help - Yamaha FZS 600 Fazer 1999 engine vibrates/wobbles...

[Martin7R]

Hello everyone around here,
Firstly I want to warmly greet everyone in this forum, I just have registered here.

What brought me here is an issue with my bike.(fzs 600)
Overnight, in the morning on my way to work as usual, I felt the engine started vibrating and produced an unstable wobbling sound and now on the second day, the vibration has been increased significantly and I can also smell of unburnt fuel coming out from exhaust.The wobble is very annoying,feels just like some pistons does not burn fuel(i am not sure, thats why I need help), almost impossible to ride, but I had to get from A to B and I am really worried about the bike.
Just got my licence(18yrs) and restrictors cerificated ( 33 bhp ).

PS.It vibrates when I accelerate or hold the throttle.No vibration when loosen the throttle.

+Chain and sprockets are in a very good condition
...

Any possible ideas, what causes the bike to vibrate?Any help would be highly appreciated.

Martin7R.

[snikks]

You will probably get a better response by asking this kind of question in the workshop section buddy, all the hardcore mechanic types hang out there .
____________________
- CBT: 02/01/11 Theory: 26/04/11 Mod 1: 19/05/11 Mod 2: 19/08/11
- 2007 Honda XL125V Varadero (Sold), 1999 Yamaha FZS600 Fazer (Sold), 2001 CBR600F

[Martin7R]

[Mikey3]

check engine mounts, may not explain the unburnt fuel smell but someone on here once spent ages trying to find mechanical issues and it turns out his engine mounts were loose.

Mike
____________________
'04 Yamaha WR450F
'99 SV650 Streetfighter Project - mid build
'Motorcycling is about what you do; not about what you own, or how much you spend on it'

[Martin7R]

[N cee thirty]

maybe loose exhaust header
____________________
'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[Martin7R]

[Mikey3]

[temeluchus]

Could be the carbs are badly out of balance.
____________________
Some shite cruiser. Now with guns and FREEDOM!

[Martin7R]

[Martin7R]

[Martin7R]

Replaced spark plugs today and checked for spark - all OK.
Removed restrictor washers.
Checked engine mountings.
No loose fuel pipes or damaged pipes.

when removed old spark plugs, they were wet.
All the same as before, vibrate and noticed that the engine is hard to start when its usually easy to start just 1 sec, but now I have to twist throttle and still takes 3-4 sec to start and hard to start.'

also noticed that the fuel consumption has increased significantly.

What could it make behave like that ?

[Pete.]

Were all of the spark plugs wet? If so, check the choke is operating properly. My guess is that the choke is stuck on, perhaps the cable was kinked or stretched when the restrictors were fitted.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Martin7R]

[N cee thirty]

top left of the carbs there's a plunger that shoudl come in and out when you move the choke lever, if it doesn't go back in fully thats your problem
____________________
'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[Martin7R]

[Fisty]

The carb rubbers on these split, this can give odd running and would explain the unburnt fuel. Also if it has been restricted using washer it would have disturbed the carb rubbers making the splits worse if it has any.
____________________
Quietly and consistently taking the piss.
TL1000R | Hayabusa | ZXR400 | TL1000S | Bandit 400 V
Fatter and faster than Fret

[UnspeedySam]

[Pete.]

[Martin7R]

Yes the lever is moving with no problems.And now im pretty sure that there is too much fuel going in engine.
Thanks Pete, I am going to see the carbs inside, and restrictors were fitted by local motorbike shop, and I dont really know if they did anything more , but how I check the float height?

[Martin7R]

I don't think the collectors (rubbers) are disfunctioning, because then like beechbone said, it would make lean not so rich fuel mixture that there is increase of fuel consumption and unburnt fuel coming out of exhaust.

[N cee thirty]

as said on the fazer forum, its a common thing for the rubbers to surface crack, still air tight, but could try the wd40 trick
____________________
'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[Martin7R]

[temeluchus]

[Pete.]