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Johnny Ringo Liked a reply to forum topic New generation CRf450R Just landed.
5/28/2026 11:34am
Betas lawyers are on the phone
This forum topic has 121 replies.
PulpMxCommenter Liked a reply to forum topic New generation CRf450R Just landed.
5/28/2026 11:34am
So if this is real, we’re getting that big dumb logo on the US HRC bikes too huh?
This forum topic has 121 replies.
GG121 Added a reply to GasGas 125 power valving binding up
5/18/2026 6:53am I believe it blew up from being too lean during a very cold day, had some detonation. Then I rode at a very deep track riding wide open the next weekend and it blew up on lap 2. Rod bearings feel good, zero up and down movement. I’m going to take off the cylinder tonight and recheck my ring gap...
GG121 Added a reply to GasGas 125 power valving binding up
5/18/2026 5:05am I blew up my old cylinder, this is a brand new cylinder. As I mentioned, the pipe was full of gasoline when I pulled it off, and it was all black in assuming from carbon buildup inside the pipe that got washed off. Some of this definitely washed back inside the cylinder … 
GG121 Added a reply to GasGas 125 power valving binding up
5/18/2026 4:59am I can’t feel them with my finger nail. I’ll pull the cylinder off and flush the bottom end with gasoline
GG121 Added a reply to GasGas 125 power valving binding up
5/17/2026 6:39pm Looks like maybe some debris from inside the pipe may have washed back inside the cylinder and caused some scoring……is this safe to ride with?
GG121 Added a reply to GasGas 125 power valving binding up
5/17/2026 4:38pm Thank you for that, I have no idea! Gas flows out of the overflows when tipped over, and the float bowl had gas in it. Took the carb off, confirmed we do not have any shop rags anywhere in the intake. When I took the pipe off, it was full of gas that spilled onto my floor when I walked...
FGR01 Liked a reply to forum topic GasGas 125 power valving binding up
5/17/2026 3:09pm
More oil equals less gas. per volume. So, a Richer oil-gas ratio creates a leaner gas-air ratio. An easy way to think about it... a jet is a fixed size orifice that flows a fixed volume per time. If more of that liquid is oil, that means less of it is gas. Guys will try to get more complicated about it and tell you it's because of the different levels of oil altering the viscosity of the liquid and hence the amount drawn up by vacuum, but just trust my way ! haha It's not a huge difference between 40:1...
This forum topic has 22 replies.
GG121 Added a reply to GasGas 125 power valving binding up
5/17/2026 2:18pm The plug is dry. I’m about to pull the pipe off and the carb. Has great compression. How is 32:1 leaner than 40:1?
GG121 Added a reply to GasGas 125 power valving binding up
5/17/2026 1:25pm Alright boys I got the power valve operating super smooth, and now I can’t get the bike started. Checked the spark plug gap, it has healthy spark. Went one size up on my main jet and pilot jet, now at 520 and 35. And my gas is 32:1 for the break in period. It cranks but won’t start, won’t even...
Rickyisms Liked a reply to forum topic GasGas 125 power valving binding up
5/11/2026 9:59am
I’ve had this problem only with my 2016 150SX, my 2016 125 has never hung up when operating by hand. I polished all arms and barrels, and then slowly started taking away material from the arms and barrels until I got it as smooth as the 125. Polish the control flap for the PV as well as that plays a huge role in the function. Use two stroke oil on reassembly. I always polish the manifold where the barrels ride as well. Can’t hurt it.
This forum topic has 22 replies.
GG121 Added a reply to GasGas 125 power valving binding up
5/11/2026 9:15am Will take it apart tonight and do the marker on the valve and then sand down the arms.
Last2Stroke Liked a reply to forum topic GasGas 125 power valving binding up
5/10/2026 7:13pm
You may need to remove some material from the power valve. Remove the power valve, mark it with black marker, reinstall, rotate power valve, the black marker will show where it's catching.
This forum topic has 22 replies.
GG121 Started a new thread GasGas 125 power valving binding up
5/10/2026 5:04pm I’m rebuilding my top end with a new cylinder, reusing the old power valve with new o rings. It moves freely with the exhaust manifold bolted on, but once i get the side parts torqued it only seems to move about half way.
This forum thread has 22 replies.
FGR01 Liked a reply to forum topic Did I blow up my bike?
5/8/2026 12:57pm
The trans vents up through that PV chamber and then out the vent hose on the cover. So, trans oil gets up in there, to some extent. Also, you can replace the o-rings on the PV center flap to prevent engine spooge from seeping out that way. Clean everything up good in there and the o-rings are also supposed to have grease on them to help them seal and minimize stiction. Also, make sure the trans vent hose never gets pinched or kinked. This can happen up higher where it goes into the frame. If this happens, the trans pressure...
This forum topic has 31 replies.
GG121 Added a reply to Did I blow up my bike?
5/8/2026 7:23am Hey guys long time no see. Had some difficulty getting parts but now I have a new cylinder and im putting the bike back together. Is it normal that the power valves have this much oil in them?
GG121 Added a reply to Did I blow up my bike?
4/22/2026 11:03am 5 minutes
GG121 Added a reply to Did I blow up my bike?
4/21/2026 6:09pm
GG121 Added a reply to Did I blow up my bike?
4/21/2026 10:52am Thanks everyone! Will split the case tonight to inspect the damage.
JMCR250 Liked a reply to forum topic Did I blow up my bike?
4/21/2026 10:35am
As said above, likely a coolant/lubrication issue. New cylinder plating and top end parts, and as said, you'll need to make sure the exploding piston parts did not damage or contaminate the lower end bearings. Sorry. (But be glad it's not a 4-stroke or it would be 2-3 times the expense to fix)!
This forum topic has 31 replies.