Strong vibrations between ~ 5500 and 6500
-
- Heavy Smoker
- Posts: 342
- Joined: Mon Jul 30, 2007 8:18 pm
- Location: Germany
Strong vibrations between ~ 5500 and 6500
Hi Guys
The engine has new pistons since 500km.
everything else has remained the same.
but the engine was not mounted 1.5 years.
and the cylinders were removed.
the engine does not feel healthy.
starts immediately.
idle very quiet, incredibly quiet and inconspicuous.
to about 5000 rpm all normal.
from ~ 5500 - 6500 (with about 1/4 throttle) very unusual vibrations in the footrests and handlebars.
engine in this area very rough and somewhat unwilling.
from 7000 rpm the vibrations are less.
performance, however, is only from 9000-11000.
But even in this area of the motor does not run freely and somehow obstructed.
ok with the peak power can also be a bit of conceit.
drove over a year RG500.
the KR missing 2 cylinder ....
however.
the vibrations are not normal.
i have no idea what may be there....
regards
Dirk
The engine has new pistons since 500km.
everything else has remained the same.
but the engine was not mounted 1.5 years.
and the cylinders were removed.
the engine does not feel healthy.
starts immediately.
idle very quiet, incredibly quiet and inconspicuous.
to about 5000 rpm all normal.
from ~ 5500 - 6500 (with about 1/4 throttle) very unusual vibrations in the footrests and handlebars.
engine in this area very rough and somewhat unwilling.
from 7000 rpm the vibrations are less.
performance, however, is only from 9000-11000.
But even in this area of the motor does not run freely and somehow obstructed.
ok with the peak power can also be a bit of conceit.
drove over a year RG500.
the KR missing 2 cylinder ....
however.
the vibrations are not normal.
i have no idea what may be there....
regards
Dirk
KR-1S 1990
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
-
- Avgas Sniffer
- Posts: 3926
- Joined: Fri Jun 18, 2010 11:29 am
- Location: Oxfordshire
Re: Strong vibrations between ~ 5500 and 6500
Unless your engine bolts are lose I suspect you may have an issue with your crank
-
- Oil Injector
- Posts: 706
- Joined: Sat Aug 08, 2009 9:29 pm
- Location: the netherlands
Re: Strong vibrations between ~ 5500 and 6500
Dirk,
check your balance shaft maybee it is off centre, if that is oke Ben is probably right and it wil be your crank. can't think of anything else that vibrate as much in the engine as you say.
unless the engine bolts are loose,but i had that one time and it didn't vibrate that much because the engine is bolt very tight in the frame.
check your balance shaft maybee it is off centre, if that is oke Ben is probably right and it wil be your crank. can't think of anything else that vibrate as much in the engine as you say.
unless the engine bolts are loose,but i had that one time and it didn't vibrate that much because the engine is bolt very tight in the frame.
Kr1s C1 zeus blue
Kr1s c2 black green
ZXR400 SP
ZXR250A
Kr1s c2 black green
ZXR400 SP
ZXR250A
- JanBros
- Avgas Sniffer
- Posts: 3306
- Joined: Wed Jul 26, 2006 11:50 pm
- Location: the land of Francorchamps
Re: Strong vibrations between ~ 5500 and 6500
I once mounted the balancershaft 1 tooth wrong and the engine shaked A LOT , from idling all the way up. so I don't thinck it will be the balancer shaft.
My ultimate goal is to die young as late as possible !
-
- Heavy Smoker
- Posts: 342
- Joined: Mon Jul 30, 2007 8:18 pm
- Location: Germany
Re: Strong vibrations between ~ 5500 and 6500
Good evening
Thanks for the answers
bad news
unfortunately it was not the engine mount.
it can not be the balancer shaft.
the bottom end was not open since 13000km.
strange.
when I turned the crankshaft by hand, the bearing felt in order.
regards
Dirk
Thanks for the answers
bad news
unfortunately it was not the engine mount.
it can not be the balancer shaft.
the bottom end was not open since 13000km.
strange.
when I turned the crankshaft by hand, the bearing felt in order.
regards
Dirk
KR-1S 1990
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
- JanBros
- Avgas Sniffer
- Posts: 3306
- Joined: Wed Jul 26, 2006 11:50 pm
- Location: the land of Francorchamps
Re: Strong vibrations between ~ 5500 and 6500
is the flywheel tightenned ok ?
My ultimate goal is to die young as late as possible !
-
- Avgas Sniffer
- Posts: 3926
- Joined: Fri Jun 18, 2010 11:29 am
- Location: Oxfordshire
Re: Strong vibrations between ~ 5500 and 6500
Turning something by hand is a lot different to 7,000+ rpm though
-
- Heavy Smoker
- Posts: 342
- Joined: Mon Jul 30, 2007 8:18 pm
- Location: Germany
Re: Strong vibrations between ~ 5500 and 6500
good Morning
I will check the flywheel.
Hope dies last [-o<
no luck with the KR
I've only driven a total of 16000km.
that's nothing.
in these times:
a new (used) crankcase
a new crankshaft
once cylinders recoated.
This is the third pair of pistons
nearly all bearings I've exchanged.
the engine mount had to be welded twice.
the bike was two times faster than I -> new fairing
i call that sporty running costs
and we're talking about a road bike and not a racing machine.
under my bed I have two new crankshafts.
now I know why ...
regards
Dirk
I will check the flywheel.
Hope dies last [-o<
no luck with the KR
I've only driven a total of 16000km.
that's nothing.
in these times:
a new (used) crankcase
a new crankshaft
once cylinders recoated.
This is the third pair of pistons
nearly all bearings I've exchanged.
the engine mount had to be welded twice.
the bike was two times faster than I -> new fairing
i call that sporty running costs
and we're talking about a road bike and not a racing machine.
under my bed I have two new crankshafts.
now I know why ...
regards
Dirk
KR-1S 1990
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
-
- Heavy Smoker
- Posts: 342
- Joined: Mon Jul 30, 2007 8:18 pm
- Location: Germany
Re: Strong vibrations between ~ 5500 and 6500
Good morning
Flywheel is ok
The only thing that is still noticeable, is when I press the finger from the top of the Kips (left side) I feel an irregular tacking very hard.
So the Kips jumping (as far as the free play permitting) irregular hard upwards.
On the right side everything is ok.
If I pluck at the flywheel, I imagine a very minimal free play to feel.
regards
Dirk
Flywheel is ok
The only thing that is still noticeable, is when I press the finger from the top of the Kips (left side) I feel an irregular tacking very hard.
So the Kips jumping (as far as the free play permitting) irregular hard upwards.
On the right side everything is ok.
If I pluck at the flywheel, I imagine a very minimal free play to feel.
regards
Dirk
KR-1S 1990
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
-
- Heavy Smoker
- Posts: 342
- Joined: Mon Jul 30, 2007 8:18 pm
- Location: Germany
Re: Strong vibrations between ~ 5500 and 6500
good evening
the engine is disassembled.
all bearings of the crankshaft are perfectly fine.
i hope the crankshaft is out of round or twisted,
so that the work was not in vain. [-o<
cheers
Dirk
the engine is disassembled.
all bearings of the crankshaft are perfectly fine.
i hope the crankshaft is out of round or twisted,
so that the work was not in vain. [-o<
cheers
Dirk
KR-1S 1990
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
- JanBros
- Avgas Sniffer
- Posts: 3306
- Joined: Wed Jul 26, 2006 11:50 pm
- Location: the land of Francorchamps
Re: Strong vibrations between ~ 5500 and 6500
strange thing to hope for.dirk wrote: i hope the crankshaft is out of round or twisted,
crank trouble would be the last thing I wish for.
My ultimate goal is to die young as late as possible !
-
- Heavy Smoker
- Posts: 342
- Joined: Mon Jul 30, 2007 8:18 pm
- Location: Germany
Re: Strong vibrations between ~ 5500 and 6500
Hello JanJanBros wrote:strange thing to hope for.dirk wrote: i hope the crankshaft is out of round or twisted,
crank trouble would be the last thing I wish for.
that`s no problem.
i have two new cranks under my bed
if it still vibrates with new crankshaft, then I make a campfire in my garage.
the moped burns surely good ...
engine:
the compression test showed ~ 160 psi cold on both sides.
new Mitaka piston after 500km.
cheers
Dirk
KR-1S 1990
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
-
- Oil Injector
- Posts: 872
- Joined: Mon Sep 07, 2009 8:33 pm
- Location: east yorkshire
Re: Strong vibrations between ~ 5500 and 6500
That top ring peg on the right hand piston looks a long way out!
Dan
Dan
-
- Heavy Smoker
- Posts: 342
- Joined: Mon Jul 30, 2007 8:18 pm
- Location: Germany
Re: Strong vibrations between ~ 5500 and 6500
Hello Dan
good eyes!
i have PJ Motorcycle written.
he says I should return the piston.
he sends the piston then to the manufacturer.
everything will be fine. [-o<
i still have the original piston in the showcase.
maybe I'll take this, so I finally rest ......
cheers
Dirk
good eyes!
i have PJ Motorcycle written.
he says I should return the piston.
he sends the piston then to the manufacturer.
everything will be fine. [-o<
i still have the original piston in the showcase.
maybe I'll take this, so I finally rest ......
cheers
Dirk
KR-1S 1990
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
RG500 1987
RGV 250 1992
TZR250 (2MA) 1987
-
- Heavy Smoker
- Posts: 342
- Joined: Mon Jul 30, 2007 8:18 pm
- Location: Germany