Question about Husqvarna Saws
Had a complete rebuild was run with neat fuel. replaced pot and piston and replaced carb but it wont rev with throttle engaged and just bogs down. it ticks over but has the same bogging noise. ive replaced the fuel line and pickup filter to rectify any leaks and also went to the rouble of replacing the fuel cap as suggested and running it with fuel cap slightly open but with no luck replaced decomp and at this stage im totally lost ive must had ive done at of overhauls on saws but never come across this problem the crank was in good condition oil bearings and sealed gasket. where to go from here not sure tried rerplacing the carb with a known working one please help
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Posted on Jan 02, 2017
SOURCE: hello, i have a stihl ts400 and i just rebuilt the topend(crank,piston,cyl,all bearings and seals.Fires up easy, idles fine,revs fine, but when you hold the throttle down it doesent want to hit rev li
There is not an actual rev limiter. The top end is controlled by the carb. You actually want it to sound a bit rich at full throttle so that it has enough fuel when cutting under a load. What causes me some alarm is the revving up part. If it revs too fast that is a lean condition and can quickly ruin the piston and cylinder much like running straight gas. A torn intake boot can cause this. The high speed spec for the TS400 is 9,600 rpm + OR - 500 RPM. Your saw may not have a needle to adjust the high side as some have only the low speed adjuster. Also when you disassemble and clean the carb always use a new kit with the gaskets and diaphragm. Any Stihl dealer can furnish the kits and they aren't terribly expensive. Often between $10-20.
Posted on Aug 25, 2012
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