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Muffler Question re OS 120 AX

Old 06-29-2014, 03:21 PM
  #1  
Merlin Man
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Default Muffler Question re OS 120 AX

Hi All,
Has anyone used a inverted pitts style muffler on this motor?

Several years ago , I tried and ran into problems with backpressure ( lack of it ) using one of these mufflers. Could never tune the engine properly.

Are there people using them without problems ? What particular brand ?

Thanks
Cheers
Merlin Man.
Old 06-29-2014, 05:23 PM
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jymz
 
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I use the Slimline Q pitts on mine. Never any problems with it.
Old 06-29-2014, 10:32 PM
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Merlin Man
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Hi,
Maybe the inverted muffler is not called a pitts style. ? The slimline Q I just looked up is for a side mounted engine not an inverted engine?. I need the latter. Anyway, thanks for your reply.

Cheers,
Merlin Man.
Old 06-30-2014, 10:56 AM
  #4  
ameyam
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Check your tank location w.r.t the carb. OS 2c engines are very susceptible to being untunable when carb is below the tank centreline when inverted. Had a similar issue with a 75 ax some time back

Ameyam

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