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Sm450R Added a reply to Does this sound normal? Rmz450
7/19/2026 5:22am Did not replace, cam chain wasn’t to worn so I didn’t replace it either…however I did buy a new one so I can replace it in a few more hours
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Sm450R Started a new thread Does this sound normal? Rmz450
7/18/2026 8:30pm Did a top end rebuild, new head, cams, prox steel valves, wiesco piston, and new cylinder. I checked the crank and there was no up and down play and very little side to side play. So I’m curious what could be making this engine so loud because it runs amazing and has zero metal in the oil (yes I checked...
This forum thread has 2 replies.
Sm450R Added a reply to YZ250 Cylinder porting
2/11/2026 5:46pm I know this is a very old forum but I have a PA ported cylinder but I can’t find jetting specs anywhere for the porting work. I have it very close to perfect but I wanna be sure going leaner won’t cause any harm.
Sm450R Added a reply to Will this frame hold up?
9/21/2025 3:11pm Yeah it’s clear of cracks, I’m planning to do hare-scrambles more than moto. Im supposed to be moving to B class In hare scrambles.
Sm450R Started a new thread Will this frame hold up?
9/21/2025 7:14am
This forum thread has 5 replies.
Sm450R Added a reply to What company engraves PA on cylinder?
9/20/2025 8:48pm Also that was and old pic, the carb isn’t that dirty when I put it on the bike, I fully soaked it and deep cleaned it.
Sm450R Added a reply to What company engraves PA on cylinder?
9/20/2025 8:47pm
Sm450R Started a new thread What company engraves PA on cylinder?
9/20/2025 6:41pm Been building a 05 yz250 build for a while now and I had been given a ported cylinder and carb with PA engravings, it runs and rips amazing but I’m curious who did the cylinder and carb work.
This forum thread has 4 replies.
Sm450R Added a reply to First time owning 250 2 stroke, dose this sound normal?
8/19/2025 4:26pm The motor was sadly not solid
Sm450R Started a new thread Rebuilding Yz250 top end but can’t figure out con rod brand
8/17/2025 9:54pm so just got curious and noticed my buddy’s yz250 hot rods rod seems a lot beefier than mine, can’t figure out what brand mine is, just wanna make sure it’s safe to run. Already went through and checked run outs and it’s well in spec, so just give me possible brands, thank you.
This forum thread has 1 reply.
Sm450R Added a reply to First time owning 250 2 stroke, dose this sound normal?
8/11/2025 3:10pm That upper pipe mount bolt was missing I got a new bolt in it, both mounts are good. It’s just missing an exhaust spring and bad orings, also just found a crack in the pipe that needs to be welded. Only like an inch crack.
Sm450R Added a reply to First time owning 250 2 stroke, dose this sound normal?
8/11/2025 12:03pm It’s good, I’ll probably pick up a new one from my local shop.
Sm450R Added a reply to First time owning 250 2 stroke, dose this sound normal?
8/11/2025 12:03pm I had just changed it to 180 because 178 had a hesitation getting into the power band. The 180 fixed that hesitation but the powerband seems short now
Sm450R Added a reply to First time owning 250 2 stroke, dose this sound normal?
8/11/2025 11:54am I Don’t have any of the nessasary tools to change the timing. I’m running 32:1 Formula K2 with 180 Main, 50 pilot, and 3 clip stock needle. At sea level, going to mainly be riding in weather from 30-80F.
Sm450R Added a reply to First time owning 250 2 stroke, dose this sound normal?
8/10/2025 9:04pm Thanks for the input, what would you say the cause of the white insulator but Black plug surface? It’s weird cause it’s really crisp with a clean transition from 1/4-1/2 throttle into the power band, but I noticed when full throttle the power seems a bit dull is the best way to put it, after just getting in the power...
Sm450R Started a new thread First time owning 250 2 stroke, dose this sound normal?
8/10/2025 5:16pm Bought this 2005 YZ250, fires up first kick every time, runs really good. This motor just sounds really loud, the guy did say it might need a top end soon. Also the bike runs really crisp has spooge coming out of the pipe, but when looking at the plug the insulator is white and the surface of the plug is...
This forum thread has 16 replies.
Sm450R Added a reply to 2 stroke oil preference and instructions
6/30/2025 9:38am I’ve got a question of my own, would k2 work fine for a 125 that gets a mix of woods and moto? I do ride the bike pretty hard, what would get me the most hours out the motor, I’d like to get 80 hours on a forged top ends.
Sm450R Added a reply to 927 VS K2 what’s better for a 125?
6/30/2025 9:35am 20 hours??? That’s crazy low hour for a forged piston.
Sm450R Added a reply to 927 VS K2 what’s better for a 125?
6/29/2025 10:35pm I do rings every 40 hours so that would allow me to clean up power valves
Sm450R Added a reply to 927 VS K2 what’s better for a 125?
6/29/2025 8:51pm I’ve done it many times with forged pistons. Never had a failure.