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2003 yz 250 will not idle rattling noise in 1st gear

The bike seems to run strong when throttled up, but when its in 1st gear and im slowly strolling along theres a rattling noise somewhere down below me. It seemed to happen when i had it opened up, and stopped quikly by using the back break, after that is when it started happening.

akelly000 Jul 31, 2009

It was slack in chain. Thanks It was slack in chain. Thanks
Anonymous May 11, 2010

need more info. Can you reproduce this with the bike secured & running on a stand? Check for anything loose, clips, clamps, fasteners, levers. but since you say it wont idle, Check your YPVS (power valves). make sure everything is tight, the little bracket screws are all in, and the side cam's can move free. also go back to basics, check compression. When was the last rebuild? Note: no timing chain on a 2-stroke! :)

1 Answer

Ottoniel

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Posted on Jul 26, 2009

Ottoniel

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Check if timing chain is not loose. If u found the timing chain is loose check your timing if might jumped one tooth of the gear.

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My yz 250 1994 wornt pull in 1st gear it just makes a crunching noise and the chain will vibrate but the bike wornt go but it works in 2nd gear anyone got any solutions for this

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http://www.carlsalter.com/motorcycle-manuals.asp ,

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Jan 27, 2010 • 2003 Yamaha YZ 250

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98 Timberwolf will not idle and has a rolling rattle sound in crank case sound dose not change when you throttle it up

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Jun 28, 2009 • 2003 Yamaha YZ 250

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Thrid gear in my yz 250 2001 seems to be slipping

For confirmation of a broken third gear tooth, drive slowly and shift up to third gear. Give the throttle a gentle rotation to slowly speed up. Listen for clunking sounds from the gearbox. If you hear it then you know there is a broken tooth. ALWAYS replace the gears in sets. If enough pressure was on a gear to break of a tooth then the same pressure was on the gear it was engaged into. Yes, only one of the two gears is missing a tooth but the other gear has a cracked tooth just ready to break as soon as you button up the engine after replacing only the toothless gear.

I am a bit removed from the cost of todays repairs so I suggest you give a call to your local dealer. If I had to guess, I would say about $600.00. Sorry for the bad news.

Top rating for this answer? Thanks!

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Yz 250 2008 possible 5th gear stripped?

I doubt that any gears are stripped. Believe me you would have known it when it happened at 40mph which is where you would have to be in 5th gear. This is a bent shift fork. The actual gear is fine. The slider gear is not moving far enough to engage with 5th gear. The YZ does tend to have this problem in 5th and 1st. "Dirt rider Magazine " did a story on it. Best to let the shop do the repair as the entire motor gets torn down into about 100 parts.

Please rate this solution. Thanks!

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Apr 08, 2009 • Yamaha YZ 250 Motorcycles

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2003 yz 250 starts and idles but runs rich and bogs as soon as the throttle is applied

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2003 yz 250 will not idle rattling noise in 1st gear

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Ottoniel

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At full speed in 5th gear on my 1990 YZ 250 WR (wide ratio) the rear wheel locked up. I turned off the engine. I was able to start the engine again on the 1st kick. I was able to ride back to camp in 5th...

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96 Yamaha YZ 250 jams in 1st gear. It will run fine in 1st gear for a short time and it will make chunking sound and then it locks the engine down. teeth look fine on the gears.

I Have a 02 YZ 250 that shuts off when i go full throttle. Always in 6th gear on long straights in woods?? could that be a carb prob? idles fine and everything.

My yz 250 1994 wornt pull in 1st gear it just makes a crunching noise and the chain will vibrate but the bike wornt go but it works in 2nd gear anyone got any solutions for this

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Thrid gear in my yz 250 2001 seems to be slipping

Yz 250 2008 possible 5th gear stripped?

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2003 YZ 250

2003 yz 250 starts and idles but runs rich and bogs as soon as the throttle is applied

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2003 yz 250 will not idle rattling noise in 1st gear

1 Answer

Ottoniel

Add Your Answer

Attachments: Added items

Related Questions:

2003 yz 250 starts and idles but runs rich and bogs as soon as the throttle is applied

2002 Honda CR 250 R loud rattle at idle

At full speed in 5th gear on my 1990 YZ 250 WR (wide ratio) the rear wheel locked up. I turned off the engine. I was able to start the engine again on the 1st kick. I was able to ride back to camp in 5th...

RM250 Power Issues

96 Yamaha YZ 250 jams in 1st gear. It will run fine in 1st gear for a short time and it will make chunking sound and then it locks the engine down. teeth look fine on the gears.

I Have a 02 YZ 250 that shuts off when i go full throttle. Always in 6th gear on long straights in woods?? could that be a carb prob? idles fine and everything.

My yz 250 1994 wornt pull in 1st gear it just makes a crunching noise and the chain will vibrate but the bike wornt go but it works in 2nd gear anyone got any solutions for this

98 Timberwolf will not idle and has a rolling rattle sound in crank case sound dose not change when you throttle it up

Thrid gear in my yz 250 2001 seems to be slipping

Yz 250 2008 possible 5th gear stripped?

Not finding what you are looking for?

2003 YZ 250

2003 yz 250 starts and idles but runs rich and bogs as soon as the throttle is applied

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