Added reply in a thread Thoughts on these pistons, YZ125 2/22/2021 6:59 PM

I plan to find that out, that’s for sure. And as soggy mentioned about ignition side crank seal, I’m going to go ahead and replace that as well. I got all excited remembering I had a new OEM dry side crank seal from my old 2000 YZ. Turns out the 2001 ... more »

Added reply in a thread Thoughts on these pistons, YZ125 2/22/2021 4:17 PM

I’ve actually had a 37.5 pilot in....40 is stock, and I think I went the wrong way on the pilot...I have several larger ones on the way, along with larger mains. I was also thinking crank seal(s) but the bike purrs and idles so well, and is responsive ... more »

Added reply in a thread Thoughts on these pistons, YZ125 2/22/2021 10:20 AM

Yes, under domes are dark, dark brown, very hot for sure. I’m going to riches up across the board for starters this season. I was leaning towards a castor type oil for any added protection it may offer, and seeing as I replace pistons and clean PV at ... more »

Added reply in a thread Thoughts on these pistons, YZ125 2/21/2021 5:50 AM

For sure, I will do that. In 15 more hours when I pull this one we’ll see how this one looks. I’m also going to start taking a baseline and regular compression readings. Something I haven’t been doing.

Added reply in a thread Thoughts on these pistons, YZ125 2/19/2021 3:50 PM

I very lightly oil the piston with mix oil, and upon running the bike, I’ll let it warm up 2-3 times for a couple minutes, do a few field rides through the gears, being sure to load it up, then ride as normal. I’m surprised by the blow by as well with ... more »

Added reply in a thread Thoughts on these pistons, YZ125 2/19/2021 2:39 PM

Thank you for the reply’s. Ring gap was checked and was in spec, and cylinder has only had these two pistons in it. New OEM B cylinder with a Pro x B piston. I will check squish before finishing this rebuild and getting the engine back in the frame. ... more »

Added reply in a thread Thoughts on these pistons, YZ125 2/19/2021 1:52 PM

Yea, I ride this bike pretty good. It’s so much fun I’ve actually made it my primary bike, and I’m a 36 year old vet racer. I absolutely love it. As far as leader fuel, yes, that is all I run. The standard VP 110 on piston 2 looks better than the oxygenated ... more »

Added reply in a thread Thoughts on these pistons, YZ125 2/19/2021 9:12 AM

15 hours on each. What oil and ratios are you running? The majority of my riding and racing is on deeper tracks, think sand and Red Bud, tracks like that.

Added reply in a thread Thoughts on these pistons, YZ125 2/19/2021 9:09 AM

Thanks for the reply’s, No splooge for either, powervalve well lubed on both, much more so with 2-R. Actually was a giant puddle with 2-R. The head was cleaner on piston #1 tho, which I find interesting. I’ve went away from oxygenated fuel on the #2 ... more »

Added reply in a thread Thoughts on these pistons, YZ125 2/19/2021 8:07 AM

Here is the head after piston #2.

Started new thread Thoughts on these pistons, YZ125 2/19/2021 8:05 AM

Morning Vital Crew, wanted to get some thoughts on comparison of the two pistons out of my 2003 YZ125. Both pistons have the same approx 15 hours of use, both same Pro-x part. Piston # 1 was ran With Klotz R-50 and VPR leaded and oxygenated fuel. Piston

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This forum thread has 23 replies

Added reply in a thread 2020 YZ250f "Lurching" on heavy acceleration 2/16/2021 11:57 AM

Order a complete OEM kit, I believe it comes with springs too. Yamaha OEM clutch kits are usually pretty inexpensive too. Something like $100 for an OEM steel/fiber/springs kits I’d get for my YZ250F.

Added reply in a thread Part out: 04 and 08 YZ125 2/16/2021 7:49 AM

Hi Kyle, price on the FMF pipe for the ‘04 if available? Thank you.

Added reply in a thread 4 Stroke Nationals 2/14/2021 7:29 AM

That will be a neat project. I’ll do some looking too and if I find anything in the way of pictures I’ll send your way.

Added reply in a thread PW50 thread... 2/12/2021 7:47 PM

Liked a comment on the item @PING 2/5/2021 11:24 AM

SHOTS FIRED! Love the spice Ping.

Added reply in a thread Brian Deegan on The Whiskey Throttle Show- Season 3, ep. 1 1/18/2021 10:03 AM

As always, great show. Look at the above photo of the AMA official with the checkered flag...the dude seems to be hovering in mid air. Nice form.

Added reply in a thread Maxima SC1 1/14/2021 5:43 PM

Give her another chance from the SC1....but if she doesn’t like Suspension Clean...well...THAT is not a good sign.

Added reply in a thread NBC and Sheheen Part Ways 1/8/2021 6:30 AM

I agree with this. Although, not sure anything beats the fading ESPN2 intro music and hearing “Hello everyone, Art Eckman along with David Bailey and Davey Coombs coming to you from beautiful- insert track name-“.

Added reply in a thread 2002 xr80 idle issue 1/3/2021 4:07 PM

This. Clean the original carb, and replace it’s jets with original new OEM, and also replace the float valve, if equipped. The rubber seals on these can degrade over time, so while you are in there I’d do that along with a new bowl gasket. Good luck ... more »