Hi all, my Tri-Z 250 seized up do to a center case air leak that was found, it did some damage to the lower part of the cylinder. I was going to get it bored out, is it okay to use it like this?
First Time Rider
Arm chair racerNew to the board
Hi all, my Tri-Z 250 seized up do to a center case air leak that was found, it did some damage to the lower part of the cylinder. I was going to get it bored out, is it okay to use it like this?
Power User
Roostin Away
I wouldn't, just on the off chance that it breaks off and does a ton of damage to your crank. re sleeving is expensive but worth it compared to what you might spend with it breaking off. also a new sleeve will bring you back to stock piston size that will allow for a longer life span of the motor
rectum nothin damn near killed them
feel free to leave feed back for me here. http://www.3wheelerworld.com/showthr...06#post1119306
Power User
The day begins with 3WW
I agree with Muthey^^^
Resleeve it or get a different cylinder.
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Registered User
New to the board
Tig it closed and file it. Magnaflux if youre skeered.
Power User
Catch me if you can
The stock liners in those engines were made as cheaply as possible. You can get a new LA Sleeve liner, labor and a fresh 68mm bore and a piston to match for about $400. In the long run it's cheaper that buying a used cylinder off eBay.
Got The Holeshot
Arm chair racerJust too addicted
Don't some of the big bore kits have that part of the cylinder removed ?.
YAMAHA 450 HYBRID
85 350X- RED
85 350x -BLACK
86 350x-WHITE (with Goki)
85 250r
83 atc 70
84 atc 70
84 atc 110
09 yfz 450
2006 Arctic Cat Prowler
RZR XP 900
First Time Rider
Arm chair racerNew to the board
Originally Posted by Maynard James
Yea I talked to the guy that is going to bore it out, he said he will just smooth it and it should be fine.
First Time Rider
Arm chair racerNew to the board
Any thoughts about the cylinder head? It took a pretty good beating. Not sure if this can be sanded out, or it would take too much off being how deep some of the nicks are. Im having trouble finding a nice head that is in good shape.
Power User
The day begins with 3WW
That dome needs recut, not sanded.
Find a reputable shop who does two strokes on the regular and ask for a quote to recut the head.
Deep dents, dings, gouges in the head can cause detonation
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Last edited by ironchop; 03-24-2020 at 01:03 PM.
First Time Rider
Arm chair racerNew to the board
Will the 85 YZ250 head work the same with a tri-z cylinder head gasket with no issues?
Power User
Catch me if you can
It will bolt to the cylinder and the gaskets are close, but the coolant spigots are in different spots, so no, the YZ doesn't work. Keep watching eBay, the Z heads come up regularly, you'll pay $50 to $100 for a nice one.
First Time Rider
Arm chair racerNew to the board
Oh ok I was wondering about that, yea I actually just bought a pretty nice Tri-Z head for $40 bucks earlier.
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