Vibration and running lean

[Sparti]

Here you go

[Joe Houle]

VERY 007..look great

You could put your weed in there

[Avi8or]

Assuming your handlebar is aluminium, I'd have some copper grease on them threads otherwise the bar ends will corrode/stick to the handlebar after some time and there'd be no way to get 'em off without destroying the bars.

[Brrapp]

They look awesome!

[antisocial]

Assuming your handlebar is aluminium, I'd have some copper grease on them threads otherwise the bar ends will corrode/stick to the handlebar after some time and there'd be no way to get 'em off without destroying the bars.

anti-seize is your friend.

[Avi8or]

[Sparti]

Ok a follow up ... I've changed the tune back to the 20214 and I'm still getting a vibration from 4k and above.




Believe it or not but my fancy bar ends didn't help I fact they caused more vibration - clearly too heavy. My mates going to knock up the same design but in aluminum,hopefully that will work.




Anyway I'm still getting a tingly vibration in the pegs,bars and through the tank where the legs grip it.


I've recently done an oil Change and this time went for a 10w-40 instead of a 15w-50. Could this cause any extra vibration..




also ive recently done a mod to my air box - just copying someone from an old thread. Ive cut back the inlet tubes and also cut/filed back the battens in the bottom part of air box. The question I have - Is there anyway doing this mod could cause air disturbance that could then cause the engine to run badly and cause a vibration in the running of the bike?

[Bad Santa 1050]

Hey Sparti,Did you end up resolving your 4k rpm vibration issues? Or are you just making do with the 20214 tune and accepting the vibration?

Is there anyway doing this mod could cause air disturbance that could then cause the engine to run badly and cause a vibration in the running of the bike?
In Short - Probably YES. Looking at the mods you've done to the airbox, I assume that the objective of modifying the airbox is for an increase in power/performance. The way this should improve performance is via the increase in air getting into the motor. IF the modifications you've done, DO indeed increase the flow/amount of air going into the motor, then there's a GOOD chance it could cause the motor to run "badly" (I would describe as un-smooth/loss of smooth running) and a feeling of vibration. My reasoning is that if you've increased the airflow going into the motor, but left the fueling the unchanged, then it will create a lean(er) running condition, which is likely to result in the motor seeming to run rough because their isn't enough fuel to match extra air it's ingesting. Incidently, when in relation to the commencement of the vibrations did you do those airbox mods?

[Sparti]

^ your post is quite timely Santa. I took the bike for a 40min ride down one of our FWY's and held the revs around 4000 -4500. The vibration / resonance was so bad that my hand went dead.

When I got back I replaced the air box with a standard one ( which I got delivered the day before) and bingo, no more vibes.


I agree, it was definately running lean but I always thought a lean running engine would surge and wane when kept at a constant rev/speed. I didn't think it would cause such a dramatic buzzing throught the bike.

[Bad Santa 1050]

Well I'm glad you were able to isolate the cause of the vibrations. By the sounds of that, it was lean. Had there been less air going into the motor after your mods, the resulting excessive rich running would've made her bog down as you tried to open up the throttle. That normally won't cause vibrations like you described either. From all that, I'd say that if your bike was custom tuned she would almost certainly make more power than if custom tuned with the stock airbox. It'd be a pain in the arse lugging up the modded airbox up to Sydney on the back of Speedy for the custom tune, and then lugging the stock one back to Melb afterward. If you get the time, perhaps refit the modded airbox and try it with Joe H's TOD and see if the vibes are still there. His TOD was made for a higher flowing airbox, so I'd be fairly confident it has enough extra fuel to deal with the extra airflow. I'd be surprised if it didn't.