Question about 2004 Yamaha YZ 250 F

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93 YZ25 bearing installation

I need to know how the bearing on the top side of the engine hooks up to the rod.

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Locate in the circle in the picture below and is heat installed(To remove,the piston must be heated to about 180 degreesfor the pin to be pressed out

93 YZ25 bearing installation - 18617c9.jpg

Posted on Feb 01, 2009

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There should be no play up and down. Any play is coming from a worn out needle bearing on the crank. A bit side to side is okay and normal. The crank will need to come out then it gets pressed apart and fitted with a new bearing. Price out the difference in cost of fixing the crank verses getting a new $170 crank assembly.What probably happened is a broken piston ring extended into a cylinder port and the piston against the ring is what gouged the cylinder and head. Please rate my answer.
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Was told that my lower end is junk. Seams fine to me but not sure on how to check with out splitting the Case. Is there any little tips or tricks. The rod has alittle side to side play but not...


Hi, spin the engine, with the piston removed hold onto the top of the con rod and start to turn it keep spining it and listen how quiet and smooth it is, the main bearings when worn will sound noisy and feel rough, the big end may lock up when worn,bring the con rod to the top, in the middle of the big end where the pin holds it to the crankshaft, you will see a cut through the rod where the bearing is visible inspect the bearing for condition, the bearings are held in a cage which when worn breaks and the rolers become loose, this may cause the bearing to lock, also check for up and down movement, at all parts of the stroke

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I need to replace the rod and crank bearings on my kx100 and I want to know exactly what I need to take apart to get to the crank. What side of the motor do I take off to get to it?


It is a massive job you are talking about doing there. The engine must be removed, and entirely dismantled. Then the engine cases must be split to remove the crank. Not something you should attempt without a work shop manual, and lots of mechanical knowledge.
The crank bearings need to be pressed on.

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My yamaha 125z was in a bad condition...the engine making a weird noise...


sounds like it needs a top end job,check the compression with a compresion tester ( auto zone $30.00) could be rod bearing or piston bearing going bad( they get slack and start slaping around inside the engine) i would not ride untill you fix if the rod comes apart it will ruin alot of parts.

Jun 09, 2010 | 2003 Yamaha YZ 125

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I have a 2001 kawasaki zr7s. My clutch is acting up. when i pull the lever in i have no clutch. i opened the case to get to the clutch, that rod thats in the middle of the clutch acts like there should be...


the "cluch push rod" should be pushed back by the cluch springs, if there was a bearing on the end it would have broken up and be laying inside the cluch case in bits! if you have taken the cluch to bits there is a thrust washer behind the cluch body and gear box shaft if you left this washer out you wont have a cluch? best bet is get a hayns service book for your bike maybe off e-bay and you will have all the info you need to fix it plus all the photos as well of all the parts

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How too replace connecting rod on a ttr 125l. I have a 2001 ttr 125 with a seized conn big bearing. and I would like to know the proper way of splitting the crank too replace it


The top end comes off then the left and right side covers, flywheel, clutch and shift shaft. Now a case splitter is used to split the center case halves. To replace the bearing you will need a hydraulic press to disassemble and reassemble the crank halves. If the bearing is seized you should replace the bearing, crank pin and the connecting rod. The crank must be realigned using twin dial gages. Personally, I suggest a new crank assembly be purchased from www.babbittsonline.com ( $241 ). I would replace the crank end bearings at the same time and also the sprocket shaft outer bearing and seal. Please rate my answer.

Jan 03, 2010 | 2002 Yamaha TT-R 125 L

1 Answer

I had to replase the piston and fogot how to put it back togther


Put the piston in with the mark on the top of the piston facing the exhaust port of the cylinder. put one circlip in the piston in the bore seated correctly in the groove. place piston over rod facing correct direction and insert wristpin into piston and through the rod needle bearing in the top of the rod. insert other circlip and seat correctly in groove. install compression rings with letter or any markings facing up. markings usually located at end gap on either side. install oil ring with straight ring on top squiggly ring in center and straight ring on bottom all in the same groove which will be the lowest groove on the piston.stagger all the ring end gaps. do not let all the gaps line up. install base gasket on engine case. clean everything and make sure everything stays clean. slide cylinder over piston and compress rings with fingers and finesse cylinder over piston. do not force. put nuts on studs and tighten to spec in service manual. install head gasket correctly and put head on and put nuts on studs. tighten to spec. reassemble rest of motorcycle and get hurt! have fun

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2 Answers

Engine Knock/Rod Bearing


1.No, the connecting rod is not bent from the factory.

2.Bearing is shot for that rod? No matter, as you will be replacing that rod, and the rod bearings for both rods. Doesn't make sense to replace one while you're deep in there, and it's probably in a worn out shape anyway. Besides, if that rod bearing even STARTED to spin, you'd have to have the lower end of the rod bore resized, anyway.

Observe the wear pattern of the rod bearings. Are they worn off to one side somewhat. The wear pattern should be even down the middle of the bearing. If it's off to one side somewhat, you have a twisted crank.
Sounds like somebody hit high RPM's and missed a shift! (Or wound it so tight they went way above the red zone in the tach)

3.Machine the crank? Why? Crank pin surface is damaged? You can only turn it down so much. Probably .020, (20 thousandths), to clean it up, or the crank is shot. (.030 is about a 32nd of an inch. Actually it's .0325)
If the crank pin, (Rod pin) surface is damaged, have a skilled machinist take a look, and see if it will clean up at the minimum required diameter. It's in the book.

4.Search the bike junkyards, (EXCUSE ME! Salvage yards!), for parts, and check Ebay.

5.I know you know this, but everything must be PERFECT when you reassemble the lower end. Not close -> PERFECT!! Otherwise this puppy will scatter across the road, when you hit 65 miles an hour, and 5000 grand on the tach! (When you're on the on ramp approaching the highway)

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Knocking noise on kx 85


The rod should move side to side this is called little end side shake. the correct amount is .8mm to 1.3mm make sure the rod does not have any movement up and down on the bearing.If this is all good your knock may be from a worn piston. If its more of a grinding sound it could be the crank bearings.
-john

Jun 18, 2009 | 2001 KTM MXC 250

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Was driving my o6 kx 85 . was at full speed and it cut out and refused to start and when i try to start it , it would backfire i think its getting a spark but no starting . does anyone know what the...


sounds like you might need to rebuild the top end and check the rod bearings remember when doing a top end always change piston and rings and use new base and head gasket

Apr 13, 2009 | 2001 KTM MXC 250

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