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Suzuki MX & Off-Road Dirt Bikes
RM125 : Catastrophic Engine Failure(s) ... Please Help???
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[QUOTE="CarnageZ28, post: 1274917, member: 87235"] Oh, I understand where your coming from now. I thought you meant I was too rich with oil. I realize if it was jetted for 40:1 and then I ran 20:1 through it, there would be less gasoline for the same volume of fuel mixture being drawn through the carb, causing a lean condition. Previous owner told me he DID run it at 20:1 though. As for jetting, I am on the stock pilot jet, a clip richer on the needle jet, and a 340 main jet. Stock is a 330. I'm not saying your wrong, but none of the warning signs of detonation/lean mixture are there. Ceramic portion of the plug was correct color, plug looked good, no "burned" look to anything. Just kinda looks like you throw some chunks of iron/steel in the combustion chamber and let the piston go to town smashing them into the head/piston top. But anyways, that said, the ceramic portion of the plug is a brownish color, not wet, and certainly not whitish like it was detonating from a lean condition. The boot from the carb to the reed cage is new/not torn. Clamps were tight. And all new gaskets were used. Old gasket material was scraped clean with a razor. I really think somehow it was a bearing that just wasnt showing signs of wear? :bang: Or it did, and somehow I overlooked it, twice... I'll tell ya though, I feel pretty retarded at this point lol. And if anyone has a motor that will bolt in on a 91 RM125, I'm keeping my options open. Actually, I wonder how bad it would be to do a 250 swap if I got the carb, ignition, and pipe. I love how these 125's feel so if I could get that handling, with 250 power :p Anyone ever do something like this before? I imagine its not very common at all since most people just do sell bikes, but it has the potential to be a cool project. That or maybe a 144 big bore ... [/QUOTE]
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Suzuki MX & Off-Road Dirt Bikes
RM125 : Catastrophic Engine Failure(s) ... Please Help???
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