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Husqvarna 2100 thread

thedude74

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Looks like there's quite a bit of ignition timing adjustment due to the slotted screw holes... Where to set it?🤔
Final port timing numbers are 98.5, 120 and 75.
 

thedude74

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Well it runs....like crap😑

Ran good with no issues as 285.....
Acts kinda like an air leak....but it idles fine...has a weird mid range stutter that can't quite be tuned out....will rev out to 12,500 then acts like a limited coil... Saw a backfire on the intake side..
The rattle ball governor has been plugged.
Gaskets look good. Coil is advanced all the way. Maybe too much? Idk. Guess I'll pressure/ vac test the case when I have time.
IMG_20250406_173458260.jpg
 

hacskaroly

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Acts kinda like an air leak....but it idles fine...has a weird mid range stutter that can't quite be tuned out....will rev out to 12,500 then acts like a limited coil... Saw a backfire on the intake side..
On the 2100 there is a brace that holds up the carb and mounts to the case, I would imagine that this is due to how the carb is mounted and the weight of the air filter that (without the brace) could push down on the intake mount causing air to leak in.

1744043600699.png

1744043550472.png
 

hacskaroly

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Is that a 045 ignition???
It is a 285CD Bosch setup

 

thedude74

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On the 2100 there is a brace that holds up the carb and mounts to the case, I would imagine that this is due to how the carb is mounted and the weight of the air filter that (without the brace) could push down on the intake mount causing air to leak in.

View attachment 456064

View attachment 456062
Thanks! I'll have find or make a carb brace. Don't recall ever seeing one on the carb....Though it was likely removed previous to my ownership.
 

hacskaroly

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Its a pretty simple piece, at an angle with a bend at the carb, two screw holes (green arrow = brace, red boxes are the screws holding them in).

1744086888785.png
 
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