Leak down test, seal the carb and pipe manifolds, find a screw in shrader valve for the plug, pump up to 10psi if it holds for a minute it's not an air leak. If it doesn't, spray soap and water mix at every rubber/paper part, you will need to drain the oil and water and remove rhs clutch cover, the Lhs ignition cover and magneto, do a 5 psi vacuum test as well.
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Oz
Current. 2015 ec300r estart, 98 RM 125
2013 Ec300r 2011 Ec300e 2009 Husky TE310
1982 XR500 Honda 1981 KE100 Kawasaki
1978 GT80 Yamaha
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