Backfire rebuilt Johnson 115 HP '83

boboat

Recruit
Joined
Jun 1, 2006
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5
I have fuly rebuilt mine V4 115 hp ''83 (started in 2000)
Put in oversized pistons new bearings seals and so on (a hell of a job)
Now it runs but gives a big spontanios backfire from exhaust in idle and half gas

-There are now plugwires crossed
-New coils and secondhand cdi unit's
-looked at flywheel key looks fine to me

Still the backfire

could this be the carbarateur?????
Or the ignition timing ??? have not set full advaced timing???

Need help from the experts Anyone idea's
I would like to go out boating with this baby here in the netherlands
 
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