Question about 2002 Yamaha YZ 426 F

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Impella shaft wear

Is there a toerence for wear on the impella shaft

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No specifications on wear by factory, but if the shaft shows sighs of wear...out of round...grooves etc you will need to replace...if there is any side to side(up-down) play then the oil seals need to be replaced

Posted on May 03, 2009

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How do i fix a no fire on a honda cb 100?

Take a close look at the shaft where the lobe is, is there play in the shaft? High mile bikes the bushing or shaft can wear down and not open the points correctly. You did a good job troubleshooting so far.

Jul 04, 2015 | 1971 Honda CB 100

1 Answer

2003 Dyna wide glide making a ticking noise at high rpm's and has gotten progressively worse over the last couple years \

You engine is a pushrod type engine rather than the overhead cam design of most other bikes on the road. All Harley's are designed this way other than the V-rod models. As such, it has rocker arms to open and close the valves. These rocker arms have bushings that ride on steel shafts. These parts wear but the hydraulic tappets take up most of the wear but can't compensate for the looseness at high RPM's. This would be my guess. And, since I can't hear the noise, a guess is the best I can do. To find out if this is the problem, you'd have to take your rocker box covers off and remove the rocker arms and the shafts to measure the amount of wear in all the parts. The rocker arms can be "re-bushed" meaning you can have new bushings installed and reamed out to fit the new shafts you'll need.

Good Luck

Sep 16, 2011 | Harley Davidson FXDWG Dyna Wide Glide...

1 Answer

I have a loud tapping in my front rocker box on my 2000 harley 1200 sportster custom i have pulled top and middle covers but the valve springs look fine and pushrods seem fine an thoughts?

I could be the bushings in the rocker arms and the rocker arm shafts. Bring the piston to top dead center on the cylinder that has the noise. Both valves should be closed. Allow about five minutes for the tappets to bleed down on that cylinder. When you can spin both of the pushrods with your fingers, remove the 5/16 inch bolts on the right hand side (pushrod side) of the head. This should allow you to push the rocker arm shaft out and remove the rocker arm. You may have to gently tap the rocker arm shafts out but it should not be difficult to get them out. Do not mix the rocker arms and their shafts up. Keep them together. Check the bushings in the rocker arms and the rocker arm shafts for wear. The bushings can be replaced and use new rocker arm shafts if this turns out out to be the problem. Check the face of the rocker arm where it pushes down on the valve stem for wear as well.

Good Luck

Sep 06, 2011 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

Bike runs nice but after a long run when hot 1st gear grumbles when you pull away

That sounds like a worn lay shaft. Check the oil viscosity and maybe include an additive like Slik50 etc. to give the shaft a bit more of a cushioning against wear.

Mar 03, 2011 | 1996 kawasaki GPZ 1100

1 Answer

Coolant is slowly leaking out of the small hole on the bottom of my water pump casing. What do I need to do to fix this?

That is like a vent hole, but the seals for your water pump should be replaced. Also, check the shaft for wear from the seal, as they can "cut" into the shaft. Then the shaft is bad also.

Aug 11, 2010 | 2004 Yamaha YZ 125

1 Answer

When replacing the quad seal and main shaft seal are there any other seals that go in that general area.. on 1998 softtail 5 speed transmission??

Yes, there is a small seal that goes inbetween the mainshaft and the final drive gear. If I were doing this job, I'd also replace the seal on the backside of the inner primary as well.

To replace the small final drive gear seal, you will need a special tool to remove the inner race of the primary bearing from the main shaft. Of course, I've seen lots of times when this seal was not replaced while in there with no consequences.

Also, check the splines on the inside of the front belt pulley. These are bad about wearing. I have seen therm wear to the point that they strip out and no longer drive the motorcycles. If allowed to wear too much, they'll start a wear on the final drive gear as well. You do not want that to happen as it will require the replacement of the final drive gear to repair this damage. High Dollars. Good Luck

Mar 03, 2010 | 2000 Harley Davidson FXST Softail Standard

1 Answer

Front sprocket does not locate on out put shaft it moves. Is this play a design feature I cannot see ant wear on the shaft. Help.

You simply have the wrong sprocket ,there should be no play at all ,allso carefully check the spline edges they should be sharp edged if rounded your shaft will need replacing.some times a very small play can be felt ,but should not be visual. is the sprocket of good quality ,cheap items can be a bit dodgy.

Mar 02, 2010 | 2001 Yamaha SR 125

1 Answer

My YZF 426 2002 model has been rebuilt twice but radiators keep pressurising and pumping coolant out the over flow pipe, it has a brand new radiator cap and impella

sounds like the raditor could be blocked or the pump is spinning to fast install bigger radiator pipes also fill it with coolant completely to the lid and also bleed the air out off system get back to me if need any more help or you have done this

Sep 29, 2009 | 2002 Yamaha YZ 426 F

1 Answer

Worn seal behind impella of yz250f yamaha

Take the water pump cover off, not the entire clutch cover. The water pump gear is driven by the primary drive gear on the crankshaft so you can put the bike in gear, stand on the brake and loosen the nut. I believe the impeller may be reverse threads. I'm not 100% positive of that.
You can also use a 3/8" air impact wrench to remove it.

Jan 02, 2009 | 2004 Yamaha YZ 250 F

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