rt125 starter motor

[fresian rt125]

Over the last couple of days, I have been unable to start my rt. With The ignition on, when I push the starter button, I can hear the starter motor spinning, but not turning the engine over. Something is not engaging. I removed the starter motor and checked the splines at the end of the shaft, and these seem to be okay....Any Ideas???????

[DAVID THOMPSON]

below is my ramble on the problem
from my note this is a bit of a mess as i never had time to do a good edit
but it will get you going

BROKEN PART WARNING
Aug 26 2002 update Nov 11 2002 at bottom THE RT 125 I HAVE MADE A LOUD POPING SOUND COMING OUT OF THE PARKING SPOT AT MY HOME AND THE MOTOR DIED I TRIED TO START IT AND THE STARTER SPINS LIKE THE WIND THERE IS A FREEWHEEL CLUTCH BETWEEN THE STARTER AND THE BALANCE SHAFT TO START THE MOTOR THE FREEWHEEL IS A SPECIAL UNIT A CLUTCH TO DISCONNECT THE STARTER WHEN THE MOTOR STARTS IT BROKE BUT THE BIKE CAN BE BUMP STARTED BUT THIS SHOULD NOT BE DONE BECAUSE IF THE FREEWHEEL IS BOUND UP YOU CAN CAUSE MORE DAMAGE IF YOU REMOVE THIS PART THEN YOU CAN PUT IT BACK TOGETHER AND RIDE IT HOME BUT YOU WILL HAVE TO BUMP START THE BIKE THIS IS NOT RECOMMENDED UNLESS YOUR STRANDED AND DESPERATE AS YOU WILL NEED SPECIAL TOOLS AND A AIR IMPACT AND IS BEST DONE AT HOME OR IN THE SHOP ALSO THE SHOP MANUAL HAS WARNINGS AND SHOULD BE READ BEFORE WORKING ON THIS PROBLEM THE WARNING IS THAT IF THIS HAPPENS YOU SHOULD NOT RUN THE MOTOR UNTIL THIS PART HAS BEEN REMOVED AND A NEW OIL FILTER AND OIL PUT IN THE BIKE SO THAT THE GROUND UP PIECES ARE REMOVED FROM THE MOTOR DON'T CAUSE MORE DAMAGE THAN IS ALREADY DONE… update problem fixed but i think part of it may have been the wrong oil I now use Yamaha oil for 4cycle bike motors with wet clutches and the bike seems to run much better on this oil
AR DAVE THOMPSON RT125 IN West Virginia
NOTE SPRAG CLUTCH (FREEWHEEL ) NEEDS GOOD CLEAN OIL OF PROPER TYPE

Emails I sent to a fellow rt125 rider
More About the starter motor freewheel sprag clutch
Posted: Fri Sep 10, 2004 10:46 am Subject: the freewheel try all below





MORE
ramble from my notes
Posted: Sat Sep 11, 2004 12:31 am Subject: Re: Freewheel hello

yes I have a rt125 about 25 months 8500 miles
and the freewheel in mine died to... this is a weak spot in these
bikes use Yamaha oil for 4 cycle engines and things should go ok
be careful and don't take the new one apart or you will ruin it
if you want to see how it works play with the old one

think of it as a smart roller bearing with the rollers shaped like a figure 8
and spring loaded at a angle as motor runs it slips in the oil
if motor not running but starter turns the oil causes drag and the figure 8
stands up and binds turning crank if motor runs faster than starter it
slips this is why I say Yamaha oil the proper oil is the secret to its long life
if you have 2 bikes order 2 of them
and I forgot
http://www.atkusa.com
may have them in stock they used the same motor
in a 125 in 2002 or 2003
tell them you have a fun -x as some were sold as atk 125 enduro
ar Dave
Dave 2002 MZ RT125 in WV USA plus 1995 Saxon Tour (rotax motor)500cc

THE SPRAG CLUTCH OR FREEWHEEL REQUIRES GOOD CLEAN OIL

DO NOT START BIKE IN GEAR WITH CLUTCH PULLED IN AS THIS LOADS
THE FREEWHEEL TOO MUCH
DO NOT RUN BIKE BACKWARDS AND STOP IT WITH THE CLUTCH
AGAINST A STOPED MOTOR

WHEN WORKING ON MOTOR DO NOT FORGET TO LOCK THE CRANK WITH THE LOCKING
TOOL
WHEN WORKING ON THE CLUTCH IF YOU DON’T HAVE A CRANK LOCKING TOOL
DISCONNECT THE BATTERY AND REMOVE THE STARTER ALSO WHEN WORKING
ON CHANGING THE TRANSMISSON OUTPUT CHAIN SPROCKET
AS ANY THING THAT WILL CAUSE THE STARTER TO TURN BACKWARDS CAN BREAK THE SPRAG
CLUTCH
NOT UNDER STANDING HOW THIS THING WORKS CAN CAUSE BIG BUCKS IN REPAIR BILLS

AROUND $80 USD FOR THE PART PLUS SOME OTHER STUFF MAY BE $100 OR SO IF YOU KNOW
update more like $140usd as of may 2005
i am trying to do a video tape of how to repair this
see link to my blog at bottom of page

search h9it words freewheel free wheel starter
spraga freewheelfreewheel freefree