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Service & Maintenance Question

    Tom Christner
    I have a BT150 I received as a gift last year. This year it...
    Service & Maintenance Question posted November 27, 2015 by Tom Christner 
    119 Views, 3 Comments
    Question:
    I have a BT150 I received as a gift last year. This year it has started knocking, then will lose power. I removed the fuel and filled with fresh 91 oct gas and 2 cycle oil. It would run a few minutes then start knocking and lose power. I removed the spark plug and found a small carbon ball lodged in the plug. I cleaned plug and reinstalled. It ran for about 30 minutes then repeated what it had been doing. I installed a new plug and the same thing happens. Each time it has that carbon ball lodged in the plug gap. I ask a local lawn equipment repair shop about it and they said they've never seen that.

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    • Eugene Rounds

      Kinda suspect an incompatible oil problem. Not all 2 cycle oil are the same. I haven't seen the problem your describing but makes sense if the carbon is soft and bouncing in the cylinder.

      I had trimmers and blowers both having heavy carbon buildup from bad fuel oil being used. I had customers to switch brands and problems would go away. One customer was even using the fuel oil provide by Weedeater that was boxed with their new blower. After the installation of two piston sets he gave me the blower with I put in a third piston set and I have been using it for two plus years personally without problems.

      Currently what needs to done is a dis-assembly, complete cleaning of the piston, ring, and cylinder to remove all traces of the built up carbon, and re-assembly;.until this is done the problem will remain. After that mix a new container of fuel mix using a good pro multi mix fuel oil blend and use it after dumping the current fuel mix from the tank. I sell to my customers a Pro Multi Mix oil that can be used in any equipment needing 16:1 to 50:1 mixes

      I am an independent shop owner and not represent Husqvarna and the above is base on my personal experiences in my shop.

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      • Tom Christner
        Thanks for the respones. Since I posted the question I've read on a couple other forums where quite a few others were having the same problem with the knocking, which they're calling rattling. On those forums they were saying it was coming from carbon marbles rattling around, but it was normal for that blower. If that is true why are they not having the problem of those marbles lodging in the plug gap? Is my plug gapped wrong? I'm gapped at .025 as the manual calls for. Plug is NGK CMR7H.

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        • Eugene Rounds

          I had only blower in the shop that customer was complaining of knocking. Its problem was a failing spark plug at full throttle. It was the same CMR7H plug. I actually had several of these to fail this year.

          Manual indicates .025" plug gap.

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