excessive vibrating!

[spitfire123]

hi all,

just did a top end rebuild and changed some of the gaskets.

tried removing the flywheel with a flywheel pully....but it wouldent budge...so i left it as i dident need it off anyways.


this was the 1st time of starting and it started 1st push of the button....(had no gearbox oil so only started it for like 3 mins and left it in neutral to tick over)

but there is a problem...anyithng over say 3k (not exact becaus ethe clocks arnt on the bike) it vibrates ALOT, Like the floor is liraly shaking.

now why is this? could it be that there is just no gear box oil in it or is it somthing else?


cheers
Luke
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You won't be able to eat my dust......As it'll settle before you get there.

[MarJay]

Hmmm... you do realise that even in neutral lots of the gearbox parts actually turn? And the speed of the turning is a function of the revs?

Put gearbox oil in before you start it again.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[colin1]

[spitfire123]

[spitfire123]

[spitfire123]

in reply to my own post above:

put new oil in gearbox.

i took the starter gear off and bump started it.....it still vibrates like hell.

i then double checked all the engine mounts....all tight....


the engine runs perfrct and dosent miss a beat.


but it is vibrating beyond belife...you can sit on it for maby 30 seconds just above idol and you can barly stand afterwards.

this thing is reeeeeeaaaaallllly pissing me off now..ive worked 5 days on it to get everything up to standerd and spent alot of oney on it....only to find anew problem.

ANY advice is REALY apriciated as im totaly stuck.

cheers all
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You won't be able to eat my dust......As it'll settle before you get there.

[Vincent]

I've seen a lot of flywheels damaged by not using the correct puller. If the Mito has a threaded hole in the middle of the flywheel for a puller, screw one in tight and give it a sharp hit with a hammer to shock it loose. If you use a tripod type puller, you can distort the flywheel or break the magnets inside. Not sure how relavent this is in your case but if the flywheel is out of true then it would vibrate and eventualy destroy the main bearings.
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Space Is Deep

[Kickstart]

Hi

Against popular belief I don't work on Mito engines all the time .

However I have heard many times that the Mito workshop manual on timing up the balance shaft is wrong. If the balance shaft it out then it will likely make the vibration far worse rather than canceling it out.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[spitfire123]

[spitfire123]

[Kickstart]

Hi

The drive for the balance shaft is on the clutch side of the engines. Take the clutch cover off and you will see it at about the 5 o'clock position of the clutch.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[spitfire123]

[Kickstart]

Hi

Under the clutch cover there is a cog driven off the primary drive that drives the balance shaft.

However, rereading your original post you only took the top end apart so you shouldn't have gone anywhere near the balance shaft.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[spitfire123]

[spitfire123]

[Kickstart]

[MaybeGuy]

you hear about loads of people putting their mitos together like this.
the manual that cagiva put out is wrong, so if you find the settings for the balancer shaft, do the opposite and it'll be fine. cagiva try and get you to set it 180 degrees out, making it vibrate like hell.
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[spitfire123]

[Kickstart]

Hi

Sounds like you have got it right, or maybe one tooth out by mistake.

The manual in English says bottom dead centre, but if you rear the other languages they say "punto morto superiore", "point mort superieur", "totpunkt positionieren" or "punto muerto superior", which all seem to be top dead centre. Basically the manual is right except it should be top rather than bottom.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[spitfire123]