Rear wheel hop

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Black Out
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Rear wheel hop

Postby Black Out » Tue Nov 14, 2017 7:30 pm

My only criticism of this amazing bike thus far is on hard downshifts and braking going into corners I get significant rear wheel hop whereby the bike is nearly out of control. I learned long ago how to blip the throttle on hard downshifts but the technique doesn't seem to work so well on this particular bike. Anybody else have this issue? Advice?
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No. 47
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Re: Rear wheel hop

Postby No. 47 » Tue Nov 14, 2017 7:40 pm

All one litre v-twins need a slipper clutch, SD/SDR no exception.
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Re: Rear wheel hop

Postby Black Out » Tue Nov 14, 2017 8:04 pm

Yeah, my little 800 Monster would do the same thing until I learned the blip technique. After that it was smooth as glass on the hard downshift. Same with the Speed Triple though not as pronounced.
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Re: Rear wheel hop

Postby wills » Tue Nov 14, 2017 8:35 pm

Your'e shifting and braking should be complete before your leaning over into the turn. The brakes on the 1290 are strong enough to enter the turn at the desired speed, just match the engine speed and shoot out of the turn!

I had the same thing happen when I replaced the 1 litre inline 4 bike with the SDR. A lot of torque braking on these things! :shock:
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Re: Rear wheel hop

Postby Black Out » Tue Nov 14, 2017 9:57 pm

Oh, yeah I didn't mean to suggest I am braking into the corner, just setting up for the corner with a hard downshift.
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Re: Rear wheel hop

Postby michaeln » Tue Nov 14, 2017 10:07 pm

Black Out wrote:significant rear wheel hop


What bike are you riding?

14-16 SD 1290 R models come standard with a slipper clutch and that should handle this issue.
17 SD 1290 R models come with both slipper clutch and goes one step farther with MSR, or Motor Slip Regulation (slightly increases throttle if it thinks the rear wheel is about to rotate slower than the front)

On earlier SDRs I don't know their capabilities.

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Re: Rear wheel hop

Postby BuddhaBiker » Tue Nov 14, 2017 10:08 pm

Have the MSR turned on?


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Re: Rear wheel hop

Postby No. 47 » Tue Nov 14, 2017 10:24 pm

It's not a 1290........................................
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Re: Rear wheel hop

Postby AGRO! » Tue Nov 14, 2017 10:34 pm

I remember when I had my 990 after removing the flies and shafts engine breaking was reduced.

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Re: Rear wheel hop

Postby jmann » Tue Nov 14, 2017 10:52 pm

Comrades: The 1290 is of course much more forgiving than the 990's. Slippers help but ultimately it's just technique.

I'm currently racing a little VFR400 which likes to go into corners at about 8k RPM. It gets a little exciting when I ride the big Kato's and forget which machine i'm on... :oops:

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Re: Rear wheel hop

Postby Black Out » Tue Nov 14, 2017 11:18 pm

Just picked up a 990 last month and getting familiar with it. Honestly I prefer as few rider aids as possible
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Re: Rear wheel hop

Postby Black Out » Wed Nov 15, 2017 4:37 pm

Did it again this morning on the way to work. It's less a rear wheel hop and more like a whole bike shudder. It feels like I'm rolling over little motocross whoops!
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Re: Rear wheel hop

Postby Willh » Wed Nov 15, 2017 6:00 pm

Engine mounts tight?
Lose the flies, let out the clutch slowly.

Could also practice hacking it into corners on the down shifts. Might make you think more about how you are riding.
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Re: Rear wheel hop

Postby gotswap » Wed Nov 15, 2017 6:00 pm

Maybe the chain tension is way out of whack. My 990 would hop a bit but nothing extreme
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Re: Rear wheel hop

Postby Black Out » Wed Nov 15, 2017 6:02 pm

^you might have something there. I think the chain is a bit tight.

What are flies?
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Re: Rear wheel hop

Postby Willh » Thu Nov 16, 2017 12:16 am

Black Out wrote:
What are flies?

Secondary butterflies, search will tell you...
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Re: Rear wheel hop

Postby DribbleDuke » Thu Nov 16, 2017 2:35 am

Black Out wrote:My only criticism of this amazing bike thus far is on hard downshifts and braking going into corners I get significant rear wheel hop whereby the bike is nearly out of control. I learned long ago how to blip the throttle on hard downshifts but the technique doesn't seem to work so well on this particular bike. Anybody else have this issue? Advice?

This is part and parcel of owning this bike. I wonder if the back end is light due to heavy braking with the rear being unweighted . There is a corner that creates this very situation for me no matter how much practicing of techniques i try. it is slightly downhill right with a tight apex that is all running downhill. I have found that keeping it up a gear and ever so subtle rear brake seem to alleviate much of the hopping. Back torque limiting clutches work tremendously on motorcycles, especially big piston twins and thumpers. Technique and practice will keep you from freaking out after a time. I myself have failed at this particular corner entry more times than got it right and when it has been right there was lot less grabbing of brakes and white knuckle bar squeezing going on. try leaving it up a gear first.
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Re: Rear wheel hop

Postby Aphex » Thu Nov 16, 2017 4:42 am

Are you modulating the clutch lever? I started practicing by going 50mph getting hard on the brakes to get the weight off the back end, down shift and modulate the clutch lever. I've found if you don't commit and brake with force there is too much weight on the rear and it skips.
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Re: Rear wheel hop

Postby BuddhaBiker » Thu Nov 16, 2017 5:46 am

I could be wrong, but I thought the rear skips because there isn’t enough weight on it. The times I’ve had the rear momentarily lock and skid sideways is when I let the clutch out too fast in first and didn’t rev match properly.


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Re: Rear wheel hop

Postby Black Out » Thu Nov 16, 2017 3:16 pm

Aphex wrote:Are you modulating the clutch lever? I started practicing by going 50mph getting hard on the brakes to get the weight off the back end, down shift and modulate the clutch lever. I've found if you don't commit and brake with force there is too much weight on the rear and it skips.

I tend to just dump the clutch on hard downshifts and after matching the engine revs to the lower gear (throttle blip). I've done this on all my bikes that's why it seems so weird on this one.
Buddha I think you're right too the rear end on this bike is really light. I should gain some weight in my arse or something.
I did spend some time and loosened up the chain a bit but my commute this morning was tame.
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Re: Rear wheel hop

Postby The Gin Reaper » Thu Nov 16, 2017 7:44 pm

what rear tyre pressure are you running and what tyres? Also what is the average temp where you are at this time of year?
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Re: Rear wheel hop

Postby Black Out » Thu Nov 16, 2017 8:24 pm

I'm a big fan of the Bridgestone S21. I put them on everything. I think I'm running about 33lbs. The weather is pretty temperate all year around. Now it's about 65f out.
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Re: Rear wheel hop

Postby Colonel_Klinck » Thu Nov 16, 2017 8:51 pm

michaeln wrote:
Black Out wrote:significant rear wheel hop


What bike are you riding?

14-16 SD 1290 R models come standard with a slipper clutch and that should handle this issue.
17 SD 1290 R models come with both slipper clutch and goes one step farther with MSR, or Motor Slip Regulation (slightly increases throttle if it thinks the rear wheel is about to rotate slower than the front)

On earlier SDRs I don't know their capabilities.


I'm not a fan of MSR, especially on track. The last thing I want when hard on the brakes is the ECU deciding to add revs. I turn abs off so that turns MSR off. With the auto blipper I haven't managed to get the rear to break away yet. Are you sure suspension is setup properly? If forks are diving to quickly you'll unload the rear to the point if breaks away.
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Re: Rear wheel hop

Postby Black Out » Thu Nov 16, 2017 9:02 pm

suspension feels great. I love everything about this bike, fueling, tranny, handling, all top notch.
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Re: Rear wheel hop

Postby Black Out » Sun Nov 19, 2017 2:10 pm

Rode the bike hard yesterday and had no wheel hop symptoms. I believe the chain tightness was the culprit.
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