Question about 2005 Yamaha yZ 85

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Sputtering in 1st and 2nd gear on YZ 85 - 2005 Yamaha yZ 85

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  • Yamaha Master
  • 41,824 Answers

Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking check for spark leakage in the dark
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Dirty air filter.
10. Intake air leak.
11. Water, dirt, or rust in the fuel system, carburetor and/or filter.
12. Old dead or bad fuel.
13. Fuel tank vent system plugged or carburetor vent line closed off.
14. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
15. Carburetor controls misadjusted.
16. Damaged carburetor.
17. Incorrect valve timing.
18. Weak or broken valve springs.
19. Damaged intake or exhaust valve.
20. Check for engine trouble codes
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
Dirt Rider Magazine
KDXRIDER NET View topic Sputtering in 1st and 2nd
YAMAHA YZ85 Owner Service Manual
OEM parts for Yamaha
YAMAHA YZ85 Owner Manual

Posted on Dec 14, 2016

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Posted on Jan 02, 2017

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  • 3567 Answers

SOURCE: bogs down at 25 30 mph 1st gear 45 in 2nd gear

  • Check to see that the choke is not partially on.
  • Drain the carbs and clean them with B12 chemtool or any other good carb cleaner. The main jets in the carbs are probably gummed up. To clean the carbs properly they will need to be removed from the bike. Be sure to balance and synchronize the carbs when reinstalling.
  • Remove and clean the petcock water trap and clean the trap of water and rust etc. If a filter screen is present clean it as well.
  • Set idle speed to factory specs. Do not use gas with Ethanol.
This should fix the bog problem.

Posted on Mar 17, 2009

Adrian762
  • 425 Answers

SOURCE: my yz 250 1994 wornt pull in 1st gear it just

Two possible causes, 1. First gear has been stripped and will need replacing, or two the selector is not engaging the gear. Get yourself a manual, I can't help you but you can have a look any way:

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

After assessing the situation you have to make a decision as to your approach. With a manual, sometimes it is good just to inspect the problem area, but i feel you might need professional help.

Posted on Jan 28, 2010

  • 167 Answers

SOURCE: 96 Yamaha YZ 250 jams in 1st gear. It will run

souns like you need to have a look in the gearbox.....a engine strip am afraid!!

Posted on Mar 31, 2010

sisadsl
  • 1508 Answers

SOURCE: hi i have a 98 yz 250 goes brillant 3rd gear problems

possible bent or worn shift fork 3rd gear

Posted on Apr 10, 2010

  • 3567 Answers

SOURCE: gear wont change from 1st

The bike has some bent shift forks. The repair is pretty major and requires some special tools. I include a generic diagram to show how the shift forks move left and right to move a slider gear into different gears. Please rate my answer. Thanks!
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Posted on Mar 29, 2011

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1 Answer

Yz 85 jams in sixth gear


Hi, Anonymous for this scenario you will need your service/owners/ manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $ you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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2004 yz 250 will not shift up into 2nd


internal gear selector bent. your need a manual to fix.

Jul 21, 2013 | 2004 Yamaha YZ 250

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2002 YZ250 1ST GEAR PROBLEM ?? WILL NOT SELECT 1ST FROM THE OFF YOU HAVE TO TAKE OFF IN 2ND BUT ONCE RIDING WILL DROP DOWN IN TO 1ST


Maybe not your answer but.If the bike has sat around for a while,the clutch plates can stick together.Not all,but some.This makes gear selection hard and as you describe,once things warm up,it gets better.When I said about sitting around,I meant for a period of a few months or so at one time.Hope this helps

Feb 16, 2011 | 2003 Yamaha YZ 250

1 Answer

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


Two possible causes, 1. First gear has been stripped and will need replacing, or two the selector is not engaging the gear. Get yourself a manual, I can't help you but you can have a look any way:

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

After assessing the situation you have to make a decision as to your approach. With a manual, sometimes it is good just to inspect the problem area, but i feel you might need professional help.

Jan 27, 2010 | 2003 Yamaha YZ 250

1 Answer

Shifting from 1st to 2nd or 2nd to 1st gets stuck in nuetral on my yz250f. why is this?


Common complaint, and has been discussed in lots of forums. Firstly try lowering your gear change, so you get a positive upward movement with your boot.If you deliberatley monitor your 1st to 2nd changes, you can avoid the trauma of over revving etc. Some riders have modified the cam on the Shifter barrel, where the detent sits in the cam valleys, see link below. Could also be a clutch binding problem, again see link .Good luck.
http://www.thumperfaq.com/clutch_mods.htm

Jan 05, 2010 | 2004 Yamaha YZ 250 F

1 Answer

Sometimes it goses backwards


If this problem only happens after starting the bike it will be your timing.

Check that your pickup coil is aligned correctly aprox 2mm BTDC and that the pick up wires are the correct way around.

If the timing is after TDC it can start the motor in reverse when kicking it over.

Sep 13, 2009 | 2003 Yamaha YZ 125

1 Answer

At high RPM engine sputters like it's flooding.


check your fuel pump and filter,filter may be dirty ,fuel pump may not be pushing anough presser,or your pressure ragulator my be leaking

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1 Answer

Idle flucutation rough take off in 1st and 2nd gear


The spark plug leads in these cars are notoriously bad. I would change them without hesitation just for maintenance if nothing else, but I bet it solves your problem.

Mar 16, 2009 | 1990 Mazda MX-5

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