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CB200 carb issues

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Johnwebley:


  I am have problems trying to get my 200 to run above 6K,

basically the air cleaners are unavailable,the originals were caked with dirt,although the bike ran OK,it was rich at high revs.

 I tried to sort it by ripping out the card/fibre board ,replaced by foam,then the problems started,

seem to run ok below 6K,and small throttle opening,.

 using standard needle,if I lift it one groove,it runs rich low down,

 so I increased the MJ in various stages to 110,from 88,,but will not run at full throttle above 6k,or rev past 6k,

 still seems lean,

 any ideas?

I know it has a long inlet tract,how does this effect it?
I suspect it is the pulses,and pressure waves to help fill the cylinder,

K2-K6:
Long inlet tract is to harmonise at lower rpm to improve torque there.  Short inlet is usually focused at the screamer end of response.

That shouldn't have any affect on jetting from standard though as it obviously comes equipped in such a way.

Puzzled why it seems like it needs more fuel though.

Confident of ignition advance operating fully ? It'll not rev without that.

Johnwebley:
the advance seems ok
,seems ok,opens easily when twisted by hand


will check when the sun next shines

Oddjob:
Not exactly want you need to see John but.

https://classic-bikes.de/en/honda-luftfilter-satz-17200-354-005-3

Might solve the problem but bloody hell that's expensive.

Johnwebley:

--- Quote from: Oddjob on November 24, 2022, 10:19:45 PM ---Not exactly want you need to see John but.

https://classic-bikes.de/en/honda-luftfilter-satz-17200-354-005-3

Might solve the problem but bloody hell that's expensive.

--- End quote ---


Bloody hell,glad I amsitting!!!

looks like around £100 each plus VAT !!!!

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