Question about 2000 Suzuki DR 125 SE

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Suzuki gn125h worn 5th gear sprockets through case hardening

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Replace it

Posted on Apr 18, 2014

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When im in 5th gear and give it some it feels like it jumping teeth but its not it only does it in 5th gear too?


Hi Ross, could be a loose chain and or bad sprockets but more than likely it's broken teeth in the gear box and for more information about your question please visit the website below. Good luck and have a nice day. 2006 YZ250 manual
http://ymenvom.nl/manuals/M1P831_1.PDF

Mar 13, 2015 | 2006 Yamaha yZ 250

1 Answer

Engine runs but wheels do not move


This could be a few things:
1) Your clutch plates may have worn out so that even when the bike is in gear, it will just rev, but no power will be transmitted to the drive shaft (smaller front chain sprocket is the driving gear, larger rear sprocket on the back wheel is the driven gear)
2) The front chain drive sprocket has come off under the cover on the motor - if the chain is really slack, have a look.
3) The front chain drive sprocket SHAFT has sheared. (basically, meaning that the shaft has broken into two parts as it couldn't handle the drive power (torque) being delivered through it to the chain drive) With the motor on, listen for grinding noises internally
when you rev, from the vicinity of the front chain drive cover. If its rough and grindy, the shaft may be sheared. Then with the motor off, take the cover off and leverage the small chain drive sprocket away from the motor with a screwdriver, and see if the shaft can just be pulled out of its sealed opening. Unfortunately with these bikes, the metals used in drive shafts and motors are not always heat-treated or hardened to the standard they should be, so shearing and premature failure can happen.
4) The gearbox or something in it has blown, unfortunately for the same reason above, quality related.
Its fair to say that these great little bikes are here for a good time, but not for a long time.

Apr 11, 2014 | Razor MX350 DIRT ROCKET - BLUE

1 Answer

Hi just got a kymco stryker, the bloke said that it would make a clunkin sound in 2nd 3rd and 5th (sounds like the chain jumping) but on the way home , he said it was best to stay out of 5th,i did so...


I doubt that the chain was jumping the sprocket. A chain that loose would wrap up around the front sprocket and lock up the engine and/or bust up the center case. It sounds like the bike has some serious transmission problems. The bike probably has bent shift forks and a few busted gear teeth and possibly broken dogs on a slider gear. The bloke ripped you off. The wheel being out of line is not a factor. Please rate my answer. Thanks.

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Sep 14, 2010 | 2005 Kymco Stryker 125

1 Answer

1987 yamaha xt600 teneree slight vibration in 5th gear but you can drive through it could it be my balance shaft timing


The balance shaft isnt likely to jump a tooth, unless someone has installed it incorrectly. And if this was the case there would be problems in all gears

Youve probably done this but check the chain and sprockets are in good condition, and adjusted correctly.

Jun 07, 2010 | 1992 Yamaha XT 600 E

1 Answer

While riding, the 4th and 5th gears do not engage promptly when you clutch and shift the gear. It sort of goes into neutral as one disengages the clutch and accelerate and then falls in place (ie 4th or...


This behavior is the symptom that your clutch plates are getting worn out. Since power is transmitted from the cam shaft to the front sprocket (smaller dia) is better at lower gears but once the rpm increases the clutch plates do not catch up with the cams rotation, hence slipping at higher gears & in between 4th & 5th gears the pulling power of the engine seems to go to neutral before engaging again. Check your clutch plates as well as the sprocket-chain- rear sprocket for wearing out of the gear teeth & replace if required. You will get back full power & acceleration as when the bike was new.............sodeep

Aug 19, 2009 | 1999 Yamaha XJR 400

1 Answer

Jumps out of 5th gear on the highway


Either you have a worn shift fork and fifth is not fully engaging or the synchro for that gear is worn Both are internal and if fork is worn I suggest you have synchro replaced as well..

Jun 21, 2009 | 1997 GMC Sonoma

1 Answer

No 5th gear


Do you mean that the shifter moves normally, and no gear engages, or the shifter won't go into the 5th gear position?
If the shifter won't go there, its probably a mis-adjusted linkage.
If it will go there, but you don't "feel" it go into gear, it could be that the ball and socket linkage rod for 5th gear has popped loose(this is common on higher mileage VWs with worn shifter parts) I recommend an entire shift bushing set be installed and then the proper adjustments can be made... Hope this helps...;-)

Jan 18, 2009 | 1989 Volkswagen Cabriolet

2 Answers

Loud clunking under acceleration


I would expect no damage to the sprockets. They are hardened. I must have replaced 2-3 hundred on Jeeps with Quadra-trac; never replaced a sprocket.

Jan 13, 2009 | 1997 Ford Explorer AWD

1 Answer

Why does my 1993 Acura Integra pop out of 5th gear?


Only 2 thing cause this, worn engagement dogs on the gear pack or worn shifter parts or both, how many miles?

Nov 18, 2008 | 1993 Acura Integra Hatchback

1 Answer

Noisy 5th gear


but no there was definitely a loud whirring noise in 5th gear sort of like a very noisy bearing. The bike still ran in 5th but it was definately becomming increasingly noisy. When I changed down to 4th the noise went away even if I slowed to the rev range I had been cruising in 5th. Same story with the other gears, but the noise returned with a vengence in 5th. Needless to say I rode the rest of the way home in avoiding 5th. Any ideas? I suppose I'm looking at a gearbox strip? Could the noise be anything else? ,Had a similar issue with my 1000S, only 5th gear was noisy - a sound like a dry bearing -other gears were silent. Bike had done 70,000kms and serviced correctly. Had Barry from IME check it out. Turned out to be both 5th gears needed replacing - looked like the case hardening on the gear faces was eroding and pitting. New gears went in and the box properly shimmed and happy to say 6000 kms later all still silent in the gearbox department. Plus the added benefit of slicker gear changes.,,,

Nov 10, 2008 | 1985 Moto Guzzi Le mans III

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