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Suzuki MX & Off-Road Dirt Bikes
Arghh! Cylinder/PV Trashed - Ideas???
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[QUOTE="Bunya, post: 1190692, member: 77196"] Picked up this 2000 RM250 a month ago. Of course I was told the top end was done recently. Without knowing where the top end was at I automatically ordered a piston & rings & a manual. The manual finally arrived so I tore it down today. I was shocked to see the condition of the top end. The piston has a lot of debris imbedded in the top of it. :yikes: The top of the head is pretty beat up as well. There's a couple of deep scores in the piston and the cylinder at the same spot. There appears to be a lot of slop in the main bearings so possibly one of the cages let loose which dumped all this metal. I haven't pulled the engine yet to find out. The really odd damage is to the top of the exhaust port and power valve. I've included some naked cylinder pictures so I won't have to type a thousand words. [IMG]http://i70.photobucket.com/albums/i89/RatGuru/RM%20Top%20End/RMCYL1.jpg[/IMG] Another look from the bottom up: [IMG]http://i70.photobucket.com/albums/i89/RatGuru/RM%20Top%20End/RMCYL3.jpg[/IMG] Here's the score in the cylinder: [IMG]http://i70.photobucket.com/albums/i89/RatGuru/RM%20Top%20End/RMCYL2.jpg[/IMG] And finally the piston: [IMG]http://i70.photobucket.com/albums/i89/RatGuru/RM%20Top%20End/RMPIST1.jpg[/IMG] First off, any ideas on what might have caused the damage to the exhaust port and valve? As you can see it's very deep on one side and tapers out towards the other. I don't see any damage to the piston in that area.!? I'll send the cylinder to US Chrome and get it repaired and plated, but what are my options for the power valve? Bandit lists a replacement at over $160 and I've already dumped way too much cash into this thing. Finally, with this much metal floating around, I'm going to have to deal with the bottom end. What's the best route on the crank - rebuild or replace? Who does good crank work or has decent pricing on complete units? Any help would be greatly appreciated! Marc - [/QUOTE]
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Suzuki MX & Off-Road Dirt Bikes
Arghh! Cylinder/PV Trashed - Ideas???
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