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Design change GS 1150 to improve Vibrations?

  • Thread starter Thread starter kz
  • Start date Start date
K

kz

Guest
I have a GS1150 with vibrations in the handlebars.

So far I have:

Balanced the wheels, changed tire type, replaced steering stem bearings, replaced engine mounts, replaced engine, and replaced wheels, put extra weight in the handle bars.

All of this is of course not because only of the vibrations, it's because of normal maintenance or tuning.

My question is if anybody know if it is possible to change the frame design, by i.e. welding some extra support or similar or if there is any other idea to improve the vibrations in the handlebars.

The worst vibrations occur at 4000 ? 4500 rpm.

Anybody blueprinted the engine?
Anybody mounted different engine mounts?
Anybody redesigned the frame?

/Karl
 
I assume you mean the "Buzzing" in the bars? If it is, there is pretty much nothing you can do. Its coming from the engine and can't really be removed. All three of my 1150's do it.
 
Has anyone put an 1100 engine in an 1150 frame? From my experience, the 1100's didn't vibrate near as bad as the 1150's. Would this get rid of that annoying vibration.
 
I think just changing to a 1100 crank would do it. That is where the problem is.
 
cbxchris said:
I think just changing to a 1100 crank would do it. That is where the problem is.
Click to expand...

Please explain further, I live in rural NSW Australia, so I have to know what is wrong in more detail as availability is a BIG problem for any mods.
If there is any chance I can deal with it locally it would be a huge boon to me and would save me a small fortune in freight.
I was once told the biggest problem in GSX (GS 16V) motors was the gearbox bearings wear, and that they are a lot of the reason for the vibration, a point I believe to be valid as my 1170 Katana motor is a lot smoother since I replaced them.
Dink
 
The 1150 crank not only had different rods but a different number of teeth on the crank/clutch hub. I have done it to drag engines. For wahtever reason the 1100 crank just balances up better. I suspect if a crank was sent to falicon to be welded and balanced it would make a huge difference. I agree Dink the tranny bearings are junk. On my 3 speeds I did not run roller bearing. I ran cylindrical bearings. I would not recommend them for the street. These bearings had no retainer clip(red locktite) and on a 3 speed the gears were larger than the cases making it necessary to widen the gear box area which allowed for these larger bearings. It was amazing the differnce with those bearings over rollers. The rollers that I did use on 5 speeds were super high quality bearngs with the notch in the inner race where one extra ball has been inserted...a much better bearing. I have to admit my 1150 vibrates badly in that 4K range. I changed the gearing which really helped it. I know you want a hayabusa Dink....they are as smooth as silk. They even have a adjustable crank shaft balancer in case your engine needs to be fine tuned for vibration. In my opinion the best engine out since the 1100/1150. Superior in any way to the gsxr series. I`m waititng to see waht comes out this year...05`s. I may get another busa. I love em.
 
Chris
So what you are saying is that it is a matter of balancing the crank and rods as an assembly to Deal with the "vibes"?
Dink
 
Thanks for your answers,

If I understand you correct, balancing the crank is important.

I am preparing a "new" 1198 engine and it is still not assembled.

I have access to both a balancing machine and a portable balancing instrument; the problem is how to mount the crank in the balancing machine.

My idea is to assemble the engine a measure the unbalance, the unbalance correction could maybe be done on the flywheel, but on the ignition side is not really much to drill or put correction weights on.

An other possibility is to split the cases after each measurement and make the correction on the counter weights i.e. five times?? If the vibration goes away, I am prepaid to do that... :roll:

I couldn't fully understand the tip with the gearbox bearings; do you mean I should change them to an other quality/type?

I love this bike and don't want to change to a newer one, but after two-three ours of driving the vibrations/buzzing really hearts my hand especially the left.

/Karl
 
Karl
I think that stock replacement is acceptable, But I tend to lean towards the Ceramic Gearbox bearings advertised on Gszone.biz.
I am told that any wear in the gearbox bearings allows the gearshafts to "rattle" around and contribute towards vibration.
Dink
 
Those extra ball bearing are very good and much cheaper at a bearing house than going to suzuki for stock ones. Its easy to spot them the inner race will have a notch in it. That is how they have to make them to load that extra bearing. If you notice stockers don`t have that notch. I`m sure the bearings Dink talks about are probably even better. From what I have been told...this is all passed down info is that suzuki did not alter the crankshaft wieghts on the 1150 when they changed to the different rods and clutch hub drive. It made them vibrate. I am also told even by balancing the 1150 will vibrate more regardless. Falicon used to tell me to send them a 1150 crank they would install katana rods ,1100 clutch gears, knife edge the crankshaft throws,polish them and the vibes would be gone. I did this and to be honest they vibrated but I have to also admit I ran a large engine(1425cc). I don`t think you will ever get a roller crank as smooth as a plain bearing crank. With all that said if I had a engine down I would balance it ...there`s not much to lose.
 
Hmm, I think I will do some vibration measurements on my now mounted stock engine and see if there is something more to find out.
 
The vibration thing is a surprise to me. I must have just been lucky for whatever reason as my 85 1150 is silk smooth at any rpm. Its a lot smoother than my 8 valve 750.

Earl
 
I am also suprised. Several threads have referenced a front end shake or instability due to the 16" front wheel. I have experienced that but no vibration. Changing to a GSXR front end appears to have solved my "shaking" problem.

If any of you have experinced both, please elaborate. This vibration thing has me curious. Planning to build/rebuild my 1150. I dont want to re-create a problem with my new engine.
 
Yeah, I have no vibration in my 1150 and I have even replaced the stock leaded handlebars with hollow stainless tubing. It didnt make a bit of difference.

Earl


tyler1150 said:
I am also suprised. Several threads have referenced a front end shake or instability due to the 16" front wheel. I have experienced that but no vibration. Changing to a GSXR front end appears to have solved my "shaking" problem.

If any of you have experinced both, please elaborate. This vibration thing has me curious. Planning to build/rebuild my 1150. I dont want to re-create a problem with my new engine.
Click to expand...
 
Mines pretty bad Earl. I suspect slipping the crank out and sending it to falicon would reward me but I`m to sorry. :?
 
MY GS1150 does the same thing....
4-5000 revs and vibrates like a sob
when i first got the bike i thought there was something seriously wrong
but i guess it sounds like its a common thing, and ive basicly gotton use to it, I thought maybe changing the gearing on the rear sprocket , to shift gear change points couse basicly arround town it drives me batty, which way would i go any ideas?

allso when I first got my 1150, my swinging arm pivet bolt was finger tight, and made me think I had bought a real lemon, proper maintenance changed the whole feel of the bike,

I run flat drag bars on risers mounted where the orignal clipon mounts were mounted...and im sure that contributes to my bikes vibration
 
I havent a clue why the difference. If it is the crank, it seems strange to me that apparently the majority of 1150's have an out of balance crank.
At 4-5000 rpm, my mirrors dont even go out of focus like they do on my 750.
I get a noticable vibration level above 9K, but that isnt a big problem.

Earl

cbxchris said:
Mines pretty bad Earl. I suspect slipping the crank out and sending it to falicon would reward me but I`m to sorry. :?
Click to expand...
 
Go and ride a Harley with a rigid mounted motor in it and THEN ride the 1150 :wink:
 
Mine was pretty bad. I'd get numb fingers after a ride. I changed the rubber engine mounts and it made a drastic difference. A few weeks later I synched the carbs and it fixed the vibration even more. It still has a buzz at 4000-4500 rpm, but nothing compared to what I had previously. After a 850km ride, I had no numb fingers or anything. I'm just trying to figure how bad are the vibrations you're getting.

I guess I've been lucky as well.
 
Earl and tyler1150 you are both definitely giving me some hope that it is possible to fix the problem, :D You are the first people I here saying that they don't have vibration problems with the 1150.

I spoke to a former dealer here in Sweden and he said that they had a lot of complains regarding vibrations at the time then the GS1150 was sold new.

The vibration problem was according to him only related to the 1150 and not to the earlier models.

One issue at the time was that the frame cracked just in front of the side stand, mirror fasteners broke, fairing fasteners broke etc.

If the frame was cracked the vibration went much worse, they had to take back some bikes and weld the frame on waranty at that time, he said.

Suzuki gave out recommendations that it was very important to retorque the engine mounts, different handlebar and fotpeg weights where tested, i.e. the weights on 84 and 85 model differs.

His experience was that the vibration problem was more or less unsolvable.

However, unsynchronized carbs and wrong torqued engine mounts made it worse.

His personal thought is that the problem is rather related to the frame design or the mounting design of the engine when to unbalance of the crank.

I read that tyler1150 has a GSXR fork maybe that is a solution???

Earl is your 1150 "pure" stock? Even the rear shock absorber?

/Karl

BTW:

Having second thoughts about rebuilding my engine if I have to live that @?@@@?? vibrations....
 
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