Husqvarna 445 down on power after spark plug change
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Thread: Husqvarna 445 down on power after spark plug change

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    Husqvarna 445 down on power after spark plug change

    I figured that since the 445 that I bought from Lowe's was now 7 years old, I should probably tune it up. I put on a new bar, air filter and changed the spark plug. I've recently been keeping the chain sharp too Thing is, after the plug swap it seems down on power. Before the changes, I could bury it in a cut and it would just muscle through it. With the new plug it bogs and I have to lift a little to let it recover. I put the old plug in and it runs great.

    The original plug was a Champion RC7JY and the new plug is an NGK BPMR7A. I cross referenced the plugs and that seems to check out. There is an Amazon review on this tune up kit that says "Saw worked great til I put in this plug. Not sure why.". Did I get a bad plug, or are NGK plugs not good?

    My only other experience with NGK plugs is in an 1/8 scale hydroplane and I'm wondering if I'm leaving power on the table there.

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    Quote Originally Posted by Bubber View Post
    I figured that since the 445 that I bought from Lowe's was now 7 years old, I should probably tune it up. I put on a new bar, air filter and changed the spark plug. I've recently been keeping the chain sharp too Thing is, after the plug swap it seems down on power. Before the changes, I could bury it in a cut and it would just muscle through it. With the new plug it bogs and I have to lift a little to let it recover. I put the old plug in and it runs great.

    The original plug was a Champion RC7JY and the new plug is an NGK BPMR7A. I cross referenced the plugs and that seems to check out. There is an Amazon review on this tune up kit that says "Saw worked great til I put in this plug. Not sure why.". Did I get a bad plug, or are NGK plugs not good?

    My only other experience with NGK plugs is in an 1/8 scale hydroplane and I'm wondering if I'm leaving power on the table there.

    Tried cross ref of RC7JY --no found results came up for a RCJ7Y

    When I looked up part for 445 saw it did come up with BPMR7A ,, my guess is a bad plug.

    Guessing both of them looked alike.
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    Typo... RCJ7Y

    Click image for larger version. 

Name:	qZOzZH7qUPwpJTGRAiLwI2M7krv081Refzj3R80I1go3EB0kwH2DNdTblgudgOrWTwH3xY3OnJxshwo_QPzIvacW8KAHwuvE.jpg 
Views:	3 
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ID:	533162

    They both looked the same.

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    Quote Originally Posted by Bubber View Post
    Typo... RCJ7Y

    Click image for larger version. 

Name:	qZOzZH7qUPwpJTGRAiLwI2M7krv081Refzj3R80I1go3EB0kwH2DNdTblgudgOrWTwH3xY3OnJxshwo_QPzIvacW8KAHwuvE.jpg 
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    They both looked the same.
    When I did the cross ref of the RCJ7Y NGK model you have was listed. maybe this one is either defective, a hotter or colder plug than OE.

    But when you look up 445 Hus saw the model plug you have is the replacement plug they suggest.

    So again guessing deft plug ,,since the OE plug works fine.
    Bubber and Yank like this.
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    We have a Red Honda Pioneer 700-4 (4 seater) w/soft top , doors, and winch.

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    Quote Originally Posted by etcallhome View Post
    When I did the cross ref of the RCJ7Y NGK model you have was listed. maybe this one is either defective, a hotter or colder plug than OE.

    But when you look up 445 Hus saw the model plug you have is the replacement plug they suggest.

    So again guessing deft plug ,,since the OE plug works fine.
    Thanks! I'm going to pick up a Champion plug for the saw and the boat. Although, if that boa get's any faster, I'm not sure it'll be a good thing.

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    Could an incorrectly gapped plug cause this?
    Yancey

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    Get the original. Although similar common specs, that doesn’t mean they work the same. Try oem and go from there.

    My lowes 445 got weak within a couple cord. I couldn’t sell it fast enough and get a used 346xp saw.

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