Bike pushing wide on throttle out of left handlers only. - ZX6R Forum
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post #1 of 27 Old 04-18-2015, 02:54 PM Thread Starter
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Bike pushing wide on throttle out of left handlers only.

Hey guys,

I'm struggling with the suspension. Have a full ohlins suspension and my bike is pushing wide when on the throttle and coming out of turns. I am only having this issue on left hand turns. I seem to have had this issue since I dropped the ohlins fork cartridges in.

The turn in feels fine, even mid corner feels fine but as soon as I get on the throttle coming out of a left hander, the bike starts pushing wide which kills my corner exit and straightaway speed especially when it gets so bad I have to lift.

i am working with a suspension tuner but I want to get ideas from you guys that might have experienced similar issues. The bike has responded to some adjustments but I won't discuss to see if you guys recommend the same adjustments he's been doing. Sometimes it's good to get a second opinion.

Left handers are normally my strength, which is why I'd be surprised if it's body positioning but I have changed my body positioning to a less crossed-up style so I hang my upper body off of the bike more. So i guess it is possible that my lefts might not be adjusting to new body positioning.

However, today I went on a slower street ride in some canyons. It was a pretty chill ride and I had my street tires on with normal tire pressures and noticed even in the canyons, that the bike seemed to have a tougher time with lefts then rights. Wasn't even pushing the bike hard today. Was a pretty slow ride and I seemed to notice it.

Appreciate any suggestions on what I can try adjusting on the suspension side and what could possibly be the issue if it's body positioning related.

Thanks guys!!!!

Last edited by RedAndBlack; 04-18-2015 at 02:59 PM.
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post #2 of 27 Old 04-18-2015, 03:34 PM
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Same bike, or different on slow ride?

Any chance you are putting pressure on the right clipon when you open the throttle?

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post #3 of 27 Old 04-18-2015, 03:49 PM Thread Starter
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Originally Posted by Ey3l45h View Post
Same bike, or different on slow ride?

Any chance you are putting pressure on the right clipon when you open the throttle?

Ey3
Same bike, I use it for both street and track.

ill try to be more cognizant of it and see it that's contributing. Appreciate the response. Keep them coming!
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post #4 of 27 Old 04-18-2015, 06:13 PM
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Well besides rider error/input possibilities

the tires are properly aligned?
no bent front axle or forks misaligned?
tire wear---although you said it did it with other tires too

Stupid people say stupid things on the internet, so be wary of who those people are. If you solicit advice on the internet, just keep in mind 99% of what you'll receive is not based on fact or science-and likely atleast 95% of it is based on bullshit and bravado regurgitated from some other schlub who also did not experience any of what they claim and are also full of shit. If you don't like my bluntness- too bad. I am not here to please you, so move along, your approval is not desired nor is it needed. So before opening your pie hole and adding more stupidity, perhaps sit back, listen, absorb and learn something. You know that saying, it is better to remain silent and thought a fool than to open your mouth and remove all doubt!
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post #5 of 27 Old 04-18-2015, 06:55 PM
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Odd that it would only be on one side. The only time I have witnessed handling characteristics being different on one side it turned out to be a bad head bearing. Doubtful that would be the case on a new machine. Has the bike been crashed? Possible frame twist or similar if so. If you are 100% positive that it is ONLY on the left side, read no further. *edit* the more that I think about it, if your frame is bent at the headstock it could cause something like this. If the bike has been crashed, take it to a shop that can laser measure your frame.

Since the problem actually started when you put in the cartridges I am going to assume it is also on the right side but you probably favor lefts and so hit it harder, making it more pronounced.

That being said, a shallow swingarm angle will do exactly what you are claiming (on both sides) and can easily happen when you are messing with geometry. I will have to check my spreadsheet but I believe that I am running 12.5 degrees.

If your suspension tuner knows wtf they are doing, that should be all they need to get you back in the ballpark.

Are you running fork extenders? These bikes like to be run tall on the track and I am just about 5mm below the top of the triple, so I run extenders. I am assuming that you are also running -1/+2 gearing, and added a link to push your wheelbase back as these bikes also like to run a longer wheelbase.

Last edited by PainfullySlo; 04-18-2015 at 07:09 PM.
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post #6 of 27 Old 04-18-2015, 06:57 PM Thread Starter
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Well besides rider error/input possibilities

the tires are properly aligned?
no bent front axle or forks misaligned?
tire wear---although you said it did it with other tires too
thanks for suggestions. I think I exclude all that. Axle is new, happens with different tires, and ive changed the tires about 4 times this year already. I doubt I'm misaligning the tire everytime.
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post #7 of 27 Old 02-04-2017, 05:32 PM
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Bumping because I'm having the same issue on my bike. Goes really wide anytime I accelerate out of a corner. Recently installed penske triple in the back and resprung the front keeping stock fork height and shock length.

Any ideas on how to sort out geometry?

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post #8 of 27 Old 02-04-2017, 06:30 PM
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Bumping because I'm having the same issue on my bike. Goes really wide anytime I accelerate out of a corner. Recently installed penske triple in the back and resprung the front keeping stock fork height and shock length.

Any ideas on how to sort out geometry?
Did you change the spring rates on either shock or forks? The geometry obviously changes dynamically based on braking and accelerating. So a softer spring in the rear will cause the bike to squat too much, increasing the trail which would certainly make the bike go wide out of turns. Similarly stiffer springs in the front and lots of rebound would have the same effect.

This is all assuming you did not change the height on either front or rear as you mentioned. Are you sure the Penske shock is the same length as the one you replaced?
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post #9 of 27 Old 02-04-2017, 06:37 PM
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Quote:
Originally Posted by sbk1198 View Post
Did you change the spring rates on either shock or forks? The geometry obviously changes dynamically based on braking and accelerating. So a softer spring in the rear will cause the bike to squat too much, increasing the trail which would certainly make the bike go wide out of turns. Similarly stiffer springs in the front and lots of rebound would have the same effect.

This is all assuming you did not change the height on either front or rear as you mentioned. Are you sure the Penske shock is the same length as the one you replaced?
I'm fairly sure the shock is the same length but I'll have to recheck since I measured them both eyelet to eyelet. The spring is stiffer for both the front and rear. I have noticed more squatting in the back out of corners though.

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post #10 of 27 Old 02-04-2017, 07:18 PM
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I'm fairly sure the shock is the same length but I'll have to recheck since I measured them both eyelet to eyelet. The spring is stiffer for both the front and rear. I have noticed more squatting in the back out of corners though.
How's your compression damping on the shock set?

Did you make any other changes, like tires or tire pressure?

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post #11 of 27 Old 02-04-2017, 07:34 PM
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Originally Posted by sbk1198 View Post
How's your compression damping on the shock set?

Did you make any other changes, like tires or tire pressure?
Compression is in the middle of adjustment. No other changes.

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post #12 of 27 Old 02-04-2017, 07:47 PM
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I'm with sbk, sounds like maybe a squat issue? Try adding some compression and maybe take out some rebound in the rear and see if that changes anything? I assume it's sprung right and have the preload set right in the rear?
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Last edited by trackdayhero; 02-04-2017 at 07:51 PM.
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post #13 of 27 Old 02-04-2017, 07:55 PM
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I'm with sbk, sounds like maybe a squat issue? Try adding some compression and maybe take out some rebound in the rear and see if that changes anything? I assume it's sprung right and have the preload set right in the rear?
Spring and preload are set. I will try out the other adjustments. Thanks.

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post #14 of 27 Old 02-04-2017, 08:05 PM
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Hmm...doesn't sound like anything obvious wrong with the bike. So I have to ask...how much different is it really? Are you sure it's not just in your head? When's the last time you rode the bike? Whenever I ride after like 4 months of not riding, I always think there are a bunch of things wrong with the bike because it just "doesn't feel right".
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post #15 of 27 Old 02-04-2017, 08:11 PM
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Quote:
Originally Posted by sbk1198 View Post
Hmm...doesn't sound like anything obvious wrong with the bike. So I have to ask...how much different is it really? Are you sure it's not just in your head? When's the last time you rode the bike? Whenever I ride after like 4 months of not riding, I always think there are a bunch of things wrong with the bike because it just "doesn't feel right".
could also be that. I ride my 300 to work and some back-roads and got really used the handling on it. I'm going to have to ride this bike more often to acclimate to the different characteristics.

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