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Wanted - Stihl hs45 coil ( 4140 1308a) or complete HS45 I can strip

Posted by Darren Walters on March 26, 2013 at 3:34pm in Marketing
My old faithful HS45's started bogging down once warm last year and eventually became unusable. I've finally, finally got down to looking at them. Don't ask me why I didn't do it through the winter!So far I've replaced the plug, air filter, choke unit (it was iffy anyway), cleaned out the exhaust and today stripped down and cleaned the carb. They are still the same. Fine when cold but once warm, cut out as soon as you squeeze the throttle.The only thing left that I can think of is the coil, but at £60 I don't really want to buy a new one just in case it's not that either.Darren
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Replies

  • briggsandscrapem March 26, 2013 at 9:15pm

    I would try a known good carb first and check the fuel tank breather.

  • PRO
    Darren Walters March 26, 2013 at 9:29pm

    I have tried opening the cap once warm but it made no difference. I cleaned the carb quite thoroughly today and replaced the diaphragms and gaskets. It is absolutely fine when cold, just bogs down when warm. Perhaps I need to "borrow" a coil and a carb?

    Darren

    briggsandscrapem said:

    I would try a known good carb first and check the fuel tank breather.

  • Geoff Norfolk March 26, 2013 at 10:37pm

    When you say you cleaned the carb, did this include removing the metering needle (secured with a screw and a spring you have to be careful not to lose!), remove the mixture screws and then blow compressed air through the lot? It really does sound like a carb problem rather than the coil.

  • PRO
    Darren Walters March 27, 2013 at 6:36am
    Hi Geoff, I did remove the metering needle and another jet. I didn't remove the mixture screws or blow with compressed air. To be honest I thought the new diaphragms would do the trick as they looked past their best. Having said that, I still can't quite understand how it could be the carb if it is fine when cold? I know nothing about coils so I don't know how heat affects them, just going from info on the web.

    Darren



    Geoff Norfolk said:

    When you say you cleaned the carb, did this include removing the metering needle (secured with a screw and a spring you have to be careful not to lose!), remove the mixture screws and then blow compressed air through the lot? It really does sound like a carb problem rather than the coil.

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