That's the first thing I check. I've seen plastic fragments in the fuel filter from the factory more than a few times.

Change the in-line fuel filter.

Properly greasing a bike is a several hour endeavor. At $100/hr labor rate the dealers would lose their a$$ if they did a proper grease job on off-road motorcycles as part of normal PDI's. If your lucky, some muppet might even put the footpeg cotter ... more »

I ran the piston and found that the spray on grey coating was actually thicker than I'd seen on previous Vertex pistons. we have well over 30hrs on the piston and all is fine. This doesn't mean you still shouldn't measure everything to be safe. When ... more »

Piston looks ok. Wear on the powervalve shaft and bracket look normal as well. When the powervalve opens, the springs "over-travel" slightly to make sure the valves themselves are full opened. The result is small grooves like what your picture shows. ... more »

I've never seen a dealer grease a bike as part of a normal PDI. What you see is what you get from the factory.

I have a '21 350 SX-f and I've let it sit for months on end and it will crank right up. My '19 350 never had issues either. I'd take it back to the dealer.

'89 CR125 is the last year of the ATAC cylinder and '90 -'99 are the HPP valve motors.

AETC is Suzuki's powervalve system. It stands for Automatic Exhaust Timing Control.

Lurching can also be a sign of a chipped tranny gear. I'm hoping this isn't the case.

That piston crown was pitted away by detonation (pre-ignition). You got very lucky that you didn't scatter that motor. The causes of detonation are: -low quality fuel -incorrect ignition timing (follow service manual instructions to verify correct ignition ... more »

Try replacing the jet block gasket with a JD replacement gasket. Mikuni's have been know to have this gasket fail and make jetting difficult.

Two exhaust valves crashed into the piston? That's a pretty catastrophic failure. You said the rod and crank looked fine, but I'd recommend splitting the motor and inspecting the crank out of the motor. That rod took a pretty good hit. The YZ250f's have ... more »

You have to split the cases to replace the left side crank seal. The stator mount in the case blocks the seal from being removed from behind the flywheel.

That is the highest revving 125 I've heard.

Is it me or is that shift lever extremely high?

The '97 KX250 had such a good exhaust note. It barked, snarled and sounded so crisp. I rode one and the motor was so responsive and had so much torque. I loved that bike. I spent a decent amount of time on the '97 CR250 as well. That bike should be charged ... more »

The clamps on my '87 CR250 were clear coated from the factory. They also would clear coat the lower portion of the conventional forks as well back in the day.

I've heard plenty of 125's here in The States that barked. Listening to a PC 125 warm up on a nice summer morning at Unadilla back in the day is something I'll never forget.