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Silencer de coke

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Silencer de coke

Post  banjo boy on Fri May 05, 2017 7:56 pm

Hi members
How often do you need to de coke silencer ? my bike is a model 87 engine was completely rebuilt approximately 650 miles ago running with silkoleen fully synthetic at 33:1 plug is clean not oily, today took bike for MOT but seemed a bit sluggish than normal, also tone of silencer sounded a little different,just shone a torch into silencer which did seem a bit coked but not that bad, if it does need doing what is the best and safest way many thanks in advance

Laurence
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banjo boy

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Silencer decoke

Post  FB vincent on Sun May 07, 2017 4:11 pm

In the early 1950's FB did have a problem with silencers which could not be dismantled, but by the time the AMC engines had been installed the Falcon and Cruiser silencers could be easily taken apart for cleaning. In the case of the Falcon 87, the exhaust passages are large and are very unlikely to become coked - the exhaust gas freedom probably in part results in the reputation for noise that these bikes have. However, you can easily check the narrowest part of these silencers, the longitudinal slot where the gases escape to the atmosphere (Don't tell the London mayor about this). It is just possible that ancient crud in the down pipe has become detached and is trapped here; a length of bent fencing wire will sort this out. Sandy

FB vincent

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Silencer

Post  kerabo on Sun May 07, 2017 6:38 pm

I would be very supprised if it's blocked epically are you using that oil. It's done nothing really with those few miles.
Mine 87 has done Nealy 5000 and is still clean mind you I make it work hard.

Regards Ken
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kerabo

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Location : Falcon 87. Trials 93 Special. Powerbike 56. Falcon 81 Green Lane bitsa. Sunbeam S8. Honda Deuville.

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Re: Silencer de coke

Post  banjo boy on Sun May 07, 2017 8:12 pm

Thank you Sandy and Ken for your replies, Sandy you are right about the slot and old crud, I decided to remove the silencer and a lot of decades of coke fell out and the slot was nearly completely blocked, I haven't been out for a test but did start the bike and it sounded much better and the throttle response was much  better too, Ken the rest of the pipe and baffle where very clean it was the first time I have removed the silencer since rebuild and the vibration Probably shook the old coke away. Thanks again Sandy and Ken for your help.

Laurence
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banjo boy

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