TK carb. on line trimmer, can't adjust

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  #1  
Old 11-26-12, 12:31 AM
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Unhappy TK carb. on line trimmer, can't adjust

I have a 30 year old Kawasaki line trimmer, which is a great machine. However, I am having trouble with it's TK carburetor. I can't identify the carb. model, but have included a photo, which shows it's one and only mixture screw. Above the mixture screw is an idle stop screw.
The machine starts well, but I can't adjust for power at high revs. It appears to me (an amateur) to have good compression, as it turns over with quite a bit of resistance. I've found a little info on TK slide carb's, which mine is, ( http://golftechs.us/Manuals/shin%20trimmers.pdf )and so have checked the throttle needle for damage, also have tried moving the little clip on the needle from top position to centre, and back, with no obvious change.
One clue is that it runs best at backing the mixture screw off only one quarter of a turn. That seems too little to me by far.
 
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Old 11-26-12, 01:21 AM
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Have you disassembled and cleaned the carb and replaced the old internal gaskets and diaphragms?
 
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Old 11-26-12, 01:30 PM
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I have disassembled and cleaned, but I haven't replaced any as they still looked good. Maybe I should make that my next step.
 
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Old 11-26-12, 10:59 PM
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Does the diaphragm feel nice and soft, or does it feel a bit stiff and click when you push it in and out?
 
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Old 11-26-12, 11:51 PM
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It doesn't feel perfect; I'm not sure that it clicks, but it's fair to say that it's bagged a little, i.e. a little deformed. My problem in replacing it is that I first need to identify it. I've tried a couple of repair shops here, and they aren't interested. Perhaps if I was to dismantle it and take the parts in someone may recognize the parts. I see TK kits online, but of course I need to know the TK no. I'm in Australia, I don't know whether parts are more widely available in the U.S?
A couple more pics in case they help. The Shindaiwa pdf I linked to suggests that that the choke plate and lever indicate models, in my case it looks like a B-45, but I think that may be a machine model, rather than a carb. model.
 
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Old 11-27-12, 02:18 AM
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Since my previous post, I have ordered a kit from the U.S., just based on a photograph on Ebay. It's not expensive, but I guess I'll have to wait a couple of weeks to get it, based on previous experience. Cheers.
 
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