriously a problem I will put the old rear drive back on.
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Old 03-27-2013, 06:20 PM   #640
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My R65 was happiest around 5500 - 6200 rpm.
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Old 03-27-2013, 06:22 PM   #641
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That R65 engine is meant to spin a little faster. Lug it by overgearing it, and you will miss the point of what that motor has to offer.

It's peppy and revvy - just don't expect it to act like an R100, and everything'll be just fffiiiiinnneeee.
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Old 03-28-2013, 07:06 AM   #642
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@MattySull: Please check your PM's, I have some additional items I can mail to you.
I don't seem to have any PM's. I'd love to hear what you've got!



I am going to stay stubborn here and consider gearing and other options for a nicer highway experience. I seriously just want a cruising gear where 70 is hovering at 4-5k RPM. I know the bike will have no guts at the top of 5th or from a dig but I think I can manage. And if not....I will swap it back in an afternoon.
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Old 03-28-2013, 03:35 PM   #643
Plaka
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I don't seem to have any PM's. I'd love to hear what you've got!



I am going to stay stubborn here and consider gearing and other options for a nicer highway experience. I seriously just want a cruising gear where 70 is hovering at 4-5k RPM. I know the bike will have no guts at the top of 5th or from a dig but I think I can manage. And if not....I will swap it back in an afternoon.
Buy an extra gasket up front, right?
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Old 03-28-2013, 03:52 PM   #644
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I am going to stay stubborn here and consider gearing and other options for a nicer highway experience. I seriously just want a cruising gear where 70 is hovering at 4-5k RPM. I know the bike will have no guts at the top of 5th or from a dig but I think I can manage. And if not....I will swap it back in an afternoon.
It would seem then that you bought the wrong bike. Instead of trying to make the under powered R65 do something it was not designed to do you may consider getting an R100 of sorts.

If you are one of those that have an R65 because of height restrictions this may be more involved than I fancy. But there are things that can be done to the larger bikes.

You may even have the wrong brand of motorcycle. Harley's have a nice low rpm cruising vibe. They in general go much slower than an Airheads I'm around but that's another story. The Harley does fit many riders I think.
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Old 03-28-2013, 05:19 PM   #645
Plaka
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It would seem then that you bought the wrong bike. Instead of trying to make the under powered R65 do something it was not designed to do you may consider getting an R100 of sorts.

If you are one of those that have an R65 because of height restrictions this may be more involved than I fancy. But there are things that can be done to the larger bikes.

You may even have the wrong brand of motorcycle. Harleys have a nice low rpm cruising vibe. They in general go much slower than an Airheads I'm around but that's another story. The Harley does fit many riders I think.
The Harley has a long stroke motor, runs at lower RPM and makes lower frequency vibrations and a deeper exhaust note. The R65, in particular, has a short stroke motor, runs at a higher rpm, has higher frequency vibrations and sounds like a sewing machine.

The shorter cylinders of the R65 helps
cornering clearance.

All airheads have perfect primary balance but a small rocking couple (noticeable at idle) due to the cylinder offset.

This is one of those situations where intuition leads you astray. All Airheads want to be run over 3800 -4000 rpm (charging) and a new rider often isn't used to this. The R65 gets run even higher, more like an inline 4 short stroke sport bike with the top end limited by the valve train.

You get harmonic nodes at particular RPMs. The early K100s had one right where you didn't want it. Unfixable and you got the "they all do that" from the factory. It was a basic flaw in the motor. You can move the node around some with balancing games but it remains somewhere.

I would do all the other anti-vibe stuff before I went to the expense of changing gearing. It all will help, costs little and no matter what one does with gearing, it will be a smoother bike.

Plaka screwed with this post 03-28-2013 at 05:24 PM
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