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Yamaha MX & Off-Road Dirt Bikes
05 YZ250 Crank Seals
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[QUOTE="Bunya, post: 1229769, member: 77196"] Repeat the carb cleaner test and see if you get the same result. As we've been discussing in another thread, the open side of lip seals will seal better with pressure on that side. Your crankcase goes thru both positive and negative pressure cycles therefore your seals need to maintain a seal in both conditions. The leakdown test only tests for positive crankcase pressure, not negative, and the added 6 psi you're using is helping the seals to seal. If spraying carb cleaner behind the stator causes any noticeable change in the engine, the seal is leaking with negative crankcase pressure and needs to be changed. Although it might be minor enough that you're able to compensate the lean condition it's causing thru carb adjustments, it's only going to deteriorate over time risking a lot of engine damage. :yikes: [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
05 YZ250 Crank Seals
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