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General SportbikesThis area is made for sportbikes in general. Posts that dont really belong anywhere else besides here. Questions can be answered and addressed to fully understand certain aspects. If your question is Manufacturer specific please post it there.
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2000 Honda F4. I just got done replacing my CCT and that was NOT the problem. It wasn;t making any noise, but I thought it might be the culprit. I have a pretty bad vibration when I get up over 3-3.5k rpms. It has grown to get worse over the season so far. It is now to the point that during a long ride my right hand will go numb from time to time due to the handle bars vibrating. It is engine specific and not speed since it vibrates just reving the motor. I'm wondering could this be some sort of valve clearance, or lifter issue? The bike has 10500 miles on it. My service manual says you don't need to service that stuff till 16k just wondering if it could be the problem also. Any help would be nice.
I hear ya, vibes suck. Ok, I dont know the actuall names of what Im talking about, but here it goes.
I used to have a kawi z1000 and it had bad vibes also. I was told it did that because the motor was mounted directly onto the bikes frame, not onto a sub-frame that was cushioned from the rest of the frame like most sport bikes.
What Im getting at is, could the subframe be damaged in some way, and its in direct contact with the frame? Are there bushings between that can get worn out?
Like I said, just a guess...
__________________
"What? Thats no country I've ever heard of, do they speak English in What?"
Vibes are kinda normal actually.
My '01 F4i has the vibes too but just recently started getting worse, 4-7k when cruising makes my hand go numb too, almost to the point where I can't wait to stop the bike. Bikes got 13k miles on it and I just noticed it this year.
I did however install a 520 chain conversion kit on it -1 frt +2 rear so the engine is running at a higher rpm at the same speed so that probably has something to do with it.
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"She always brings me what I need, without I beg and sweat and bleed......Queensryche/Operation Mindcrime/Spreading the Disease 2001 Honda CBR600 F4i
Miquel Duhamel replica
well i am diving in on the valve clearance check right now....which looks like it is going to be a pain in the @ss. And yeah the motor is bolted right to the frame but I guess there is a brass or some sort of bushing maybe....i will look at it. ANd what do you mean about a carb/TB sync?
throttle body/carb synch just makes sure that the throttle plates are opening the same amount in each cylinder and the vacuum is the same in each intake tract. if they are off, the cylinders try to run at different speeds from one another. it helps immensley. if that still doesn't do it, try these www.hvmp.com they're heavy weight bar ends that dampen vibration in the bars. they cut 50% or more of the vibes out of my handlebars when i put them on mine. well worth it if you ask me.
Bobby
__________________ I GOT YER FRICKIN' TOKEN RIGHT HERE PAL!.
A carburetor synchronization helps a lot. Also be aware that an I4 engine isn't perfectly balanced, so it will always have a bit of vibration. 90 degree v-twins, despite their lumpy sound, can be perfectly balanced and so often vibrate very little.
Thanks guys, I will give the carb sync a shot....but I will need to buy or get my hands on ("Special Tool" as the service manuals always call them) a vacume gauge that reads the 4 vac lines seperatly.
its called a manometer and you can make one using some clear vinyl tubing, a yardstick and some transmission fluid. you only need to be able to measure two cylinders at once. one of the carbs is not adjustable and thats the "master". you synch the other three cylinders to that one. just google "homemade manometer" and you'll find all kinds of em. costs about $5 to make it. its a hassle to do but worth it. you can also pay a shop a to do it but its time consuming and therefor expensive.
Bobby
__________________ I GOT YER FRICKIN' TOKEN RIGHT HERE PAL!.
throttle body/carb synch just makes sure that the throttle plates are opening the same amount in each cylinder and the vacuum is the same in each intake tract. if they are off, the cylinders try to run at different speeds from one another. it helps immensley. if that still doesn't do it, try these www.hvmp.com they're heavy weight bar ends that dampen vibration in the bars. they cut 50% or more of the vibes out of my handlebars when i put them on mine. well worth it if you ask me.
Bobby
WOW i want to thank you so much. It didn't even cross my mind to check out my bar ends....the left side had always been a little lose or stripped I thought....So i looked at them and they were both very loose. I tightend them up and i would say 50% of the vibration is gone..back to where it used to be when I first got the bike 5k miles ago. I still might try some heavier ones and am going to do the carb sync, but I think that might have been all my current problem was since I had noticed since the start of this season it was getting worse and i have never had the numb feelings before. Thanks again.
no problem. glad you found at least part of the problem. you might want to put some loctite on the bolts for the bar ends to keep them from backing out like that again. enjoy the ride!
Bobby
__________________ I GOT YER FRICKIN' TOKEN RIGHT HERE PAL!.
Bar end weights being loose could certainly increase vibration. I would also suggest working on keeping the weight off your wrists and grips. Numbness in the hand is usually due to a tight hold on the grip. Strengthen that lower back especially if you haven't been riding all winter.
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Never out-ride your ability to react (even stop) within the distance you can see (at least on the street).
This area is made for sportbikes in general. Posts that dont really belong anywhere else besides here. Questions can be answered and addressed to fully understand certain aspects. If your question is Manufacturer specific please post it there.
Handle bar vibration..numb hand????
2001 Honda CBR600 F4i
Linear Mode
