stihl 028 wb

[mountaineer]

hey leewee, here's a good one-



 Quantum materiae materietur marmota monax si marmota monax materiam possit materiari?

[leweee]

  Andy....... had to Google that one......us beavers have a hard time keeping up with them Woodchucks.
Thanks for that one .

[mountaineer]

so i have my tach and i'm ready to go. kevin when you say under load do you mean while cutting? or just full throttle?

[leweee]

full throttle with bar and chain tensioned.....not in the wood.

[mountaineer]

 idle is 2930 and full throttle is 12540. i adjusted it first by following madsens carb tuning like you advised. now the taching. i did back the low down a little after i put the tach on but it seems to struggle a bit when i do so i put it back up to 2900's. i have not touched the high though. do yo think that 12540 is a good high end or should i adjust it to get max. an if i do that am i risking the engine?

[leweee]

if the chain stops traveling at that idle speed,and it preforms well in the wood you should be good to go.

[mountaineer]

to be honest leweee, i still think it bogs more easily than my wb does. would i need to get the rpms a little higher?

[leweee]

it also bogs when i give it full throttle.

This is a frequent problem on some Stihl saws (028, 038, MS380, MS381)that have the choke shutter in the air filter instead of in the carb.
This type of choke is held back by a spring.If the spring is weak or loose, when the engine is revved up, the higher air flow causes the shutter to go into the 'close' position.
In the worst cases it remains closed until the engine dies from flooding.
Usually it closes at full revs, opens as soon as the revs come down, and keeps doing this as long as you have the throttle fully pressed.
If you didn't know, the symptoms would make you suspect the ignition system.
The cure is simple.Either tighten the spring a bit or use the spring from your old filter, since it seems to work fine.

Joe
[/quote

when reving the saw ,watch the choke  flap to see any movement...

did you clean & rebuild the carb?....check fuel filter & line....impulse line from crankcase to carb.

[mountaineer]

it runs good,  just not what i thought it would be with the extra cc's. i don't think it's much more than some tweaking of the high jet.

[leweee]

when they were both new you would notice a bigger difference.

now that they are pensioners 4 or 5cc's isn't a biggy.